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STOCK-BASED COMPENSATION AND OTHER STOCK-BASED PAYMENTS (Details 1) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Compensation Expense and Related Tax Benefit      
Stock-based compensation $ 65.7 $ 68.2 $ 40.7
Share-based compensation, cumulative charges for adjustment of the estimated probable outcome on unvested performance awards 10.3 13.4  
Stock-based compensation cost, non-employee directors 1.7 1.3 1.1
Stock-based compensation - related tax benefit $ 8.1 $ 7.5 $ 4.9
Stock Option Awards
     
Stock-Based Compensation, Award Terms      
Grant term (in years) 10    
Vesting period (in years) 3 years    
Restricted Stock Units, Performance Share Units and Restricted Stock Awards
     
Stock-Based Compensation, Award Terms      
Vesting period (in years) 1 to 4    
Restricted Stock Units, Performance Share Units and Restricted Stock Awards | Minimum [Member]
     
Stock-Based Compensation, Award Terms      
Vesting period (in years) 1 year    
Restricted Stock Units, Performance Share Units and Restricted Stock Awards | Maximum [Member]
     
Stock-Based Compensation, Award Terms      
Vesting period (in years) 4 years    
1999 Plan
     
Stock-Based Compensation, Award Terms      
Shares of priceline.com common stock authorized for issue under plan (in shares) 9,195,833    
Shares available to be issued under the plan (in shares) 792,227