Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits (Details)

v3.10.0.1
Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
 [1]
Jul. 01, 2017
 [1]
Apr. 01, 2017
 [1]
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]              
Defined Contribution Plan Expense         $ 54.3 $ 52.1 $ 46.3
Settlement Loss $ 96.6 [1] $ 0.0 $ 0.0 $ 0.0 0.0 96.6 [1] 55.1
Pension Plans [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Settlement Payments         0.0 234.4  
Settlement Loss         0.0 96.6 55.1
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 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  
Total Pension Plan Net Assets [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount $ 546.1       $ 642.0 $ 546.1  
[1] (I) Pension settlement charges are discussed in Note 18 – Postretirement Benefits.