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Affiliate Equity - Summary of Affiliate Equity Expense (Recognized and Unrecognized) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Affiliate Equity      
Non-controlling interest $ 51.6 $ 37.0 $ 15.9
Total 62.0 66.2 50.6
Non-Controlling Interests      
Affiliate Equity      
Total 51.6 37.0 15.9
Unrecognized Affiliate Equity Expense      
Non-Controlling Interest $ 51.9 $ 41.6 $ 32.1
Remaining Life 5 years 6 years 7 years
Affiliate Partners      
Affiliate Equity      
Controlling interest $ 16.9 $ 47.4 $ 56.4
Tax benefit (6.5) (18.2) (21.7)
Controlling interest, net 10.4 29.2 34.7
Unrecognized Affiliate Equity Expense      
Controlling Interest $ 22.4 $ 29.5 $ 36.1
Remaining Life 3 years 3 years 3 years