Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions				3 Months Ended	12 Months Ended			20 Months Ended
	Dec. 01, 2020	Apr. 30, 2020	May 01, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Mar. 08, 2018	Jan. 17, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Increase in interest rate swap lock agreements liability					$ 27.5			$ 27.5
Payment of contingent consideration					14.5	$ 0.0	$ 0.0
Discontinued Operation, Name of Segment [Extensible List]				chd:ConsumerDomesticAndConsumerInternationalTradeNamesMember
Selling, General and Administrative Expenses
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Increase decrease in expenses				$ 84.0
Flawless Acquisition
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Acquisition Liabilities			$ 182.0		98.0	192.0		98.0
Increase (decrease) in estimate of contingent consideration liability			$ 84.0
Flawless Acquisition | Updated Sales Forecasts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Increase (decrease) in estimate of contingent consideration liability					(94.0)	10.0		(84.0)
Agro Bio Sciences Inc
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Acquisition Liabilities										$ 17.8
Payment of contingent consideration		$ 14.5
Agro Bio Sciences Inc | Updated Sales Forecasts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Acquisition Liabilities						14.2
Passport Food Safety Solutions, Inc.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business Acquisition Liabilities									$ 7.3
Increase (decrease) in estimate of contingent consideration liability				$ (7.3)	0.0
Zicam Acquisition
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Additional cash payment	$ 20.0				$ 20.0
Business combination contingent consideration liability expired year					5 years
Designated as Hedging Instrument | Interest Rate Swap Lock
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative, Notional Amount					$ 300.0	$ 300.0		$ 300.0