Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 11, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Registrant Name	Fortune Brands Home & Security, Inc.
Entity Central Index Key	0001519751
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 13,699,604,954
Entity Common Stock, Shares Outstanding		134,174,304
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	FBHS
Security Exchange Name	NYSE
Entity File Number	1-35166
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	62-1411546
Entity Address, Address Line One	520 Lake Cook Road
Entity Address, City or Town	Deerfield
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60015-5611
City Area Code	847
Local Phone Number	484-4400
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	true
Documents Incorporated by Reference	Certain information contained in the registrant’s proxy statement for its Annual Meeting of Stockholders to be held on May 3, 2022 (to be filed not later than 120 days after the end of the registrant’s fiscal year) (the “2022 Proxy Statement”) is incorporated by reference into Part III hereof.
Auditor Name	PricewaterhouseCoopers LLP
Auditor Firm ID	238
Auditor Location	Chicago, Illinois