Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Intangible Assets by Major Class [Line Items]
Weighted-average useful life (years)	18 years
Accumulated amortization	$ (113.0)
Total other intangible assets, net	672.0		$ 609.2
Total other intangible assets, net	$ 559.0		$ 512.0
Amortizable - dealer/customer related
Intangible Assets by Major Class [Line Items]
Weighted-average useful life (years)	19 years		19 years
Cost	$ 341.1		$ 341.2
Accumulated amortization	(110.4)		(97.2)
Net	$ 230.7		244.0
Amortizable - developed technology
Intangible Assets by Major Class [Line Items]
Weighted-average useful life (years)	10 years
Cost		$ 62.7
Accumulated amortization	$ (2.6)
Net	60.1
Non-amortizable - brand/trade names
Intangible Assets by Major Class [Line Items]
Non-amortizable—brand/trade names	$ 268.2		$ 268.0