Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Intangible Assets by Major Class [Line Items]
Total other intangible assets, net	$ 507.3	$ 512.0
Total other intangible assets, net	608.9	609.2
Amortizable - dealer/customer related
Intangible Assets by Major Class [Line Items]
Cost	341.2	341.2
Accumulated amortization	(101.6)	(97.2)
Net	$ 239.6	$ 244.0
Weighted-average useful life (years)	19 years	19 years
Non-amortizable - brand/trade names
Intangible Assets by Major Class [Line Items]
Non-amortizable—brand/trade names	$ 267.7	$ 268.0