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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Market Based Derivative      
Derivative Instruments, Gain (Loss) [Line Items]      
Recognized expense on derivative $ 2.5    
Affiliated Entity | Foreign Currency Forward Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains realized upon settlement of foreign currency forward contracts   $ 1.6 $ 0.2
Losses realized upon settlement of foreign currency forward contract on Derivative   2.2 1.2
Unrealized gains related to outstanding foreign currency contracts   0.2 0.6
Unrealized losses related to outstanding foreign currency contracts   $ 0.6 $ 0.5