Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Goodwill [Roll Forward]
Beginning balance			$ 393.5	$ 394.4
Goodwill impairment	$ (52.6)	$ 0.0	(52.6)	0.0
Goodwill acquired and related adjustments				3.9
Currency translation effect on foreign goodwill balances			7.7	(2.6)
Ending balance	348.6	395.7	348.6	395.7
Off Road
Goodwill [Roll Forward]
Beginning balance			116.2	116.6
Goodwill impairment			0.0
Goodwill acquired and related adjustments				0.4
Currency translation effect on foreign goodwill balances			1.8	(0.5)
Ending balance	118.0	116.5	118.0	116.5
On Road
Goodwill [Roll Forward]
Beginning balance			46.7	50.7
Goodwill impairment			(52.6)
Goodwill acquired and related adjustments				0.0
Currency translation effect on foreign goodwill balances			5.9	(2.1)
Ending balance	0.0	48.6	0.0	48.6
Marine
Goodwill [Roll Forward]
Beginning balance			230.6	227.1
Goodwill impairment			0.0
Goodwill acquired and related adjustments				3.5
Currency translation effect on foreign goodwill balances			0.0	0.0
Ending balance	$ 230.6	$ 230.6	$ 230.6	$ 230.6