| Document and Entity Information | Dec. 08, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| 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 |
