Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net Sales	$ 1,443.9	$ 1,702.3	$ 2,808.9	$ 3,445.9
Operating Income (Loss)	158.3	194.4	268.9	430.5
Total Assets	6,395.7	6,290.1	6,395.7	6,290.1	$ 6,230.5
Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Sales	(94.5)	(118.5)	(206.7)	(267.6)
Operating Income (Loss)	0.0	0.0	0.0	0.0
Propulsion [Member]
Segment Reporting Information [Line Items]
Total Assets	1,742.4	1,621.7	1,742.4	1,621.7	1,648.7
Propulsion [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	558.0	703.3	1,136.2	1,454.9
Operating Income (Loss)	85.6	111.1	168.4	262.2
Boat [Member]
Segment Reporting Information [Line Items]
Total Assets	891.8	886.9	891.8	886.9	874.8
Boat [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	434.2	560.8	859.9	1,136.0
Operating Income (Loss)	24.8	53.2	54.2	111.0
Corporate/Other [Member]
Segment Reporting Information [Line Items]
Total Assets	896.6	784.0	896.6	784.0	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)	(24.7)	(40.5)	(57.1)	(73.9)
Engine Parts and Accessories [Member]
Segment Reporting Information [Line Items]
Total Assets	869.9	883.6	869.9	883.6	855.6
Engine Parts and Accessories [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	336.1	328.9	598.5	617.5
Operating Income (Loss)	75.6	66.4	108.8	114.2
Navico Group
Segment Reporting Information [Line Items]
Total Assets	1,995.0	2,113.9	1,995.0	2,113.9	$ 2,074.3
Navico Group | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	210.1	227.8	421.0	505.1
Operating Income (Loss)	$ (3.0)	$ 4.2	$ (5.4)	$ 17.0