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Affiliate Equity - Recognized and Unrecognized Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Affiliate Equity Expense      
Total $ 56.4 $ 50.0 $ 41.2
Non- controlling Interests      
Affiliate Equity Expense      
Non-controlling interests 39.7 36.8 31.2
Total $ 39.7 $ 36.8 $ 31.2
Unrecognized Affiliate Equity Expense      
Remaining Life 6 years 6 years 5 years
Non-controlling Interests $ 118.3 $ 95.9 $ 70.7
Controlling Interest      
Affiliate Equity Expense      
Controlling interest 16.7 13.2 10.0
Unrecognized Affiliate Equity Expense      
Controlling Interest $ 38.7 $ 33.3 $ 31.3
Remaining Life 5 years 5 years 4 years