v3.10.0.1
Document And Entity Information - shares
9 Months Ended
Sep. 29, 2018
Oct. 29, 2018
Entity Information Line Items [Abstract]    
Entity Registrant Name BRUNSWICK CORP  
Entity Central Index Key 0000014930  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   86,740,007
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 29, 2018