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Derivative Instruments (Effect of Derivative Instruments on the Statements of Income and Shareholders' Equity) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ 128.8 $ (25.3) $ 0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax (1.6) (1.1) (0.8)
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ 0 $ (0.1) $ (0.1)