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Derivative Financial Instruments - Credit Default Swaps (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative assets	$ 512.7	$ 446.6
Derivatives liabilities	346.8	360.1
Credit contracts \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Maximum potential future net exposure on sale of credit default swaps	329.0	518.3
Credit contracts \| Not Designated as Hedging Instrument \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	3.6	2.6
Derivatives liabilities	$ 0	$ 21.2

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Maximum amount the entity would be obligated to pay on the credit risk derivatives upon occurrence of a credit event.

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