Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net Sales	$ 1,273.3	$ 1,593.6	$ 4,082.2	$ 5,039.5
Operating Income (Loss)	98.4	196.1	367.3	626.6
Total Assets	6,023.5	6,100.9	6,023.5	6,100.9	$ 6,230.5
Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Sales	(78.1)	(111.2)	(284.8)	(378.8)
Operating Income (Loss)	0.0	0.0	0.0	0.0
Propulsion [Member]
Segment Reporting Information [Line Items]
Total Assets	1,654.5	1,654.3	1,654.5	1,654.3	1,648.7
Propulsion [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	485.9	718.2	1,622.1	2,173.1
Operating Income (Loss)	50.1	129.2	218.5	391.4
Boat [Member]
Segment Reporting Information [Line Items]
Total Assets	917.5	867.6	917.5	867.6	874.8
Boat [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	345.3	428.6	1,205.2	1,564.6
Operating Income (Loss)	(0.1)	20.3	54.1	131.3
Corporate/Other [Member]
Segment Reporting Information [Line Items]
Total Assets	602.4	615.4	602.4	615.4	777.1
Corporate/Other [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	0.0	0.0	0.0	0.0
Operating Income (Loss)	(29.2)	(31.1)	(86.3)	(105.0)
Engine Parts and Accessories [Member]
Segment Reporting Information [Line Items]
Total Assets	849.3	857.2	849.3	857.2	855.6
Engine Parts and Accessories [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	336.1	344.6	934.6	962.1
Operating Income (Loss)	86.3	75.0	195.1	189.2
Navico Group
Segment Reporting Information [Line Items]
Total Assets	1,999.8	2,106.4	1,999.8	2,106.4	$ 2,074.3
Navico Group | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	184.1	213.4	605.1	718.5
Operating Income (Loss)	$ (8.7)	$ 2.7	$ (14.1)	$ 19.7