Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Intangible Assets by Major Class [Line Items]
Total other intangible assets, net	$ 537.1	$ 542.7
Accumulated amortization	(125.0)	(119.0)
Total other intangible assets, net	$ 662.1	$ 661.7
Weighted-average useful life (years)	18 years	18 years
Amortizable - dealer/customer related
Intangible Assets by Major Class [Line Items]
Cost	$ 341.2	$ 341.2
Accumulated amortization	(119.2)	(114.8)
Net	$ 222.0	$ 226.4
Weighted-average useful life (years)	19 years	19 years
Technology-Based Intangible Assets
Intangible Assets by Major Class [Line Items]
Cost	$ 62.7	$ 62.7
Accumulated amortization	(5.8)	(4.2)
Net	$ 56.9	$ 58.5
Weighted-average useful life (years)	10 years	10 years
Non-amortizable - brand/trade names
Intangible Assets by Major Class [Line Items]
Non-amortizable—brand/trade names	$ 258.2	$ 257.8