Amortized Cost Basis for Finance Receivables that are on Non-accrual Status (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	$ 10.0	$ 3.1
Amortized cost basis with no specific reserve	6.1	6.1
Total	16.1	9.2
Customer Retail | Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	8.2	2.0
Amortized cost basis with no specific reserve	5.3	6.1
Total	13.5	8.1
Customer Retail | Owner/Operator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	1.8	1.1
Amortized cost basis with no specific reserve	0.8
Total	$ 2.6	$ 1.1