Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 394.4	$ 386.2
Goodwill acquired and related adjustments	3.9
Currency translation effect on foreign goodwill balances	(2.6)	1.2
Goodwill, ending balance	395.7	387.4
Off Road
Goodwill [Roll Forward]
Goodwill, beginning balance	116.6	110.7
Goodwill acquired and related adjustments	0.4
Currency translation effect on foreign goodwill balances	(0.5)	(0.1)
Goodwill, ending balance	116.5	110.6
On Road
Goodwill [Roll Forward]
Goodwill, beginning balance	50.7	48.4
Currency translation effect on foreign goodwill balances	(2.1)	1.3
Goodwill, ending balance	48.6	49.7
Marine
Goodwill [Roll Forward]
Goodwill, beginning balance	227.1	227.1
Goodwill acquired and related adjustments	3.5
Currency translation effect on foreign goodwill balances	0.0	0.0
Goodwill, ending balance	$ 230.6	$ 227.1