Brunswick Corporation Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits Postretirement Benefits - Additional Information (Details)

Postretirement Benefits Postretirement Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate for next year	5.80%	7.10%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Year rate reaches the ultimate trend rate	2037	2028
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect on total service and interest cost, increase	$ 0.0
Effect on accumulated postretirement benefit obligation, increase	0.1
Effect on total service and interest cost, decrease	0.0
Effect on accumulated postretirement benefit obligation, decrease	$ (0.1)
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Total	100.00%	100.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Total	100.00%
Pension Plans [Member]
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Actuarial Loss Related to Change in Mortality Assumptions	$ 59.0
Defined Benefit Plan, Weighted average assumptions used to determine pension and other postretirement benefit obligations [Abstract]
Discount rate	4.40%	3.95%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.95%	4.85%	4.00%
Long-term rate of return on plan assets	6.00%	6.25%	6.50%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Actuarial Loss Related to Change in Mortality Assumptions	$ 2.0
Defined Benefit Plan, Weighted average assumptions used to determine pension and other postretirement benefit obligations [Abstract]
Discount rate	4.23%	3.75%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.75%	4.40%	3.60%
United States Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Total	17.00%	17.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Total	17.00%
International Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Total	3.00%	3.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Total	3.00%
Fixed Income Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Total	77.00%	66.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Total	80.00%
Short-term Investments [Member]
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Total	3.00%	14.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Total	0.00%