Brunswick Corporation Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Dec. 31, 2012	Mar. 31, 2012
Derivative [Line Items]
Term of derivative instruments, lower range (in months)	1 month
Term of derivative instruments, upper range (in months)	23 months
Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of gain (loss) estimated to be reclassified from accumulated other comprehensive loss to cost of sales or interest expense	$ (2.3)
Foreign exchange contracts [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Notional values	109.1	116.0
Foreign exchange contracts [Member] \| Options Held [Member]
Derivative [Line Items]
Notional values	72.8	69.7
Interest rate contracts [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Notional values	100.0	100.0
Amount of gain (loss) estimated to be reclassified from accumulated other comprehensive loss to cost of sales or interest expense	1.3
Amount of net deferred losses associated with all forward starting interest rate swaps included in accumulated other comprehensive income	(3.0)		(3.7)
Notional value of terminated forward starting interest rate swaps	250.0
Notional value of terminated forward starting interest rate swaps	150.0
Commodity contracts [Member]
Derivative [Line Items]
Notional values	26.8	26.0
Amount of gain (loss) estimated to be reclassified from accumulated other comprehensive loss to cost of sales or interest expense	$ (1.3)