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Affiliate Equity - Summary of Affiliate Recognized and Unrecognized Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Affiliate Equity [Line Items]          
Affiliate equity compensation expense $ 11.7 $ 9.5 $ 46.4 $ 36.3  
Non- controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 8.9 6.0 $ 36.5 24.9  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life     4 years   5 years
Non-controlling Interests 108.1   $ 108.1   $ 109.7
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest 2.8 $ 3.5 9.9 $ 11.4  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest $ 47.6   $ 47.6   $ 35.9
Remaining Life     5 years   4 years