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Share-Based Compensation and Equity (Textuals) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends, per share, cash paid $ 1.15 $ 1.15 $ 1.15
Number of Shares Authorized 8,600,000    
Number of Shares Available for Grant 5,000,000    
Aggregate intrinsic value of options exercised $ 0.7 $ 2.1 $ 2.1
Weighted-average grant-date fair value of stock options granted $ 7.04 $ 6.75 $ 7.79
Total fair value of stock options vested $ 2.7 $ 1.8 $ 8.0
Issuance of common shares $ 3.5 $ 14.6 $ 16.7
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 $ 32.74 [1] $ 35.25 $ 30.14
Total fair value of deferred shares vested $ 6.4 $ 4.4 $ 9.2
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 $ 32.50 $ 38.07 $ 29.15
Total fair value of deferred shares vested $ 5.1 $ 0.0 $ 1.1
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    
Granted, Weighted-average grant-date fair value     $ 29.73
Total fair value of deferred shares vested $ 0.0 $ 0.9 $ 1.1
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 $ 33.85    
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 | 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 $ 35.92    
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, 2015 include 33 thousand 1-year RSUs to non-employee directors under the 1991 Plan. These RSUs have a weighted-average grant-date fair value between $33.85 and $35.92.