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Derivative Financial Instruments (Details) (Cash Flow Hedges [Member], Interest rate swaps [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Cash Flow Hedges [Member] | Interest rate swaps [Member]
       
Summary of the location and amount of derivative instrument gains and losses (before taxes) reported in the Consolidated Statements of Income        
Amount of Gain (Loss) Recognized in Other Comprehensive Income $ 0 $ (0.5) $ 1.3 $ (1.4)