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STOCK-BASED COMPENSATION PLANS (DETAILS) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 11.6 $ 13.7 $ 11.9
Tax benefit related to stock-based compensation 4.2 4.9 4.0
Unrecognized stock-based compensation for non-vested options and awards 8.8    
Unrecognized stock-based compensation awards weighted-average period (in years) 1.7    
Shares remaining available for future grants of either options or stock awards (in shares) 6,900,000    
Shares authorized under stock-based compensation plans (in shares) 2,507,982    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate 10.00%    
Stock options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 3.0 4.0 4.3
Unrecognized stock-based compensation for non-vested options and awards 1.9    
Unrecognized stock-based compensation awards weighted-average period (in years) 1.9    
Term of options granted 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected volatility 56.00% 55.00% 52.00%
Expected term (in years) 6 6 6
Risk-free interest rate 2.26% 2.78% 2.01%
Expected dividend yield 0.00% 0.00% 0.00%
Weighted-average grant date fair value per share (in dollars per share) $ 32.79 $ 18.05 $ 14.00
Estimated fair value of options granted (millions) 2.4 2.3 5.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 1,146,520    
Granted (in Shares) 73,861    
Exercised (in shares) (562,883)    
Forfeited or expired (in shares) (6,700)    
Outstanding, ending balance (in shares) 650,798 1,146,520  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Outstanding, beginning balance, Weighted-Average Exercise Price Per Share (in dollars per share) $ 30.27    
Outstanding, beginning balance, Weighted-Average Contractual Life (in yerars) 6.4    
Outstanding, beginning balance, Aggregate Intrinsic Value 30.3    
Granted, Weighted-Average Exercise Price Per Share (in dollars per share) $ 61.23    
Exercised, Weighted-Average Exercise Price Per Share (in dollars per share) $ 30.00    
Fofeited or expired, Weighted-Average Exercise Price Per Share (in dollars per share) $ 28.13    
Outstanding, ending balance, Weighted-Average Exercise Price Per Share (in dollars per share) $ 34.03 $ 30.27  
Outstanding, ending balance, Weighted-Average Contractual Life (in yerars) 6.5 6.4  
Outstanding, beginning balance, Aggregate Intrinsic Value 26.7 30.3  
Exercisable, Outstanding (in shares) 176,203    
Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share) $ 35.51    
Exercisable, Weighted-Average Contractual Life (in years) 5.2    
Exercisable, Aggregate Intrinsic Value 7.0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]      
Vested or expected to vest, Shares 647,590    
Vested or expected to vest, Weighted-Average Exercise Price Per Share (in dollars per share) $ 34.03    
Vested or expected to vest, Weighted-Average Contractual Life (in years) 6.5    
Vested or expected to vest, Aggregate Intrinsic Value 26.6    
Intrinsic value of option exercises 19.9 22.8 1.6
Cash received from stock option exercises 16.8 37.4 8.3
Tax benefit related to stock option exercises 7.5 8.6 0.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 3.4 3.9 4.4
Stock awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 7.7 8.8 5.8
Unrecognized stock-based compensation for non-vested options and awards 6.9    
Unrecognized stock-based compensation awards weighted-average period (in years) 1.7    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Non-vested, beginning balance (in shares) 568,085    
Granted (in shares) 117,406    
Vested (in shares) (260,957)    
Forfeited (in shares) (26,714)    
Non-vested, ending balance (in shares) 397,820 568,085  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Non-vested, beginning balance, Weighted-Average Grant Date Fair Value (in dollars per share) $ 29.55    
Non-vested, beginning balance, Weighted-Average Contractual Life (in years) 1.0 1.1  
Non-vested, beginning balance, Aggregate Intrinsic Value 32.2    
Granted, Weighted-Average Grant Date Fair Value (in dollars per share) $ 61.28    
Vested, Weighted-Average Grant Date Fair Value (in dollars per share) $ 22.87    
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) $ 32.61    
Non-vested, ending balance, Weighted-Average Price Per Share (in dollars per share) $ 39.54 $ 29.55  
Non-vested, ending balance, Weighted-Average Contractual Life (in years) 1.0 1.1  
Non-vested, ending balance, Aggregate Intrinsic Value 29.9 32.2  
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]      
Stock awards vesting period 3 years    
Deferred stock awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 0.3 0.3 0.3
Employee stock purchase plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 0.6 $ 0.6 $ 1.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Granted (in shares) 62,782 15,549 184,488
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 85.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate 10.00%