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Affiliate Equity - Summary of Affiliate Equity Expense (Recognized and Unrecognized) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Affiliate Equity      
Non-controlling interest $ 31.2 $ 51.6 $ 37.0
Total 41.2 68.5 84.4
Non-Controlling Interests      
Affiliate Equity      
Total 31.2 51.6 37.0
Unrecognized Affiliate Equity Expense      
Non-Controlling Interest $ 70.7 $ 51.9 $ 41.6
Remaining Life 5 years 5 years 6 years
Affiliate Partners      
Affiliate Equity      
Controlling interest $ 10.0 $ 16.9 $ 47.4
Unrecognized Affiliate Equity Expense      
Controlling Interest $ 31.3 $ 22.4 $ 29.5
Remaining Life 4 years 3 years 3 years