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Schedule II. Condensed Financial Information Of Registrant (Balance Sheets Parenthetical) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Preference Shares, Par Value (In dollars per share)	$ 1us-gaap_PreferredStockParOrStatedValuePerShare	$ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preference Shares, Shares issued (In shares)	16,000,000us-gaap_PreferredStockSharesIssued	16,000,000us-gaap_PreferredStockSharesIssued
Preference shares, Shares outstanding (In shares)	16,000,000us-gaap_PreferredStockSharesOutstanding	16,000,000us-gaap_PreferredStockSharesOutstanding
Common Shares, Par Value (In dollars per share)	$ 1us-gaap_CommonStockParOrStatedValuePerShare	$ 1us-gaap_CommonStockParOrStatedValuePerShare
Common Shares, Shares issued (In shares)	38,441,972us-gaap_CommonStockSharesIssued	43,646,436us-gaap_CommonStockSharesIssued
Common Shares, Shares outstanding (In shares)	38,441,972us-gaap_CommonStockSharesOutstanding	43,646,436us-gaap_CommonStockSharesOutstanding
Parent Company
Condensed Financial Statements, Captions [Line Items]
Preference Shares, Par Value (In dollars per share)	$ 1.00us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 1.00us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preference Shares, Shares issued (In shares)	16,000,000us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	16,000,000us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preference shares, Shares outstanding (In shares)	16,000,000us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	16,000,000us-gaap_PreferredStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common Shares, Par Value (In dollars per share)	$ 1.00us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 1.00us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common Shares, Shares issued (In shares)	38,441,972us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	43,646,436us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common Shares, Shares outstanding (In shares)	38,441,972us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	43,646,436us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

X

- Definition

Face amount or stated value per share of common stock.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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