Amortized Cost Basis of Finance Receivables Modified by Portfolio Class (Detail) - Customer Retail - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 72.1	$ 29.2	$ 227.9	$ 40.9
Amortized cost basis of finance receivables			$ 345.4	$ 129.1
Financing receivable modifications percentage	1.90%	0.80%	2.90%	0.50%
Fleet
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 71.8	$ 29.0	$ 227.0	$ 40.6
Owner/Operator
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 0.3	$ 0.2	$ 0.9	$ 0.3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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