v3.26.1
Interest in Brunswick Corporation Master Trust - Schedule of Master Trust Net Assets (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP 154    
EBP, Master Trust [Line Items]    
Master Trust $ 175,117,402 $ 159,802,968
EBP 154 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 311,634,453 302,553,916
EBP 154 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 29,625,703 29,163,338
EBP 170    
EBP, Master Trust [Line Items]    
Master Trust 2,004,104,428 1,791,966,388
EBP 170 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 311,634,453 302,553,916
EBP 170 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 282,008,750 273,390,578
Total US All Cap Equity Fund | EBP 154 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 271,689,064 268,756,769
Total US All Cap Equity Fund | EBP 154 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 22,058,438 22,691,401
Total US All Cap Equity Fund | EBP 170 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 271,689,064 268,756,769
Total US All Cap Equity Fund | EBP 170 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 249,630,626 246,065,368
Common stock | EBP 154 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 131,032,167 135,778,951
Common stock | EBP 154 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 10,638,503 11,463,952
Common stock | EBP 170 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 131,032,167 135,778,951
Common stock | EBP 170 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 120,393,665 124,314,999
Mutual funds | EBP 154 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 138,322,277 132,003,915
Mutual funds | EBP 154 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 11,230,387 11,145,222
Mutual funds | EBP 170 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 138,322,277 132,003,915
Mutual funds | EBP 170 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 127,091,890 120,858,693
Collective trusts | EBP 154 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 2,334,620 973,903
Collective trusts | EBP 154 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 189,548 82,227
Collective trusts | EBP 170 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 2,334,620 973,903
Collective trusts | EBP 170 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 2,145,071 891,676
Brunswick ESOP Company Stock Fund | EBP 154 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 39,945,389 33,797,147
Brunswick ESOP Company Stock Fund | EBP 154 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 7,567,265 6,471,937
Brunswick ESOP Company Stock Fund | EBP 170 | Master Trust    
EBP, Master Trust [Line Items]    
Master Trust 39,945,389 33,797,147
Brunswick ESOP Company Stock Fund | EBP 170 | Plan's Interest in Master Trust    
EBP, Master Trust [Line Items]    
Master Trust $ 32,378,124 $ 27,325,210