| Document and Entity Information | Aug. 18, 2021 |
| Entity Listings [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 18, 2021 |
| Entity Registrant Name | BRUNSWICK CORPORATION |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-01043 |
| Entity Tax Identification Number | 36-0848180 |
| Entity Address, Address Line One | 26125 N. Riverwoods Blvd., Suite 500 |
| Entity Address, City or Town | Mettawa |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60045-3420 |
| City Area Code | 847 |
| Local Phone Number | 735-4700 |
| 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 | 0000014930 |
| New York Stock Exchange [Member] | Common Stock [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Common stock, par value $0.75 per share |
| Trading Symbol | BC |
| Security Exchange Name | NYSE |
| New York Stock Exchange [Member] | 6.500% Senior Notes due 2048 [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | 6.500% Senior Notes due 2048 |
| Trading Symbol | BC-A |
| Security Exchange Name | NYSE |
| New York Stock Exchange [Member] | 6.625% Senior Notes due 2049 [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | 6.625% Senior Notes due 2049 |
| Trading Symbol | BC-B |
| Security Exchange Name | NYSE |
| New York Stock Exchange [Member] | 6.375% Senior Notes due 2049 [Member] | |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | 6.375% Senior Notes due 2049 |
| Trading Symbol | BC-C |
| Security Exchange Name | NYSE |
| Chicago Stock Exchange [Member] | Common Stock [Member] | |
| Entity Listings [Line Items] | |
| Security Exchange Name | CHX |
