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Redeemable Noncontrolling Interests - Table 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Noncontrolling Interest [Abstract]        
Net income attributable to nonredeemable noncontrolling interests $ 17.3 $ 17.7 $ 36.2 $ 36.3
Net income attributable to redeemable noncontrolling interests 2.4 3.7 6.4 6.5
Net income attributable to noncontrolling interests $ 19.7 $ 21.4 $ 42.6 $ 42.8