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Interest Rate Contracts (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Interest Rate Contracts [Abstract]    
Fair value derivatives, net liability position $ 98.9 $ 107.4
Reclassifcation from accumulated other comprehensive income (loss) to interest expense during the next 12 months $ 35.0