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Investments Offsetting for Derivatives and Securities Lending Balances (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Securities Lending [Abstract] |  |
Securities Loaned | $ 234.0 | $ 452.8
Securities Lending Agreements Offset in Balance Sheet | 0 | 0
Securities Lending Asset Offsets [Abstract] |  |
Securities Received as Collateral | 0 | 0
Cash collateral offset against securities purchased | 234.0 | 452.8
Net Exposure on Securities Purchased | 0 | 0
Securities Lending Liability Offsets [Abstract] |  |
Cash Collateral Pledged on Securities Lending Transactions | 0 | 0
Cash Collateral for Borrowed Securities | 236.3 | 455.8
Securities Lending Agreements, Net | 2.3 | 3.0
Derivative Assets [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | 62.1 | 81.6
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 62.1 | 81.6
Financial Instruments Pledged as Collateral from Counterparty | (53.6) | (72.9)
Derivative, Collateral, Obligation to Return Cash | 0 | 0
Derivative Asset, Fair Value, Net | 8.5 | 8.7
Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 157.4 | 170.5
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 157.4 | 170.5
Financial Instruments Pledged as Collateral to Counterparty | (117.7) | (129.8)
Derivative, Collateral, Right to Reclaim Cash | 1.8 | 1.8
Derivative Liability, Fair Value, Net | 37.9 | 38.9
Financial Assets [Abstract] |  |
Financial Assets Subject to Master Netting Arrangemetns Offset in the Balance Sheet | 0 | 0
Total Cash Received as Collateral from Contracts with Master Netting Arrangements | (234.0) | (452.8)
Financial Assets Subject to Master Netting Arrangements Presented in Balance Sheet | 296.1 | 534.4
Financial Assets Subject to Master Netting Arrangements, Gross | 296.1 | 534.4
Financial Assets Subject to Master Netting Arrangements, Net | 8.5 | 8.7
Total Financial Instruments Received as Collateral | (53.6) | (72.9)
Financial Liabilities [Abstract] |  |
Financial Liabilities Subject to Master Netting Arrangements, Gross | 393.7 | 626.3
Financial Liabilities Subject to Master Netting Arrangements Offset in the Balance Sheet | 0 | 0
Financial Liabilities Subject to Master Netting Arrangements Presented in Balance Sheet | 393.7 | 626.3
Total Financial Instruments Pledged as Collateral to Counterparty | (351.7) | (582.6)
Total Cash Pledged as Collateral on Contracts with Master Netting Arrangements | (1.8) | (1.8)
Financial Liabilities Subject to Master Netting Arrangements, Net | $ 40.2 | $ 41.9

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