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Long-Term Debt (Details 4) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest expense
       
Effect of derivative instruments        
Amount of loss reclassified from AOCE into income $ (1.2) $ (1.8) $ (4.2) $ (5.8)
Interest rate swap contracts
       
Effect of derivative instruments        
Amount of gain (loss) recognized in AOCE on derivatives $ (3.5) $ (6.0) $ 1.3 $ (10.6)