Quarterly Financial Data - Additional Information (Detail) - Trade Names [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information [Line Items]
Pre-tax defined benefit plan actuarial gains (losses)	$ 32.0	$ 2.1	$ 3.5	$ 0.3	$ 34.1	$ 3.8
After-tax defined benefit plan actuarial gains (losses)	$ 24.2	$ 1.6	$ 2.8	$ 0.2

Defined Benefit Plan, Actuarial Gain (Loss) Before Tax

No definition available.

Name:	fbhs_DefinedBenefitPlanActuarialGainLossBeforeTax
Namespace Prefix:	fbhs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration