Goodwill and Intangibles Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Jun. 28, 2025	Sep. 27, 2025	Sep. 28, 2024	Dec. 31, 2024	Jun. 29, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Acquisitions				$ (305.8)	$ 28.2
Goodwill, Impaired, Accumulated Impairment Loss			$ 0.0			$ 0.0	$ 0.0
Goodwill, Other Increase (Decrease)				19.3	0.8
Goodwill	$ 679.6	$ 1,059.7		679.6	1,059.7	966.1		$ 1,030.7
Amortization Expense for Intangibles	19.7	18.2		59.0	54.0
Goodwill, Purchase Accounting Adjustments					1.6
Propulsion [Member]
Goodwill [Roll Forward]
Acquisitions				0.0	0.0
Goodwill, Other Increase (Decrease)				2.8	(0.1)
Goodwill	53.6	54.0		53.6	54.0	50.8		54.1
Boat [Member]
Goodwill [Roll Forward]
Acquisitions				0.0	28.2
Goodwill, Other Increase (Decrease)				0.8	(1.0)
Goodwill	170.1	171.1		170.1	171.1	169.3		143.9
Navico Group
Goodwill [Roll Forward]
Acquisitions				(305.8)	0.0
Goodwill, Impaired, Accumulated Impairment Loss	385.8			385.8		80.0
Goodwill, Other Increase (Decrease)				15.1	1.9
Goodwill	222.7	601.6		222.7	601.6	513.4		599.7
Engine Parts and Accessories [Member]
Goodwill [Roll Forward]
Acquisitions				0.0	0.0
Goodwill, Other Increase (Decrease)				0.6	0.0
Goodwill	$ 233.2	$ 233.0		$ 233.2	$ 233.0	$ 232.6		$ 233.0
Customer Relationships [Member]
Goodwill [Roll Forward]
Finite-Lived Intangible Asset, Weighted Average Remaining Useful Life			13 years 3 months 18 days
Other Intangible Assets [Member]
Goodwill [Roll Forward]
Finite-Lived Intangible Asset, Weighted Average Remaining Useful Life			11 years 8 months 12 days