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Share-Based Compensation and Equity (Textuals) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends, per share, cash paid $ 0.10 $ 0.40 $ 0.96
Number of Shares Authorized 6,100,000    
Number of Shares Available for Grant 3,600,000    
Aggregate intrinsic value of options exercised $ 0.0 $ 0.0  
Weighted-average grant-date fair value of stock options granted $ 4.21 $ 4.57 $ 5.37
Total fair value of stock options vested $ 3.0 $ 2.4 $ 2.6
Issuance of common shares $ 0.0 $ 0.3 $ 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 $ 17.34 [1] $ 26.81 $ 26.77
Total fair value of deferred shares vested $ 18.9 $ 13.9 $ 7.2
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 $ 22.65 $ 31.31 $ 26.99
Total fair value of deferred shares vested $ 5.5 $ 3.6 $ 3.1
Performance Shares [Member] | Three year graded vest [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Director Deferred Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value of deferred shares released $ 0.0 $ 0.0 $ 0.0
Total fair value of deferred shares vested $ 0.0    
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 $ 14.98    
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, 2018 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 $14.98