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Affiliate Equity - Recognized and Unrecognized Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Affiliate Equity Expense      
Total $ 40.5 $ 56.4 $ 50.0
Non-controlling Interests      
Affiliate Equity Expense      
Non-controlling interests $ 30.9 $ 39.7 $ 36.8
Unrecognized Affiliate Equity Expense      
Remaining Life 6 years 6 years 6 years
Non-controlling Interests $ 124.6 $ 118.3 $ 95.9
Controlling Interest      
Affiliate Equity Expense      
Controlling interest 9.6 16.7 13.2
Unrecognized Affiliate Equity Expense      
Controlling Interest $ 40.9 $ 38.7 $ 33.3
Remaining Life 4 years 5 years 5 years