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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value $ 7.6 $ 11.3
Derivative liability, fair value 16.2 20.5
Long-term debt, fair value 301.6  
Trading securities 5.4  
5 7/8% Senior Notes due 2021 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, fair value 301.6 337.6
Long-term debt 300.0 300.0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value 7.6 11.3
Derivative liability, fair value 16.2 $ 20.5
Long-term debt, fair value 301.6  
Trading securities $ 5.4