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Amortized Cost Basis of Finance Receivables Modified by Portfolio Class (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable Modifications [Line Items]
Amortized cost basis of finance receivables			$ 250.1	$ 189.0
Customer Retail
Financing Receivable Modifications [Line Items]
Amortized cost basis of finance receivables	$ 91.2	$ 7.8	$ 132.1	$ 106.8
Financing receivable modifications percentage	2.40%	0.20%	1.10%	1.00%
Customer Retail | Fleet
Financing Receivable Modifications [Line Items]
Amortized cost basis of finance receivables	$ 87.1	$ 7.8	$ 127.7	$ 106.4
Customer Retail | Owner/Operator
Financing Receivable Modifications [Line Items]
Amortized cost basis of finance receivables	$ 4.1		$ 4.4	$ 0.4

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- Definition

Financing receivable modifications percentage.

+ References

No definition available.

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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

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