Amortized Cost Basis of Finance Receivables Modified by Portfolio Class (Detail) - Customer Retail - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 120.4	$ 91.2	$ 289.3	$ 132.1
Amortized cost basis of finance receivables			$ 342.1	$ 202.9
Financing receivable modifications percentage	3.10%	2.40%	2.50%	1.10%
Fleet
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 117.8	$ 87.1	$ 285.8	$ 127.7
Owner/Operator
Financing Receivable, Modified [Line Items]
Amortized cost basis of finance receivables	$ 2.6	$ 4.1	$ 3.5	$ 4.4

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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