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Cover
Document and Entity Information
Financial Statements
CONSOLIDATED BALANCE SHEETS
CONSOLIDATED BALANCE SHEETS (Parenthetical)
CONSOLIDATED STATEMENTS OF OPERATIONS
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
CONSOLIDATED STATEMENTS OF EQUITY
CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)
CONSOLIDATED STATEMENTS OF CASH FLOWS
Notes to Financial Statements
Summary of Significant Accounting Policies
Acquisitions, Divestitures and Deconsolidation
Investments
Fair Value
Receivables
Property, Plant and Equipment
Goodwill and Other Intangible Assets
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves
Leases
Income Taxes
Debt
Shareholders' Equity
Revenue from Contracts with Customers
Statutory Accounting Practices
Benefit Plans
Reinsurance
Quarterly Financial Data (Unaudited)
Legal Proceedings
Commitments and Contingencies
Segments
Subsequent Event
Other
Schedule I - Condensed Financial Information of Registrant
Schedule V - Supplemental Information Concerning Property and Casualty Insurance Operations
Accounting Policies
Summary of Significant Accounting Policies (Policies)
Notes Tables
Summary of Significant Accounting Policies (Tables)
Investments (Tables)
Fair Value (Tables)
Receivables (Tables)
Property, Plant and Equipment (Tables)
Goodwill and Other Intangible Assets (Tables)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves (Tables)
Leases (Tables)
Income Taxes (Tables)
Debt (Tables)
Shareholders' Equity (Tables)
Revenue from Contracts with Customers (Tables)
Statutory Accounting Practices (Tables)
Benefit Plans (Tables)
Reinsurance (Tables)
Quarterly Financial Data (Unaudited) (Tables)
Segments (Tables)
Notes Details
Summary of Significant Accounting Policies, Basis of Presentation (Details)
Summary of Significant Accounting Policies, Principles of Consolidation (Details)
Summary of Significant Accounting Policies, Investments (Details)
Summary of Significant Accounting Policies, Credit Losses (Details)
Summary of Significant Accounting Policies, Joint Venture Investments (Details)
Summary of Significant Accounting Policies, Securities Lending Activities (Details)
Summary of Significant Accounting Policies, Revenue Recognition (Details)
Summary of Significant Accounting Policies, Claim and Claim Adjustment Expense Reserves (Details)
Summary of Significant Accounting Policies, Future Policy Benefit Reserves (Details)
Summary of Significant Accounting Policies, Insurance-related Assessments (Details)
Summary of Significant Accounting Policies, Reinsurance (Details)
Summary of Significant Accounting Policies, Policyholder Dividends (Details)
Summary of Significant Accounting Policies, Property, Plant and Equipment (Details)
Summary of Significant Accounting Policies, Stock-based Compensation (Details)
Summary of Significant Accounting Policies, Net Income per Share (Details)
Summary of Significant Accounting Policies, Foreign Currency (Details)
Summary of Significant Accounting Policies, Supplementary Cash Flow Information (Details)
Summary of Significant Accounting Policies, Accounting Changes (Details)
Acquisitions, Divestitures and Deconsolidation (Details)
Investments, Net Investment Income (Details)
Investments, Investment Gains (Losses) (Details)
Investments, Allowance for Credit Losses (Details)
Investments, Available-for-sale Impairment Losses Recognized in Earnings (Details)
Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details)
Investments, Available-for-sale Securities in Gross Unrealized Loss Position (Details)
Investments, Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details)
Investments, Limited Partnerships (Details)
Investments, Amortized Cost Basis of Mortgage Loans for Each Credit Quality Indicator by Year of Origination (Details)
Investments, Aggregate Contractual or Notional Amounts and Estimated Fair Values Related to Derivative Financial Instruments (Details)
Investments, Investment Commitments (Details)
Investments, Investments on Deposit (Details)
Fair Value, Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)
Fair Value, Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details)
Fair Value, Significant Unobservable Inputs (Details)
Fair Value, Financial Assets and Liabilities Not Measured at Fair Value (Details)
Receivables (Details)
Property, Plant and Equipment, Components of Property, Plant and Equipment (Details)
Property, Plant and Equipment, Depreciation Expense and Capital Expenditures (Details)
Property, Plant and Equipment, Asset Impairments (Details)
Goodwill and Other Intangible Assets, Goodwill (Details)
Goodwill and Other Intangible Assets, Other Intangible Assets (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Net Liability for Unpaid Claim and Claim Adjustment Expenses (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Reconciliation of Claim and Claim Adjustment Expense Reserves (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Gross and Net Carried Reserves (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Net Prior Year Loss Reserve Development in Property and Casualty Operations (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Net Liability for Unpaid Claims and Claims Adjustment Expenses by Line of Business (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Medical Professional Liability (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Other Professional Liability and Management Liability (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Surety (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Commercial Auto (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, General Liability (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Workers' Compensation (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Supplementary Information about Average Historical Claims Duration (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, A&EP Reserves (Details)
Claim, Claim Adjustment Expense and Future Policy Benefit Reserves, Life and Group Policyholder Reserves (Details)
Leases (Details)
Income Taxes, Current and Deferred Components of Income Tax Expense (Benefit) (Details)
Income Taxes, Reconciliation between Federal Income Tax Expense at Statutory Rates and Actual Income Tax Expense (Benefit) (Details)
Income Taxes, Unrecognized Tax Benefits (Details)
Income Taxes, Deferred Tax Assets and Liabilities (Details)
Income Taxes, Operating Loss and Tax Credit Carryforwards (Details)
Debt, Long-term Debt (Details)
Debt, Summary of Long-term Debt (Details)
Debt, Debt Maturities (Details)
Debt, Activity (Details)
Shareholders' Equity, Components of Accumulated Other Comprehensive Income (Details)
Shareholders' Equity, Common Stock Dividends and Treasury Stock (Details)
Revenue from Contracts with Customers (Details)
Statutory Accounting Practices (Details)
Benefit Plans, Weighted Average Assumptions Used to Determine Benefit Obligations (Details)
Benefit Plans, Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)
Benefit Plans, Assumed Health Care Cost Trend Rates (Details)
Benefit Plans, Components of Net Periodic Benefit Cost (Details)
Benefit Plans, Reconciliation of Benefit Obligations and Plan Assets (Details)
Benefit Plans, Amounts Recognized in the Consolidated Balance Sheets (Details)
Benefit Plans, Amounts Not Yet Recognized in Net Periodic (Benefit) Cost (Details)
Benefit Plans, Plans With Projected and Accumulated Benefit Obligations in Excess of Plan Assets (Details)
Benefit Plans, Estimated Future Minimum Benefit Payments (Details)
Benefit Plans, Pension Plan Assets Measured at Fair Value on Recurring Basis (Details)
Benefit Plans, Other Postretirement Benefit Plan Assets Measured at Fair Value on Recurring Basis (Details)
Benefit Plans, Savings Plans and Stock-based Compensation (Details)
Reinsurance, Receivables from Reinsurers (Details)
Reinsurance, Voluntary Reinsurance Receivables by Financial Strength (Details)
Reinsurance, Effects of Reinsurance on Earned Premiums (Details)
Quarterly Financial Data (Unaudited) (Details)
Commitments and Contingencies (Details)
Segments (Details)
Subsequent Event (Details)
Schedule I - Condensed Financial Information of Registrant, Balance Sheets (Details)
Schedule I - Condensed Financial Information of Registrant, Statements of Operations and Comprehensive Income (Loss) (Details)
Schedule I - Condensed Financial Information of Registrant, Statements of Cash Flows (Details)
Schedule V - Supplemental Information Concerning Property and Casualty Insurance Operations (Details)
All Reports