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Derivative Instruments And Hedging Activities (Fair Value Of Derivative Financial Instruments And Their Classification In The Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative Asset, Fair Value	$ 0	$ 0.1
Derivatives Not Designated As Hedging Instruments [Member] \| Interest Rate Cap [Member]
Derivative Asset, Fair Value	0	0.1
Derivatives Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Derivative Liability, Fair Value	$ 11.6	$ 16.6

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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- Definition

Fair value of derivative liability, 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.

+ References+ Details