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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock-based compensation        
Pre-tax compensation expense $ 2.9 $ 4.5 $ 10.9 $ 9.9
2008 Executive Incentive Program
       
Stock-based compensation        
Shares available for grant under the plan 3,051,670   3,051,670  
2005 Nonemployee Director Equity Plan
       
Stock-based compensation        
Shares available for grant under the plan 267,745   267,745  
Stock options
       
Stock-based compensation        
Pre-tax compensation expense 1.3 1.6 2.4 3.5
Stock options granted (in shares)     283,975  
Maximum term life     10 years  
Weighted-average assumptions used to estimate grant date fair value of stock options        
Expected dividend yield (as a percent)     1.20% 1.50%
Expected life in years     5 years 8 months 16 days 5 years 9 months 11 days
Expected volatility (as a percent)     32.20% 36.00%
Risk-free interest rate (as a percent)     1.00% 0.90%
Weighted average fair value (in dollars per share)     $ 17.58 $ 14.57
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  
Restricted stock awards
       
Stock-based compensation        
Awards granted (in shares)     71,255  
Performance share awards
       
Stock-based compensation        
Awards granted (in shares)     71,255  
Aggregate grant date fair value of stock options, restricted stock awards and performance share awards     $ 16.9  
Restricted and Performance Share Award | 2008 Executive Incentive Program
       
Stock-based compensation        
Shares available for grant under the plan 686,985   686,985  
Restricted and Performance Share Award | 2005 Nonemployee Director Equity Plan
       
Stock-based compensation        
Shares available for grant under the plan 37,745   37,745