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Affiliate Equity - Recognized and Unrecognized Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Affiliate Equity Expense      
Affiliate equity compensation expense $ 51.8 $ 40.5 $ 56.4
Non-controlling Interests      
Affiliate Equity Expense      
Non-controlling interests $ 30.9 $ 30.9 $ 39.7
Unrecognized Affiliate Equity Expense      
Remaining Life 5 years 6 years 6 years
Non-controlling Interests $ 109.7 $ 124.6 $ 118.3
Affiliated Entity      
Affiliate Equity Expense      
Controlling interest 20.9 9.6 16.7
Unrecognized Affiliate Equity Expense      
Controlling Interest $ 35.9 $ 40.9 $ 38.7
Remaining Life 4 years 4 years 5 years