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Equity Method Investments in Affiliates - Change in Equity Method Investments (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 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 (327.8) $ (283.5)
Balance, as of June 30, 2018 3,134.0  
Equity Method Investee    
Change in Equity Method Investments in Affiliates [Roll Forward]    
Balance, as of December 31, 2017 3,304.7  
Equity method earnings 218.4  
Equity method intangible amortization and impairments (86.8)  
Distributions of earnings from equity method investments (327.8)  
Foreign currency translation 31.3  
Other (5.8)  
Balance, as of June 30, 2018 $ 3,134.0