Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Intangible Assets by Major Class [Line Items]
Accumulated Amortization	$ (97.2)	$ (80.0)	$ (74.8)
Total other intangible assets, Gross Carrying Amount	609.2	604.4	$ 618.7
Total other intangible assets, net	512.0	524.4
Amortizable - dealer/customer related
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	341.2	341.7
Accumulated Amortization	(97.2)	(80.0)
Net	$ 244.0	$ 261.7
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	$ 268.0	$ 262.7
Non-amortizable, Net	$ 268.0	$ 262.7