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Derivative Financial Instruments (Details) - Foreign Currency Forward Contract
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
instrument
Derivative Instruments, Gain (Loss) [Line Items]    
Number of contracts outstanding | instrument   0
Affiliate Partners    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains realized upon settlement of foreign currency forward contracts $ 0.2 $ 3.2
Losses realized upon settlement of foreign currency forward contract on Derivative 1.2 $ 1.7
Unrealized gains related to outstanding foreign currency contracts 0.6  
Unrealized losses related to outstanding foreign currency contracts $ 0.5