Amortized Cost Basis of Finance Receivables Modified by Portfolio Class (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Financing Receivable Modifications [Line Items] | ||||
| Amortized cost basis of finance receivables | $ 141.6 | $ 134.2 | ||
| Customer Retail | ||||
| Financing Receivable Modifications [Line Items] | ||||
| Amortized cost basis of finance receivables | $ 29.2 | $ 83.5 | $ 40.9 | $ 90.0 |
| Financing receivable modifications percentage | 0.80% | 2.50% | 0.50% | 1.30% |
| Customer Retail | Fleet | ||||
| Financing Receivable Modifications [Line Items] | ||||
| Amortized cost basis of finance receivables | $ 29.0 | $ 83.2 | $ 40.6 | $ 89.6 |
| Customer Retail | Owner/Operator | ||||
| Financing Receivable Modifications [Line Items] | ||||
| Amortized cost basis of finance receivables | $ 0.2 | $ 0.3 | $ 0.3 | $ 0.4 |