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Redeemable Noncontrolling Interests - Reconciliation of Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Noncontrolling Interest [Abstract]        
Net income attributable to nonredeemable noncontrolling interests $ 24.5 $ 20.2 $ 73.6 $ 53.2
Net income attributable to redeemable noncontrolling interests 2.2 2.2 7.3 5.7
Net income attributable to noncontrolling interests $ 26.7 $ 22.4 $ 80.9 $ 58.9