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Affiliate Equity - Summary of Affiliate Recognized and Unrecognized Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Affiliate Equity [Line Items]        
Non-controlling interests $ 18.5 $ 5.9 $ 27.2 $ 49.0
Affiliate equity expense 21.7 9.2 34.9 59.2
Non- controlling Interests        
Affiliate Equity [Line Items]        
Affiliate equity expense     $ 27.2 $ 49.0
Unrecognized Affiliate Equity Expense [Abstract]        
Remaining Life (in years)     5 years 5 years
Non-Controlling Interest     $ 72.8 $ 51.9
Affiliated Entity        
Affiliate Equity [Line Items]        
Controlling interest $ 3.2 $ 3.3 7.7 10.2
Unrecognized Affiliate Equity Expense [Abstract]        
Controlling Interest     $ 32.3 $ 22.4
Remaining Life (in years)     3 years 3 years