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Equity - Share Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-Based Compensation [Line Items]        
Share based compensation recognized $ 7.6 $ 7.6 $ 13.8 $ 15.3
Unrecognized stock-based compensation expense 74.6   74.6  
Future Allocated Share-based Compensation, Expense Remainder of Fiscal Year 11.0   11.0  
Future Allocated Share-based Compensation Expense Year Two 15.6   15.6  
Future Allocated Share-based Compensation Expense Year Three 7.6   7.6  
Future Allocated Share-based Compensation Expense Year Four 1.2   1.2  
Unrecognized compensation expense not expected to vest $ 39.2   $ 39.2  
Restricted stock units        
Share-Based Compensation [Line Items]        
Units granted during period (in shares)     0.5  
Units vested in period (in shares)     0.4  
Outstanding at the end of the period (in shares) 1.7   1.7  
Performance stock units        
Share-Based Compensation [Line Items]        
Units granted during period (in shares)     0.2  
Stock options        
Share-Based Compensation [Line Items]        
Stock options outstanding at the end of the period (in shares) 0.6   0.6