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Share-Based Compensation and Equity (Textuals) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends, per share, cash paid $ 0.96 $ 1.15 $ 1.15
Number of Shares Authorized 8,300,000    
Number of Shares Available for Grant 4,100,000    
Aggregate intrinsic value of options exercised   $ 0.7 $ 2.1
Weighted-average grant-date fair value of stock options granted $ 5.37 $ 7.04 $ 6.75
Total fair value of stock options vested $ 2.6 $ 2.7 $ 1.8
Issuance of common shares $ 0.3 $ 3.5 $ 14.6
Document Period End Date Dec. 31, 2016    
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 $ 26.77 [1] $ 32.74 $ 35.25
Total fair value of deferred shares vested $ 7.2 $ 6.4 $ 4.4
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 $ 26.99 $ 32.50 $ 38.07
Total fair value of deferred shares vested $ 3.1 $ 5.1 $ 0.0
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    
Granted, Weighted-average grant-date fair value     $ 29.73
Aggregate intrinsic value of deferred shares released $ 0.2 0.2 $ 0.1
Total fair value of deferred shares vested $ 0.2 $ 0.0 $ 0.9
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 $ 27.42    
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, 2016 include 41 thousand 1-year RSUs to non-employee directors under the 1991 Plan. These RSUs have a weighted-average grant-date fair value of $27.42