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Share-Based Compensation - Compensation Expense and Information on Non-Vested Shares (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Apr. 25, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation $ 4.0 $ 9.3  
Share Based Compensation, Decrease (5.3)    
performance units and restricted stock units [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation $ 3.1 $ 2.1  
Restricted Stock Units (RSUs) [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Non-vested at January 1, 2020 2.2    
Non-vested at January 1, 2020 $ 9.99    
Forfeited (0.1)    
Forfeited $ 15.83    
Vested (0.8)    
Vested $ 12.26    
Granted 0.8    
Granted $ 11.71    
Non-vested at March 31, 2020 2.1    
Non-vested at March 31, 2020 $ 9.74    
Performance Shares [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Non-vested at January 1, 2020 2.4    
Non-vested at January 1, 2020 $ 26.44    
Forfeited (0.8)    
Forfeited $ 34.78    
Vested (0.3)    
Vested $ 26.60    
Non-vested at March 31, 2020 1.3    
Non-vested at March 31, 2020 $ 21.77    
Deferred Compensation, Share-based Payments [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Non-employee director deferred shares, vested 0.1    
2017 Equity and Performance Incentive Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common shares available for grant     1.9