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Derivative Financial Instruments and Hedging Activities - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ 10.0 $ 16.1
Other Comprehensive Income (Loss), Tax $ 0.6 $ 6.1