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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Affiliate Equity [Line Items]          
Affiliate equity expense $ 9.2 $ 16.0 $ 32.2 $ 43.7  
Non-controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 6.9 9.9 $ 24.9 32.8  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life     6 years   6 years
Non-controlling Interests     $ 129.1   $ 118.3
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest $ 2.3 $ 6.1 7.3 $ 10.9  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest     $ 42.1   $ 38.7
Remaining Life     5 years   5 years