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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Income tax benefit $ 1.0 $ 1.1
Stock-Based Compensation Activity    
Cash Received from Exercise of Stock Options 0.2  
Tax Benefit Realized from Exercise of Stock Options 0  
Maximum payout range 200.00%  
Performance Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 2.6 2.5
Restricted Stock [Member]
   
Stock-Based Compensation Activity    
Number of shares granted 2,970  
Fair value of shares granted $ 59.41  
Stock Compensation Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 2.7 2.7
Common Stock
   
Stock-Based Compensation Activity    
Number of shares issued 258,260  
Restricted Stock [Member]
   
Stock-Based Compensation Activity    
Shares Paid for Tax Withholding for Share Based Compensation 332  
Treasury Stock [Member]
   
Stock-Based Compensation Activity    
Number of shares issued 62,632  
Total Shareholder Return [Member]
   
Stock-Based Compensation Activity    
Number of shares granted 156,974  
Fair value of shares granted $ 58.61  
Equity Instruments Other than Options, Converted in Period 188,631 [1]  
Total Shareholder Return [Member] | Performance Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 2.0 1.8
Performance Units Related to Earnings Per Share [Member]
   
Stock-Based Compensation Activity    
Number of shares granted 37,094  
Fair value of shares granted $ 53.45  
Equity Instruments Other than Options, Converted in Period 62,880 [1]  
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 0.6 0.7
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 0.1 $ 0.2
[1] Performance units were converted based on a payout ratio of 200 percent of the target number of performance units granted in February 2010 and are included in the 258,260 and 62,632 shares of common stock issued during the three months ended March 31, 2013 as discussed above.