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Affiliate Equity - Summary of Affiliate Recognized and Unrecognized Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Affiliate Equity [Line Items]          
Affiliate equity expense $ 10.2 $ 12.4 $ 26.8 $ 23.0  
Non-controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 5.1 9.6 $ 18.9 18.0  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life     5 years   6 years
Non-controlling Interests 117.5   $ 117.5   $ 124.6
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest 5.1 $ 2.8 7.9 $ 5.0  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest $ 40.0   $ 40.0   $ 40.9
Remaining Life     4 years   4 years