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Investments Offsetting for Derivatives and Securities Lending Balances (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Offsetting Derivative Assets |  |
Gross Derivative Asset | $ 28.0 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 10.8 us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Liabilities Offsetting Derivative Assets in Balance Sheet | 0 us-gaap_DerivativeAssetFairValueGrossLiability | 0 us-gaap_DerivativeAssetFairValueGrossLiability
Net Derivative Assets Reported in Balance Sheet | 28.0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | 10.8 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Securities Received as Collateral on Derivative Assets | (7.2)us-gaap_DerivativeCollateralObligationToReturnSecurities | (9.5)us-gaap_DerivativeCollateralObligationToReturnSecurities
Cash collateral from counterparties | (15.4)us-gaap_DerivativeCollateralObligationToReturnCash | (1.1)us-gaap_DerivativeCollateralObligationToReturnCash
Derivative Assets Net of Collateral | 5.4 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral | 0.2 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Offsetting Securities Borrowed |  |
Gross Securities Borrowed | 176.5 us-gaap_SecuritiesBorrowedGross | 201.6 us-gaap_SecuritiesBorrowedGross
Liabilities Offsetting Securities Borrowed in Balance Sheet | 0 us-gaap_SecuritiesBorrowedLiability | 0 us-gaap_SecuritiesBorrowedLiability
Net Securities Borrowed Reported in Balance Sheet | 176.5 us-gaap_SecuritiesBorrowed | 201.6 us-gaap_SecuritiesBorrowed
Securities Received as Collateral on Securities Borrowed | (118.1)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities | (125.1)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities
Cash Received as Collateral on Securities Borrowed | (58.4)us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash | (76.5)us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash
Securities Borrowed Net of Collateral | 0 us-gaap_SecuritiesBorrowedAmountOffsetAgainstCollateral | 0 us-gaap_SecuritiesBorrowedAmountOffsetAgainstCollateral
Offsetting Financial Assets |  |
Gross Financial Assets | 204.5 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross | 212.4 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
Financial Liabilities Offsetting Financial Assets in Balance Sheet | 0 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability | 0 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
Net Financial Assets Reported in Balance Sheet | 204.5 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed | 212.4 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
Securities Received as Collateral on Financial Assets | (125.3)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities | (134.6)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities
Cash Received as Collateral on Financial Assets | (73.8)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash | (77.6)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
Financial Assets Net of Collateral | 5.4 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral | 0.2 us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
Offsetting Derivative Liabilities |  |
Gross Derivative Liability | 92.9 us-gaap_DerivativeFairValueOfDerivativeLiability | 135.6 us-gaap_DerivativeFairValueOfDerivativeLiability
Derivative Assets Offsetting Derivative Liabilities in Balance Sheet | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset | 0 us-gaap_DerivativeLiabilityFairValueGrossAsset
Net Derivative Liabilities Reported in Balance Sheet | 92.9 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | 135.6 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Securities Given as Collateral on Derivative Liabilities | (67.0)us-gaap_DerivativeCollateralRightToReclaimSecurities | (98.6)us-gaap_DerivativeCollateralRightToReclaimSecurities
Cash Collateral to counterparties | 0 us-gaap_DerivativeCollateralRightToReclaimCash | 0 us-gaap_DerivativeCollateralRightToReclaimCash
Derivative Liabilities Net of Collateral | 25.9 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral | 37.0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Offsetting Securities Loaned |  |
Gross Securities Loaned | 58.4 us-gaap_SecuritiesLoanedGross | 76.5 us-gaap_SecuritiesLoanedGross
Assets Offsetting Securities Loaned in Balance Sheet | 0 us-gaap_SecuritiesLoanedAsset | 0 us-gaap_SecuritiesLoanedAsset
Net Securities Loaned Reported in Balance Sheet | 58.4 us-gaap_SecuritiesLoaned | 76.5 us-gaap_SecuritiesLoaned
Securities Given as Collateral on Securities Loaned | (58.4)us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities | (76.5)us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities
Cash Given as Collateral on Securities Loaned | 0 us-gaap_SecuritiesLoanedCollateralRightToReclaimCash | 0 us-gaap_SecuritiesLoanedCollateralRightToReclaimCash
Securities Loaned Net of Collateral | 0 us-gaap_SecuritiesLoanedAmountOffsetAgainstCollateral | 0 us-gaap_SecuritiesLoanedAmountOffsetAgainstCollateral
Offsetting Financial Liabilities |  |
Gross Financial Liability | 151.3 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross | 212.1 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Financial Assets Offsetting Financial Liabilities in Balance Sheet | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Net Financial Liabilities Reported in Balance Sheet | 151.3 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned | 212.1 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
Securities Given as Collateral on Financial Liabilities | (125.4)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities | (175.1)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
Cash Given as Collateral on Financial Liabilities | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash | 0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
Financial Liabilities Net of Collateral | $ 25.9 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral | $ 37.0 us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral

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