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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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