Amortized Cost Basis for Finance Receivables that are on Non-accrual Status (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	$ 113.5	$ 10.0
Amortized cost basis with no specific reserve	5.7	6.1
Total	119.2	16.1
Customer Retail | Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	110.7	8.2
Amortized cost basis with no specific reserve	4.6	5.3
Total	115.3	13.5
Customer Retail | Owner/Oparator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	2.8	1.8
Amortized cost basis with no specific reserve	1.1	0.8
Total	$ 3.9	$ 2.6