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Fair Value of Financial Instrument (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 4.8 $ 11.3
Derivative liabilities 13.8 20.5
Long-term debt 297.4  
Trading securities 6.6  
5 7/8% Senior Notes due 2021    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 297.4 337.6
Long-term debt, carrying amount   300.0
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0.0 0.0
Derivative liabilities 0.0 0.0
Long-term debt 0.0  
Trading securities 0.0  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 4.8 11.3
Derivative liabilities 13.8 20.5
Long-term debt 297.4  
Trading securities 6.6  
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0.0 0.0
Derivative liabilities 0.0 $ 0.0
Long-term debt 0.0  
Trading securities $ 0.0