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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Affiliate Equity [Line Items]          
Affiliate equity expense $ 8.3 $ 11.9 $ 27.7 $ 28.5  
Non-controlling Interests          
Affiliate Equity [Line Items]          
Non-controlling interests 6.1 8.8 $ 22.9 21.4  
Unrecognized Affiliate Equity Expense [Abstract]          
Remaining Life (in years)     6 years   6 years
Non-Controlling Interest     $ 123.6   $ 95.9
Affiliated Entity          
Affiliate Equity [Line Items]          
Controlling interest $ 2.2 $ 3.1 4.8 $ 7.1  
Unrecognized Affiliate Equity Expense [Abstract]          
Controlling Interest     $ 40.2   $ 33.3
Remaining Life (in years)     5 years   5 years