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Derivative Financial Instruments (Details 4) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2016
Derivative [Line Items]          
Long-term Line of Credit $ 86.3   $ 86.3   $ 105.0
Net gain (loss) 0.2 $ (3.0) $ (7.3) $ (4.1)  
Interest Income, Other $ 0.5