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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value $ 9.1 $ 11.3
Derivative liability, fair value 10.7 20.5
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 336.0 337.6
Long-term debt $ 300.0 $ 300.0