Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 394.4	$ 386.2
Goodwill acquired and related adjustments	3.9	4.2
Currency translation effect on foreign goodwill balances	0.8	(1.0)
Goodwill, ending balance	399.1	389.4
Off Road
Goodwill [Roll Forward]
Goodwill, beginning balance	116.6	110.7
Goodwill acquired and related adjustments	0.4
Goodwill acquired and related adjustments		4.2
Currency translation effect on foreign goodwill balances		(0.3)
Goodwill, ending balance	117.0	114.6
On Road
Goodwill [Roll Forward]
Goodwill, beginning balance	50.7	48.4
Currency translation effect on foreign goodwill balances	0.8	(0.7)
Goodwill, ending balance	51.5	47.7
Marine
Goodwill [Roll Forward]
Goodwill, beginning balance	227.1	227.1
Goodwill acquired and related adjustments	3.5
Goodwill, ending balance	$ 230.6	$ 227.1