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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value $ 7.0 $ 4.8
Derivative liability, fair value 12.5 13.8
Long-term debt, fair value   297.4
Trading securities   6.6
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, fair value 7.0 4.8
Derivative liability, fair value $ 12.5 13.8
Long-term debt, fair value   297.4
Trading securities   $ 6.6