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
0 Months Ended 12 Months Ended
Oct. 26, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee stock incentive plans        
Award vesting period   6 years    
Franchise Program        
Notes receivable from franchises, maximum period   5 years    
Notes receivable from franchises   $ 5.1 $ 4.7  
Gains (loss) from the sale of customer contracts   0.5 0.8 1.1
Deferred franchise fees   3.0 2.9 2.5
Revenue from franchises   3.7 3.4 3.4
Maximum exposure to loss relating to the franchises   $ 2.1 $ 1.8 $ 1.2
Three-for-two stock split 1.5      
Shares owned to receive additional share 2      
Stock options
       
Employee stock incentive plans        
Award vesting period   5 years    
Award expiration period   10 years    
Time lapse restricted shares (TLRS's)
       
Employee stock incentive plans        
Award vesting period   10 years    
Award amortization period   6 years    
Vesting increment, starting with the second anniversary, over six years (as a percent)   20.00%