Quarterly report pursuant to Section 13 or 15(d)

Postretirement Benefits (Details)

v3.20.2
Postretirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Defined Benefit Plan Disclosure [Line Items]        
Settlement Loss $ 200,000 $ 294,100,000 $ (1,100,000) $ 294,100,000
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest Cost 200,000 700,000 500,000 5,900,000
Expected Return on Plan Assets 0 (600,000) 0 (7,400,000)
Amortization of Prior Service Credits 0 0 0 0
Amortization of Net Actuarial Losses 100,000 600,000 400,000 5,700,000
Settlement Loss 200,000 294,100,000 (1,100,000) 294,100,000
Net Pension and Other Benefit Costs 500,000 294,800,000 (200,000) 298,300,000
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest Cost 200,000 300,000 600,000 900,000
Expected Return on Plan Assets 0 0 0 0
Amortization of Prior Service Credits (200,000) (100,000) (500,000) (500,000)
Amortization of Net Actuarial Losses 0 0 0 0
Settlement Loss 0 0 0 0
Net Pension and Other Benefit Costs 0.0 $ 200,000 100,000 400,000
Brunswick Pension Plan For Salaried Employees and Brunswick Pension Plan For Hourly Bargaining Unit Employees [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Lump Sum Payment       77,100,000
Defined Benefit Plan, Purchase of Group Annuity Contract       595,800,000
Settlement Loss $ 200,000   $ (1,100,000) 294,100,000
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement       $ 672,900,000