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Affiliate Equity - Summary of Affiliate Recognized and Unrecognized Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Affiliate Equity [Line Items]        
Affiliate equity expense $ 11.9 $ 7.2 $ 28.5 $ 13.2
Non- controlling Interests        
Affiliate Equity [Line Items]        
Non-controlling interests 8.8 4.8 $ 21.4 $ 8.7
Unrecognized Affiliate Equity Expense [Abstract]        
Remaining Life (in years)     5 years 5 years
Non-Controlling Interest     $ 83.8 $ 70.7
Affiliated Entity        
Affiliate Equity [Line Items]        
Controlling interest $ 3.1 $ 2.4 7.1 4.5
Unrecognized Affiliate Equity Expense [Abstract]        
Controlling Interest     $ 32.8 $ 31.3
Remaining Life (in years)     4 years 4 years