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Disclosure - Derivative contracts link:calculationLink link:presentationLink link:definitionLink 1020 - Disclosure - Supplemental cash flow information link:calculationLink link:presentationLink link:definitionLink 1021 - Disclosure - Unpaid losses and loss adjustment expenses link:calculationLink link:presentationLink link:definitionLink 1022 - Disclosure - Notes payable and other borrowings link:calculationLink link:presentationLink link:definitionLink 1023 - Disclosure - Income taxes link:calculationLink link:presentationLink link:definitionLink 1024 - Disclosure - Dividend restrictions - Insurance subsidiaries link:calculationLink link:presentationLink link:definitionLink 1025 - Disclosure - Fair value measurements link:calculationLink link:presentationLink link:definitionLink 1026 - Disclosure - Common stock link:calculationLink link:presentationLink link:definitionLink 1027 - Disclosure - Pension plans link:calculationLink link:presentationLink link:definitionLink 1028 - Disclosure - Contingencies and Commitments link:calculationLink link:presentationLink link:definitionLink 1029 - Disclosure - Business segment data link:calculationLink link:presentationLink link:definitionLink 1030 - Disclosure - Quarterly data link:calculationLink link:presentationLink link:definitionLink 1031 - Disclosure - Condensed Financial Information link:calculationLink link:presentationLink link:definitionLink 1032 - Disclosure - Significant accounting policies and practices (Policies) link:calculationLink link:presentationLink link:definitionLink 1033 - Disclosure - Significant business acquisitions (Tables) link:calculationLink link:presentationLink link:definitionLink 1034 - Disclosure - Investments in fixed maturity securities (Tables) link:calculationLink link:presentationLink link:definitionLink 1035 - Disclosure - Investments in equity securities (Tables) link:calculationLink link:presentationLink link:definitionLink 1036 - Disclosure - Other investments (Tables) link:calculationLink link:presentationLink link:definitionLink 1037 - Disclosure - Investment gains/losses and other-than-temporary investment losses (Tables) link:calculationLink link:presentationLink link:definitionLink 1038 - Disclosure - Receivables (Tables) link:calculationLink link:presentationLink link:definitionLink 1039 - Disclosure - Inventories (Tables) link:calculationLink link:presentationLink link:definitionLink 1040 - Disclosure - Goodwill and other intangible assets (Tables) link:calculationLink link:presentationLink link:definitionLink 1041 - Disclosure - Property, plant and equipment (Tables) link:calculationLink link:presentationLink link:definitionLink 1042 - Disclosure - Derivative contracts (Tables) link:calculationLink link:presentationLink link:definitionLink 1043 - Disclosure - Supplemental cash flow information (Tables) link:calculationLink link:presentationLink link:definitionLink 1044 - Disclosure - Unpaid losses and loss adjustment expenses (Tables) link:calculationLink link:presentationLink link:definitionLink 1045 - Disclosure - Notes payable and other borrowings (Tables) link:calculationLink link:presentationLink link:definitionLink 1046 - Disclosure - Income taxes (Tables) link:calculationLink link:presentationLink link:definitionLink 1047 - Disclosure - Fair value measurements (Tables) link:calculationLink link:presentationLink link:definitionLink 1048 - Disclosure - Common stock (Tables) link:calculationLink link:presentationLink link:definitionLink 1049 - Disclosure - Pension plans (Tables) link:calculationLink link:presentationLink link:definitionLink 1050 - Disclosure - Contingencies and Commitments (Tables) link:calculationLink link:presentationLink link:definitionLink 1051 - Disclosure - Business segment data (Tables) link:calculationLink link:presentationLink link:definitionLink 1052 - Disclosure - Quarterly data (Tables) link:calculationLink link:presentationLink link:definitionLink 1053 - Disclosure - Significant Accounting Policies - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1054 - Disclosure - Significant Business Acquisitions - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1055 - Disclosure - Significant Business Acquisitions - Lubrizol (Detail) link:calculationLink link:presentationLink link:definitionLink 1056 - Disclosure - Investments in fixed maturity securities (Detail) link:calculationLink link:presentationLink link:definitionLink 1057 - Disclosure - Investments in fixed maturity securities - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1058 - Disclosure - Investments in fixed maturity securities - Amortized cost and estimated fair value of securities with fixed maturities (Detail) link:calculationLink link:presentationLink link:definitionLink 1059 - Disclosure - Investments in equity securities (Detail) link:calculationLink link:presentationLink link:definitionLink 1060 - Disclosure - Investments in equity securities - Fair value by segment (Detail) link:calculationLink link:presentationLink link:definitionLink 1061 - Disclosure - Investments in equity securities - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1062 - Disclosure - Other investments (Detail) link:calculationLink link:presentationLink link:definitionLink 1063 - Disclosure - Other investments - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1064 - Disclosure - Investment gains/losses and other-than-temporary investment losses (Detail) link:calculationLink link:presentationLink link:definitionLink 1065 - Disclosure - Investment gains/losses and other-than-temporary impairment losses - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1066 - Disclosure - Investment gains/losses and other-than-temporary impairment losses - Other-than-temporary impairment losses (Detail) link:calculationLink link:presentationLink link:definitionLink 1067 - Disclosure - Receivables (Detail) link:calculationLink link:presentationLink link:definitionLink 1068 - Disclosure - Receivables - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1069 - Disclosure - Inventories (Detail) link:calculationLink link:presentationLink link:definitionLink 1070 - Disclosure - Goodwill and other intangible assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1071 - Disclosure - Goodwill and other intangible assets - Intangible assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1072 - Disclosure - Goodwill and other intangible assets - Intangible assets - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1073 - Disclosure - Property, plant and equipment (Detail) link:calculationLink link:presentationLink link:definitionLink 1074 - Disclosure - Property, plant and equipment - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1075 - Disclosure - Derivative contracts (Detail) link:calculationLink link:presentationLink link:definitionLink 1076 - Disclosure - Derivative contracts - gains and losses (Detail) link:calculationLink link:presentationLink link:definitionLink 1077 - Disclosure - Derivative contracts - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1078 - Disclosure - Supplemental cash flow information (Detail) link:calculationLink link:presentationLink link:definitionLink 1079 - Disclosure - Unpaid losses and loss adjustment expenses (Detail) link:calculationLink link:presentationLink link:definitionLink 1080 - Disclosure - Unpaid losses and loss adjustment expenses - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1081 - Disclosure - Notes payable and other borrowings (Detail) link:calculationLink link:presentationLink link:definitionLink 1082 - Disclosure - Notes payable and other borrowings - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1083 - Disclosure - Income taxes - Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1084 - Disclosure - Income taxes - Deferred taxes (Detail) link:calculationLink link:presentationLink link:definitionLink 1085 - Disclosure - Income taxes - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1086 - Disclosure - Income taxes - Income tax expense components (Detail) link:calculationLink link:presentationLink link:definitionLink 1087 - Disclosure - Income taxes - Income tax expense reconciliation (Detail) link:calculationLink link:presentationLink link:definitionLink 1088 - Disclosure - Dividend restrictions - Insurance subsidiaries (Detail) link:calculationLink link:presentationLink link:definitionLink 1089 - Disclosure - Fair value measurements - Financial Instruments (Detail) link:calculationLink link:presentationLink link:definitionLink 1090 - Disclosure - Fair value measurements - Financial assets and liabilities measured and carried at fair value on a recurring basis (Detail) link:calculationLink link:presentationLink link:definitionLink 1091 - Disclosure - Fair value measurements - Significant unobservable inputs (Detail) link:calculationLink link:presentationLink link:definitionLink 1092 - Disclosure - Common stock (Detail) link:calculationLink link:presentationLink link:definitionLink 1093 - Disclosure - Common stock (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1094 - Disclosure - Common stock - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1095 - Disclosure - Pension plans - Net periodic pension expense (Detail) link:calculationLink link:presentationLink link:definitionLink 1096 - Disclosure - Pension plans - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1097 - Disclosure - Pension plans- Projected benefit obligation roll-forward (Detail) link:calculationLink link:presentationLink link:definitionLink 1098 - Disclosure - Pension plans - Plan assets roll-forward (Detail) link:calculationLink link:presentationLink link:definitionLink 1099 - Disclosure - Pension plans - Fair value of plan assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1100 - Disclosure - Pension plans - Additional tabular disclosures (Detail) link:calculationLink link:presentationLink link:definitionLink 1101 - Disclosure - Pension plans - Narrative 2 (Detail) link:calculationLink link:presentationLink link:definitionLink 1102 - Disclosure - Contingencies and Commitments - Commitments - Narrative (Detail) link:calculationLink link:presentationLink link:definitionLink 1103 - Disclosure - Contingencies and Commitments - Operating leases minimum payments (Detail) link:calculationLink link:presentationLink link:definitionLink 1104 - Disclosure - Business segment data (Detail) link:calculationLink link:presentationLink link:definitionLink 1105 - Disclosure - Business Segment Data - Insurance premiums by geographic area (Detail) link:calculationLink link:presentationLink link:definitionLink 1106 - Disclosure - Business Segment Data - 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