Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 450.1	$ 472.8
Accumulated Amortization	(134.0)	(120.7)	$ (126.5)
Net	316.1	352.1
Total other intangible assets, Gross Carrying Amount	780.2	807.1	$ 956.8
Total other intangible assets, net	$ 646.2	$ 686.4
Weighted-average useful life (years)	17 years	16 years
Non-compete agreements
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 2.6	$ 2.6
Accumulated Amortization	(2.3)	(1.6)
Net	$ 0.3	$ 1.0
Weighted-average useful life (years)	4 years	4 years
Dealer/customer related
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 437.6	$ 460.3
Accumulated Amortization	(121.9)	(110.8)
Net	$ 315.7	$ 349.5
Weighted-average useful life (years)	17 years	17 years
Developed technology
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 9.9	$ 9.9
Accumulated Amortization	(9.8)	(8.3)
Net	$ 0.1	$ 1.6
Weighted-average useful life (years)	5 years	5 years
Non-amortizable—brand/trade names
Intangible Assets by Major Class [Line Items]
Non-amortizable—brand/trade names	$ 330.1	$ 334.3
Non-amortizable, Net	$ 330.1	$ 334.3