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Benefit Plans (Narrative) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Active Employees [Member]
Dec. 31, 2010
U.S. [Member]
Dec. 31, 2011
U.S. [Member]
Dec. 31, 2010
U.S. [Member]
Dec. 31, 2011
Pension Plans [Member]
Dec. 31, 2010
Pension Plans [Member]
Dec. 31, 2009
Pension Plans [Member]
Dec. 31, 2011
Deferred Profit Sharing [Member]
Dec. 31, 2010
Deferred Profit Sharing [Member]
Dec. 31, 2009
Deferred Profit Sharing [Member]
Dec. 31, 2011
Employee Stock Purchase Plan [Member]
Dec. 31, 2010
Employee Stock Purchase Plan [Member]
Dec. 31, 2009
Employee Stock Purchase Plan [Member]
Dec. 31, 2011
401 K Savings Plan [Member]
Dec. 31, 2011
Defined Contribution Pension [Member]
Dec. 31, 2010
Defined Contribution Pension [Member]
Dec. 31, 2009
Defined Contribution Pension [Member]
Dec. 31, 2011
Deferred Compensation Plans [Member]
Dec. 31, 2010
Deferred Compensation Plans [Member]
Dec. 31, 2009
Deferred Compensation Plans [Member]
Dec. 31, 2011
Management [Member]
Deferred Compensation Plans [Member]
Dec. 31, 2011
Director [Member]
Deferred Compensation Plans [Member]
Defined Benefit Plan Disclosure [Line Items]                                                
U.S. Pension Plan Termination description          

On January 27, 2010, the Company's Board of Directors approved the termination, effective April 15, 2010, of The Church & Dwight Co., Inc. Retirement Plan for Hourly Employees (the "U.S. Pension Plan"), under which approximately 766 participants, including 46 active employees, have accrued benefits. On December 1, 2010, the Company as plan sponsor of the U.S. Pension Plan, purchased a non participating group annuity contract from the Principal Life Insurance Company for the benefit of certain former and current employees with vested benefits in, and retired participants currently receiving benefits from, the U.S. Pension Plan. In addition, effective December 1, 2010, an existing participating annuity contract with Aetna Insurance Company was changed to a non-participating annuity contract.

                                   
Number of participants that have accrued benefits   766 46                                          
Settlements           $ 63,000,000 $ 0 $ 63,200,000                                
Contract purchase price payment before tax         14,000,000                                      
Contract purchase price payment, net of tax         9,000,000                                      
Charge on earnings before tax, due to transfer disposal of pension plan benefit and assets to contract             0 24,300,000 (700,000)                              
Charge to earnings in pre-tax pension plan obligations       24,000,000                                        
Charge on earnings before tax, due to transfer disposal of pension plan benefit and assets to contract, per share       $ 0.11                                        
Increase in pension plan obligations 7,600,000                                              
Increase in postretirement benefit plan obligations 2,300,000                                              
Amount of basis point change             0.50%                                  
Result of 50 basis point change in the expected long-term rate of return 400,000                                              
Asset mix, target equity securities 60.00%                                              
Asset mix, target debt/guaranteed investment securities 40.00%                                              
Cash contributions to pension plans 4,800,000           4,800,000 19,300,000                                
Estimated cash contributions by employer in 2012 3,600,000                                              
Projected health-care cost trend rate in 2012 9.00%                                              
Ultimate health-care cost trend rate in 2029 5.00%                                              
Year that rate reaches Ultimate health-care cost trend rate 2029                                              
Employer contribution description                               The Company matches 50% of each employee's contribution up to a maximum of 6% of the employee's earnings.                
Amounts charged to earnings for defined contribution profit sharing plan                   10,500,000 11,500,000 17,300,000         3,700,000 3,700,000 3,500,000          
Percentage of employer matching                                 50.00%              
Percentage of employee gross pay employer contributes 50%                                 6.00%              
Stock purchase limit per employee                         25,000                      
Discount rate on market price                         15.00%                      
Employee stock purchase plan expenses                         500,000 500,000 500,000                  
Eligible percentage of regular compensation, maximum                                             85.00% 100.00%
Deferred compensation liability   57,700,000                                   64,100,000        
Deferred compensation funded status             (17,600,000) (13,300,000)                       47,400,000 42,700,000      
Amounts charged to earnings                                       $ 2,900,000 $ 2,400,000 $ 1,600,000    
Vesting percentage                                               100.00%
Shares held in rabbi trust                                       139   240