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Equity Method Investments in Affiliates - Change in Equity Method Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Change in Equity Method Investments in Affiliates [Roll Forward]    
Balance, as of December 31, 2017 $ 3,304.7  
Distributions of earnings from equity method investments (225.7) $ (189.9)
Balance, as of March 31, 2018 3,177.0  
Equity Method Investee    
Change in Equity Method Investments in Affiliates [Roll Forward]    
Balance, as of December 31, 2017 3,304.7  
Equity method earnings 126.3  
Equity method intangible amortization (30.0)  
Distributions of earnings from equity method investments (225.7)  
Foreign currency translation 11.6  
Other (9.9)  
Balance, as of March 31, 2018 $ 3,177.0