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Debt (Details 6) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Future maturities of long-term debt    
Year 1: Long-term debt maturities $ 0.3  
Year 2: Long-term debt maturities 5.3  
Year 4: Long-term debt maturities 299.8  
Year 6 and thereafter: Long-term debt maturities 2,296.0  
Long-term debt $ 2,601.4 $ 2,671.3