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Share-Based Compensation and Equity (Textuals) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends, per share, cash paid $ 0 $ 0.10 $ 0.40
Number of Shares Authorized 9,100,000    
Number of Shares Available for Grant 4,100,000    
Aggregate intrinsic value of options exercised $ 0.0 $ 0.0  
Weighted-average grant-date fair value of stock options granted $ 2.00 $ 4.21 $ 4.57
Total fair value of stock options vested $ 7.8 $ 3.0 $ 2.4
Issuance of common shares $ 0.0 $ 0.0 $ 0.3
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Of Common Shares Issued Per Award 1    
Granted, Weighted-average grant-date fair value $ 5.05 [1] $ 17.34 $ 26.81
Total fair value of deferred shares vested $ 14.4 $ 18.9 $ 13.9
Restricted Stock Units [Member] | One year vest [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number Of Common Shares Issued Per Award 1    
Granted, Weighted-average grant-date fair value $ 9.90 $ 22.65 $ 31.31
Total fair value of deferred shares vested $ 6.0 $ 5.5 $ 3.6
Performance Shares [Member] | Three year graded vest [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years 3 years  
Minimum | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Minimum | Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Minimum | Restricted Stock Units [Member] | One year vest [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Weighted-average grant-date fair value $ 12.71    
Maximum | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
[1]
(1) 
The RSUs granted during the year ended December 31, 2019 included 0.1 one year RSUs to non-employee directors under the 1991 Plan. These RSUs had a weighted-average, grant-date fair value of $12.71