Amortized Cost Basis of Finance Receivables Modified by Portfolio Class (Detail) - Customer Retail - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable Modifications [Line Items]
Amortized cost basis of finance receivables	$ 83.5	$ 0.6	$ 90.0	$ 6.6
Financing receivable modifications percentage	2.50%	0.10%	1.30%	0.10%
Fleet
Financing Receivable Modifications [Line Items]
Amortized cost basis of finance receivables	$ 83.2	$ 0.6	$ 89.6	$ 6.6
Owner/Operator
Financing Receivable Modifications [Line Items]
Amortized cost basis of finance receivables	$ 0.3		$ 0.4