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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 10.0   10.0  
Shares available for future grants 8.3   8.3  
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs $ 0.1   $ 0.1  
Weighted average vesting period     6 months 14 days  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Restricted Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value, grants     $ 7.79 $ 9.56
Unrecognized compensation costs 13.8   $ 13.8  
Weighted average vesting period     2 years 1 month 24 days  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Total fair value of stock that vested during the period     $ 29.6 $ 30.7
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid     $ 12.1 $ 2.0
Weighted average grant date fair value, grants     $ 7.93 $ 9.55
Unrecognized compensation costs 2.6   $ 2.6  
Weighted average vesting period     2 years 1 month 28 days  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Restricted Share Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value, grants     $ 7.90 $ 9.55
Unrecognized compensation costs 0.1   $ 0.1  
Weighted average vesting period     1 year 2 months 19 days  
Total [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated Share Based Compensation 1.6 $ 3.2 $ 11.3 $ 7.2
Net gain (loss) from asset sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated Share Based Compensation 0.0 2.2 1.5 2.2
General and Administrative Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated Share Based Compensation $ 1.6 $ 1.0 $ 9.8 $ 5.0