Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits (Details)

v3.20.4
Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 26, 2020
 [1]
Jun. 27, 2020
 [1]
Mar. 28, 2020
Dec. 31, 2019
 [1]
Sep. 28, 2019
 [1]
Jun. 29, 2019
Mar. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]                      
Defined Contribution Plan Expense                 $ 49.4 $ 44.1 $ 45.3
Settlement Loss $ 0.0 $ 0.2 $ (1.3) $ 0.0 $ (1.3) $ 294.1 $ 0.0 $ 0.0 (1.1) [1] 292.8 [1] 0.0
Pension Plans [Member]                      
Defined Benefit Plan Disclosure [Line Items]                      
Settlement Payments                 0.0 673.9  
Settlement Loss                 (1.1) 292.8 0.0
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  
[1] (D) Pension settlement charges are discussed in Note 17 – Postretirement Benefits