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Share-Based Compensation and Equity (Textuals) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends, per share, cash paid $ 0.40 $ 0.96 $ 1.15
Number of Shares Authorized 4,900,000    
Number of Shares Available for Grant 4,800,000    
Aggregate intrinsic value of options exercised $ 0.0 $ 0.0 $ 0.7
Weighted-average grant-date fair value of stock options granted $ 4.57 $ 5.37 $ 7.04
Total fair value of stock options vested $ 2.4 $ 2.6 $ 2.7
Issuance of common shares $ 0.3 $ 0.3 $ 3.5
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 $ 26.81 [1] $ 26.77 $ 32.74
Total fair value of deferred shares vested $ 13.9 $ 7.2 $ 6.4
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 $ 31.31 $ 26.99 $ 32.50
Total fair value of deferred shares vested $ 3.6 $ 3.1 $ 5.1
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]      
Number Of Common Shares Issued Per Award 1    
Aggregate intrinsic value of deferred shares released $ 0.0 0.2 $ 0.2
Total fair value of deferred shares vested   $ 0.2  
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 $ 28.80    
Minimum | Director Deferred Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 6 months    
Maximum | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
Maximum | Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 7 years    
Maximum | Director Deferred Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 12 months    
[1] (1) The RSUs granted during the year ended December 31, 2017 include 57 thousand one-year RSUs to non-employee directors under the 1991 Plan. These RSUs have a weighted-average grant-date fair value of $28.80