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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized to issue of shares 80,000,000 80,000,000  
Shares available for future grants 1,541,512    
Net proceeds from exercise of stock options $ 0 $ 1.8 $ 0.4
Exercised, shares   198,900 48,400
First Amended And Restated Two Thousand And Four Long Term Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized to issue of shares 2,700,000    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercised, shares   198,900 48,400
Income tax benefits realized from the exercise of stock options   2.2 0.7
Restricted Stock Units R S U [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares received for the payment of taxes upon issuance of restricted stock units 33,478 63,066 22,339
Shares received for the payment of taxes upon issuance of restricted stock units, value 1.6 2.6 0.9
Compensation expenses 4.9 4.8 4.9
Compensation expenses net of tax 3.1 3.0 3.1
Unrecognized compensation cost 10.8    
Unrecognized compensation cost, weighted average period (in years) 2 years 4 months 24 days    
Outstanding aggregate intrinsic value 29.4    
Vested aggregate intrinsic value $ 11.9    
Restricted Stock Units R S U [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Restricted Stock Units R S U [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 15 years