Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Oct. 26, 2010
Employee stock incentive plans        
Award vesting period (in years) 6 years      
Franchise Program        
Notes receivable from franchises, maximum period 5      
Notes receivable from franchises $ 4.7 $ 3.7    
Gains (loss) from the sale of customer contracts 0.8 1.1 (0.1)  
Deferred franchise fees 2.9 2.5 2.3  
Revenue from franchises 3.4 3.4 3.0  
Maximum exposure to loss relating to the franchises $ 2.0 $ 2.0 $ 2.0  
Three-for-two stock split   three-for-two, with fractional shares settled in cash    
Shares owned to receive additional share       2
Stock options
        
Employee stock incentive plans        
Award vesting period (in years) 5 years      
Award expiration period (in years) P10Y      
Time lapse restricted shares (TLRS's)
        
Employee stock incentive plans        
Award vesting period (in years) 6 years      
Award amortization period (in years) 6      
Vesting increment, starting with the second anniversary, over six years (as a percent) 20.00%