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Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Noncontrolling Interest [Abstract]    
Net income attributable to nonredeemable noncontrolling interests $ 18.6 $ 14.5
Net income attributable to redeemable noncontrolling interests 2.8 3.1
Net income attributable to noncontrolling interests $ 21.4 $ 17.6