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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Affiliate Equity [Line Items]          
Affiliate equity expense $ 10.0 $ 21.7 $ 38.6 $ 34.9  
Non-controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 7.7 18.5 $ 29.2 27.2  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life (in years)     5 years   5 years
Non-Controlling Interest     $ 82.5   $ 70.7
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest $ 2.3 $ 3.2 9.4 $ 7.7  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest     $ 33.0   $ 31.3
Remaining Life (in years)     4 years   4 years