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Affiliate Equity - Recognized and Unrecognized Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Affiliate Equity Expense      
Non-controlling interest $ 36.8 $ 31.2 $ 51.6
Total 50.0 41.2 68.5
Non- controlling Interests      
Affiliate Equity Expense      
Total $ 36.8 $ 31.2 $ 51.6
Unrecognized Affiliate Equity Expense      
Remaining Life 6 years 5 years 5 years
Non-Controlling Interest $ 95.9 $ 70.7 $ 51.9
Controlling Interest      
Affiliate Equity Expense      
Controlling interest 13.2 10.0 16.9
Unrecognized Affiliate Equity Expense      
Controlling Interest $ 33.3 $ 31.3 $ 22.4
Remaining Life 5 years 4 years 3 years