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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Affiliate Equity [Line Items]          
Affiliate equity expense $ 16.0 $ 10.0 $ 43.7 $ 38.6  
Non- controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 9.9 7.7 $ 32.8 29.2  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life (in years)     6 years   6 years
Non-Controlling Interest     $ 120.0   $ 95.9
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest $ 6.1 $ 2.3 10.9 $ 9.4  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest     $ 36.8   $ 33.3
Remaining Life (in years)     5 years   5 years