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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares available for issuance 4.3   4.3  
Compensation cost $ 1.9 $ 1.9 $ 5.6 $ 5.3
Income tax benefit recognized in the income statement for stock-based awards 0.7 0.6 2.4 1.5
Weighted-average fair value per option granted     $ 9.91  
Total cash received as a result of stock option exercises     11.7 10.4
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards     2.5 1.8
Total intrinsic value of stock options exercised     $ 2.9 $ 2.9
Restricted Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Employee Awards [Member] | Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Contractual life of options     10 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