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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares available for issuance 4.3   4.3  
Compensation cost $ 2.2 $ 1.9 $ 3.7 $ 3.4
Income tax benefit recognized in the income statement for stock-based awards 1.0 0.4 1.7 0.9
Weighted-average fair value per option granted $ 10.74   $ 9.91  
Total cash received as a result of stock option exercises     10.8 5.8
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards     2.3 1.3
Total intrinsic value of stock options exercised     $ 2.7 $ 1.4
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