Quarterly Financial Data - Additional Information (Detail) - Tradenames [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information [Line Items]
Pre-tax defined benefit plan actuarial gains (losses)	$ 3.5	$ 0.3	$ (0.8)	$ 1.3	$ 3.8	$ 0.5
After-tax defined benefit plan actuarial gains (losses)	$ 2.8	$ 0.2	$ (0.5)	$ 0.9

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