Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits (Details)

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Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
 [1]
Sep. 28, 2019
 [1]
Jun. 29, 2019
Mar. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]              
Defined Contribution Plan Expense         $ 44.1 $ 45.3 $ 42.2
Settlement Loss $ 1.3 $ (294.1) $ 0.0 $ 0.0 292.8 [1] 0.0 96.6
Pension Plans [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Settlement Payments         673.9 0.0  
Settlement Loss         292.8 0.0 96.6
Other Postretirement Benefit Plans [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Settlement Payments         0.0 0.0  
Settlement Loss         0.0 0.0 0.0
Brunswick Pension Plan For Salaried Employees and Brunswick Pension Plan For Hourly Bargaining Unit Employees [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Settlement Payments         673.9    
Settlement Loss         292.8    
Defined Benefit Plan Lump Sum Payment         77.1    
Defined Benefit Plan, Purchase of Group Annuity Contract         $ 596.8    
Brunswick Pension Plan For Hourly Bargaining Unit Employees and the Brunswick Pension Plan For Salaried Employees [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Settlement Payments             132.7
Brunswick Pension Plan For Hourly Employees and the Brunswick Pension Plan For Hourly Wage Employees [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Settlement Payments             101.7
Bargaining Plan, Salaried Plan, Hourly Plan and Muskegon Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Settlement Loss             $ 96.6
Total Pension Plan Net Assets [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount           $ 642.0  
[1]
(D) Pension settlement charges are discussed in Note 17 – Postretirement Benefits.