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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 55,800 55,800 100,344  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   (44,544)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 23.19 $ 23.19 $ 22.19  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 1.9 $ 1.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 1.96 1.96    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 55,800 55,800    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 11.7 11.7    
Share based compensation minimum payout range   0.00%    
Share based compensation arrangement maximum payout range   200.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   311,623 230,233 324,651
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,750,000 2,750,000    
Compensation Expense   14.7 10.2 6.7
Income tax benefit from compensation expense   5.7 3.9 2.7
Stock-Based Compensation Activity        
Shares Paid for Tax Withholding for Share Based Compensation   9,258    
Cash Received from Exercise of Stock Options   1.3 [1] 3.2 [1] 3.5 [1]
Treasury Stock, Shares, Acquired   120,000    
Treasury Stock Acquired, Average Cost Per Share $ 51.33      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 20.94 $ 20.94    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value   2.2 [1] 2.5 [1] 1.7 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 23.19 $ 23.19    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 1.9 1.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   1.96    
Tax Benefit from Stock Options Exercised   0 1.0 0.7
Stock Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 10.8 10.8    
Total Shareholder Return [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair Value of Vested Performance Units and Restricted Stock   7.4 5.4 1.9
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 414,830 414,830 507,154  
Expected life of units (in years)   2.87 2.87 2.88
Stock-Based Compensation Activity        
Number of units granted   213,721 [2] 214,750 316,513
Fair value of units granted   $ 46.09 $ 39.43 $ 25.55
Expected dividend yield   3.20% 3.90% 4.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   33.00% 34.00% 31.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.40% 1.42% 1.25%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (291,294)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 25.55    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (14,751)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 40.53 $ 40.53    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 357,974 357,974    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 42.75 $ 42.75 $ 31.40  
Performance Units Related to Earnings Per Share [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair Value of Vested Performance Units and Restricted Stock   3.9 1.9 0.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 138,277 138,277 169,054  
Stock-Based Compensation Activity        
Number of units granted   71,238 [2] 71,585 105,504
Fair value of units granted   $ 41.61 $ 32.44 $ 20.02
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (97,099)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 20.02    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   (4,916)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 34.91 $ 34.91    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 119,325 119,325    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 37.01 $ 37.01 $ 25.26  
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair Value of Vested Performance Units and Restricted Stock   1.0 0.6 0.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 37,244 37,244 47,739  
Stock-Based Compensation Activity        
Number of units granted   17,902 26,653 6,226
Fair value of units granted   $ 48.82 $ 40.78 $ 33.38
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   (28,397)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value   $ 34.05    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period   0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 0.00 $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 37,244 37,244    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 44.24 $ 44.24 $ 36.46  
Stock Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation Expense   13.7 9.3 5.8
Total Shareholder Return [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 7.8 7.8    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   1.700    
Compensation Expense   8.2 6.8 4.4
Performance Units Related to Earnings Per Share [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 3.0 3.0    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   1.560    
Compensation Expense   5.5 2.5 1.4
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 0.9 0.9    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition   2.330    
Compensation Expense   $ 1.0 $ 0.9 $ 0.9
[1] (A)The difference between the market value on the date of exercise and the option exercise price.
[2] (A) Represents target number of units granted. Actual number of units earned, if any, is dependent upon performance and may range from 0 percent to 200 percent of the target.