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Equity - Share Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-Based Compensation [Line Items]        
Share based compensation recognized $ 18.0 $ 1.4 $ 31.8 $ 16.7
Unrecognized stock-based compensation expense 64.6   64.6  
Future Allocated Share-based Compensation, Expense Remainder of Fiscal Year 8.7   8.7  
Future Allocated Share-based Compensation Expense Year Two 13.9   13.9  
Future Allocated Share-based Compensation Expense Year Three 5.0   5.0  
Future Allocated Share-based Compensation Expense Year Four 0.8   0.8  
Unrecognized compensation expense not expected to vest $ 36.2   $ 36.2  
Restricted stock units        
Share-Based Compensation [Line Items]        
Units granted during period (in shares)     0.6  
Units vested in period (in shares)     0.4  
Outstanding at the end of the period (in shares) 1.3   1.3  
Performance stock units        
Share-Based Compensation [Line Items]        
Units granted during period (in shares)     0.3  
Stock options        
Share-Based Compensation [Line Items]        
Stock options outstanding at the end of the period (in shares) 0.6   0.6