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Redeemable Noncontrolling Interests - Reconciliation of Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Noncontrolling Interest [Abstract]        
Net income attributable to nonredeemable noncontrolling interests $ 20.2 $ 18.2 $ 53.2 $ 54.4
Net income attributable to redeemable noncontrolling interests 2.2 3.7 5.7 10.1
Net income attributable to noncontrolling interests $ 22.4 $ 21.9 $ 58.9 $ 64.5