Pre- and Post-Modification Amortized Cost Basis Balances for Finance Receivables Modified by Portfolio Class (Detail) - Financial Services - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Modifications [Line Items]
Pre-Modification, Amortized Cost Basis		$ 1.0		$ 6.8
Post-Modification, Amortized Cost Basis		1.0		6.7
Customer Retail | Fleet
Financing Receivable, Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	$ 1.6	1.0	$ 9.7	5.8
Post-Modification, Amortized Cost Basis	$ 1.6	$ 1.0	$ 9.7	5.7
Customer Retail | Owner/Operator
Financing Receivable, Modifications [Line Items]
Pre-Modification, Amortized Cost Basis				1.0
Post-Modification, Amortized Cost Basis				$ 1.0