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Derivative Financial Instruments Offsetting Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Offsetting Derivative Liabilities [Abstract]
Derivative Liability Collateral	$ 0	$ 0
Gross Amount Recognized	181.4	61.5
Gross Amounts Not Offset Permitted Under Master Netting Agreements	(161.5)	(47.1)
Net Amount	$ 19.9	$ 14.4

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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