| Document and Entity Information | Dec. 08, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Amendment Form 8-K (the “Amendment”) is being filed as an amendment to the Current Report on Form 8-K filed by Fortune Brands Home & Security, Inc. (the “Company”) on December 9, 2020 (the “Original 8-K”). The Original 8-K was filed to announce the election of Jeffery S. Perry as a Class I member of the Board of Directors effective December 8, 2020. Mr. Perry’s committee assignments had not yet been determined at the time of the filing of the Original 8-K. The purpose of this Amendment is to disclose that the Board of Directors appointed Mr. Perry to serve as a member of the Board’s Audit Committee and Nominating, Environmental, Social and Governance Committee effective February 23, 2021. |
| Document Period End Date | Dec. 8, 2020 |
| Entity Registrant Name | Fortune Brands Home & Security, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-35166 |
| 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 |
| City Area Code | 847 |
| Local Phone Number | 484-4400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001519751 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | FBHS |
| Security Exchange Name | NYSE |
