Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits (Details)

v3.8.0.1
Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jul. 01, 2017
 [1]
Apr. 01, 2017
 [1]
Dec. 31, 2016
 [1]
Oct. 01, 2016
 [1]
Jul. 02, 2016
 [1]
Apr. 02, 2016
 [1]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]                      
Defined Contribution Plan Expense                 $ 52.1 $ 46.3 $ 46.3
Settlement Loss $ 96.6 $ 0.0 $ 0.0 $ 0.0 $ 55.1 $ 0.0 $ 0.0 $ 0.0 96.6 [1] 55.1 [1] 82.3
Pension Plans [Member]                      
Defined Benefit Plan Disclosure [Line Items]                      
Settlement Payments                 234.4 125.2  
Settlement Loss                 96.6 55.1 82.3
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                 132.7 125.2  
Settlement Loss                   $ 55.1  
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    
Brunswick Pension Plan for Selected Current and Former Employees and the Brunswick Pension Plan for Salaried Employees [Member]                      
Defined Benefit Plan Disclosure [Line Items]                      
Settlement Payments                     191.8
Purchase of Group Annuity Contract                     (130.1)
Settlement Loss                     82.3
Lump Sum Payments                     $ 61.7
[1] (B) Pension settlement charges are discussed in Note 17 – Postretirement Benefits in the Notes to Consolidated Financial Statements.