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Derivative Financial Instruments Derivative Instruments (Offsetting Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Derivative Liabilities [Abstract]
Gross Amount Recognized	$ 450.4	$ 218.4
Gross Amounts Not Offset Permitted Under Master Netting Agreements	(321.5)	(198.5)
Net Amount	$ 128.9us-gaap_DerivativeLiabilities	$ 19.9us-gaap_DerivativeLiabilities

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 liabilities not subject to a master netting arrangement and not elected to be offset.

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