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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 25, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Share-based Compensation $ 3.5 $ 5.2 $ 11.1 $ 19.4  
Share Based Compensation, Decrease     (8.3)    
performance units and restricted stock units [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Share-based Compensation $ 11.1 $ 2.3 $ 17.5 $ 7.2  
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     $ 13.11    
Vested     (1.0)    
Vested     $ 12.60    
Granted     0.9    
Granted     $ 10.64    
Non-vested at September 30, 2020 2.0   2.0    
Non-vested at September 30, 2020 $ 8.84   $ 8.84    
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     $ 34.49    
Vested     (0.3)    
Vested     $ 26.60    
Non-vested at September 30, 2020 1.3   1.3    
Non-vested at September 30, 2020 $ 21.73   $ 21.73    
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   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