00100 - Statement - Consolidated Balance Sheets (Alternate) link:presentationLink link:calculationLink link:definitionLink 00250 - Statement - Consolidated Statements Of Operations And Comprehensive Income (Loss) (Alternate) link:presentationLink link:calculationLink link:definitionLink 00400 - Statement - Consolidated Statements Of Cash Flows (Alternate) link:presentationLink link:calculationLink link:definitionLink 40302 - Disclosure - Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) link:presentationLink link:calculationLink link:definitionLink 40305 - Disclosure - Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) link:presentationLink link:calculationLink link:definitionLink 40306 - Disclosure - Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (Details) link:presentationLink link:calculationLink link:definitionLink 40308 - Disclosure - Investments (Summary Of Components Of Net Investment Income) (Details) link:presentationLink link:calculationLink link:definitionLink 40802 - Disclosure - Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) link:presentationLink link:calculationLink link:definitionLink 41001 - Disclosure - Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) link:presentationLink link:calculationLink link:definitionLink 41003 - Disclosure - Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) link:presentationLink link:calculationLink link:definitionLink 41501 - Disclosure - Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) link:presentationLink link:calculationLink link:definitionLink 41502 - Disclosure - Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) link:presentationLink link:calculationLink link:definitionLink 41701 - Disclosure - Retirement Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document And Entity Information link:presentationLink link:calculationLink link:definitionLink 00100 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 00105 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00200 - Statement - Consolidated Statements Of Operations And Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 00300 - Statement - Consolidated Statements Of Changes In Shareholders' Equity link:presentationLink link:calculationLink link:definitionLink 00305 - Statement - Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00400 - Statement - Consolidated Statements Of Cash Flows link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - General link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - Basis Of Presentation link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - Derivatives link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - Fair Value link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - Redeemable Noncontrolling Interests - MT. Logan RE link:presentationLink link:calculationLink link:definitionLink 10701 - Disclosure - Capital Transactions link:presentationLink link:calculationLink link:definitionLink 10801 - Disclosure - Earnings Per Common Share link:presentationLink link:calculationLink link:definitionLink 10901 - Disclosure - Contingencies link:presentationLink link:calculationLink link:definitionLink 11001 - Disclosure - Other Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 11101 - Disclosure - Credit Facilities link:presentationLink link:calculationLink link:definitionLink 11201 - Disclosure - Reinsurance And Trust Agreements link:presentationLink link:calculationLink link:definitionLink 11301 - Disclosure - Senior Notes link:presentationLink link:calculationLink link:definitionLink 11401 - Disclosure - Long Term Subordinated Notes link:presentationLink link:calculationLink link:definitionLink 11501 - Disclosure - Segment Reporting link:presentationLink link:calculationLink link:definitionLink 11601 - Disclosure - Share-Based Compensation Plans link:presentationLink link:calculationLink link:definitionLink 11701 - Disclosure - Retirement Benefits link:presentationLink link:calculationLink link:definitionLink 11801 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 11901 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 30303 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 30403 - Disclosure - Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - Fair Value (Tables) link:presentationLink link:calculationLink link:definitionLink 30603 - Disclosure - Redeemable Noncontrolling Interests - MT. 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Logan RE (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 40602 - Disclosure - Redeemable Noncontrolling Interests - MT. 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