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

Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Term of derivative instruments, lower range (in months)	1 month
Term of derivative instruments, upper range (in months)	20 months
Foreign Exchange Contract [Member]
Derivative [Line Items]
Amount of gain (loss) estimated to be reclassified from accumulated other comprehensive loss to cost of sales or interest expense	$ (1.5)
Foreign Exchange Contract [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Notional values	75.1	112.1
Foreign Exchange Contract [Member] \| Options Held [Member]
Derivative [Line Items]
Notional values	135.6	106.8
Commodity Contract [Member]
Derivative [Line Items]
Notional values	31.3	27.1
Amount of gain (loss) estimated to be reclassified from accumulated other comprehensive loss to cost of sales or interest expense	(4.1)
Interest Rate Contract [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Notional values	100.0	50.0
Amount of net deferred gain (loss) associated with all forward starting interest rate swaps included in accumulated other comprehensive income	(2.9)	0.5
Amount of gain (loss) estimated to be reclassified from accumulated other comprehensive loss to cost of sales or interest expense	0.9
Notional value of terminated forward starting interest rate swaps	250.0
Notional value of terminated forward starting interest rate swaps	$ 150.0