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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, 2019
Mar. 31, 2018
Apr. 25, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based Compensation $ 9.3 $ 13.7  
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 (0.6)    
Vested $ 21.57    
Granted 1.2    
Granted $ 4.08    
Non-vested at March 31, 2019 2.2    
Non-vested at March 31, 2019 $ 10.62    
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 $ 26.78    
Vested (0.2)    
Vested $ 26.60    
Non-vested at March 31, 2019 2.3    
Non-vested at March 31, 2019 $ 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    
Subsequent Event [Member] | 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