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Derivative Financial Instruments Offsetting Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Offsetting Assets [Abstract]
Derivative Assets Collateral	$ 0	$ 0
Gross Amount Recognized	140.4	82.6
Gross Amounts Not Offset Permitted Under Master Netting Agreements	(123.0)	(47.1)
Net Amount	$ 17.4	$ 35.5

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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