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Employee Incentive Plans (Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 07, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allocation        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 5,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 14,070,000      
Allocated Share-based Compensation Expense   $ 30.3 $ 36.1 $ 22.4
Amount of related income tax expense recognized in income   7.1 8.3 5.3
General and Administrative        
Allocation        
Allocated Share-based Compensation Expense   23.7 31.1 16.9
Operating        
Allocation        
Allocated Share-based Compensation Expense   6.6 5.0 2.7
Non-Controlling Interest        
Allocation        
Allocated Share-based Compensation Expense   $ 11.3 $ 14.0 8.3
Predecessor | General and Administrative        
Allocation        
Allocated Share-based Compensation Expense       $ 2.8