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Equity Method Investments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]      
Unamortized basis differences included in equity investments $ 29.8   $ 30.9
Amortization Expense (Income) $ 0.7 $ 0.3