Pre- and Post-Modification Amortized Cost Basis Balances for Finance Receivables Modified by Portfolio Class (Detail) - Financial Services - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	$ 8.1	$ 74.7
Post-Modification, Amortized Cost Basis	8.0	74.7
Customer Retail | Fleet
Financing Receivable, Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	7.1	72.5
Post-Modification, Amortized Cost Basis	7.0	72.5
Customer Retail | Owner/Operator
Financing Receivable, Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	1.0	2.2
Post-Modification, Amortized Cost Basis	$ 1.0	$ 2.2