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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock-based compensation expense      
Pre-tax compensation expense $ 15.7 $ 13.3 $ 13.9
Compensation related to modification of vesting and termination provisions of certain stock options, performance shares and restricted share awards for senior management severance 2.6    
Compensation expense related to the early retirement of certain executives     1.8
The amount of financing cash flows of excess income tax benefits related to share-based compensation expense 3.2 1.3 0.1
2008 Executive Incentive Program
     
Stock-based compensation      
Shares available for grant under the plan 1,924,953    
2005 Nonemployee Director Equity Plan
     
Stock-based compensation      
Shares available for grant under the plan 291,409    
Restricted and Performance Share Award | 2008 Executive Incentive Program
     
Stock-based compensation      
Shares available for grant under the plan 435,225    
Stock options
     
Stock-based compensation      
Maximum term life (in years) 10 years    
Stock options granted (in shares) 637,255 610,020 1,602,895
Vesting period (in years) of shares awarded in 2008 3 years    
Stock-based compensation expense      
Pre-tax compensation expense 6.6 5.3 7.2
After-tax compensation expense 4.1 3.6 4.5
Impact on diluted EPS (in dollars per share) $ 0.07 $ 0.06 $ 0.07
Unrecognized compensation cost related to stock options $ 4.7    
Weighted average period of recognition of unrecognized compensation cost related to stock options (in years) 1.7    
Weighted-average assumptions used to estimate grant date fair value of stock options      
Expected dividend yield (as a percent) 1.70% 1.90% 3.20%
Expected life in years 5.76 5.75 5.64
Expected volatility (as a percent) 32.00% 32.70% 36.40%
Risk-free interest rate (as a percent) 2.20% 2.70% 2.00%
Weighted average fair value (in dollars per share) $ 10.61 $ 9.70 $ 4.99
Stock options | Awards 2008 and thereafter
     
Stock-based compensation      
Portion of stock options vesting on the first anniversary 0.3333    
Portion of stock options vesting on the second anniversary 0.3333    
Portion of stock options vesting on the third anniversary 0.3333    
Stock options | Awards Prior To 2008
     
Stock-based compensation      
Portion of stock options vesting on the first anniversary 0.3333    
Portion of stock options vesting on the second anniversary 0.3333    
Portion of stock options vesting on the date of grant 0.3333