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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Affiliate Equity [Line Items]          
Affiliate equity expense $ 12.4 $ 8.3 $ 23.0 $ 27.7  
Non-controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 9.6 6.1 $ 18.0 22.9  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life     6 years   6 years
Non-controlling Interests     $ 134.4   $ 118.3
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest $ 2.8 $ 2.2 5.0 $ 4.8  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest     $ 42.2   $ 38.7
Remaining Life     5 years   5 years