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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Affiliate Equity [Line Items]          
Affiliate equity compensation expense $ 9.5 $ 9.2 $ 36.3 $ 32.2  
Non-controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 6.0 6.9 $ 24.9 24.9  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life     5 years   6 years
Non-controlling Interests 115.2   $ 115.2   $ 124.6
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest 3.5 $ 2.3 11.4 $ 7.3  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest $ 37.6   $ 37.6   $ 40.9
Remaining Life     4 years   4 years