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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares available for issuance 3.8   3.8  
Compensation cost recognized for stock-based awards $ 2.0 $ 1.9 $ 6.0 $ 5.6
Income tax benefit recognized in the income statement for stock-based awards $ 0.8 $ 0.7 $ 2.4 2.4
Weighted-average fair value per option granted     $ 8.76  
Total cash received as a result of stock option exercises     $ 1.7 11.7
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options     2.0 2.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value     $ 0.5 $ 2.9
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Contractual life of options     10 years  
Employee Awards [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Employee Awards [Member] | Restricted Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Employee Awards [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Non-Employee Awards [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     1 year