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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Apr. 25, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Share-based Compensation $ 4.8 $ 6.6 $ 14.1 $ 20.3  
Share Based Compensation, Decrease     $ (6.2)    
Restricted Stock Units (RSUs) [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Non-vested at January 1, 2019     1.6    
Non-vested at January 1, 2019     $ 19.66    
Vested     (0.8)    
Vested     $ 20.50    
Granted     1.5    
Granted     $ 5.10    
Non-vested at June 30, 2019 2.3   2.3    
Non-vested at June 30, 2019 $ 10.40   $ 10.40    
Performance Shares [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Non-vested at January 1, 2019     3.0    
Non-vested at January 1, 2019     $ 26.90    
Forfeited     (0.5)    
Forfeited     $ 26.80    
Vested     (0.2)    
Vested     $ 26.60    
Non-vested at June 30, 2019 2.3   2.3    
Non-vested at June 30, 2019 $ 26.90   $ 26.90    
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         3.0