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Redeemable Non-Controlling Interests (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in redeemable non-controlling interests during the period      
Balance, as of January 1, $ 673.5 $ 612.5  
Changes attributable to consolidated products 12.4 16.1  
Transfers to Other liabilities (192.3) (69.1)  
Transfers from non-controlling interests 76.8 42.6  
Changes in redemption value 241.5 71.4 $ 81.6
Balance, as of December 31, $ 811.9 $ 673.5 $ 612.5
Minimum      
Noncontrolling Interest [Line Items]      
Term of conditional right put interest 5 years    
Maximum      
Noncontrolling Interest [Line Items]      
Term of conditional right put interest 15 years