Amortized Cost Basis for Finance Receivables that are on Non-accrual Status (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	$ 7.8	$ 3.1
Amortized cost basis with no specific reserve	17.3	6.1
Total	25.1	9.2
Customer Retail | Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	4.7	2.0
Amortized cost basis with no specific reserve	16.8	6.1
Total	21.5	8.1
Customer Retail | Owner/Oparator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	3.1	1.1
Amortized cost basis with no specific reserve	0.5
Total	$ 3.6	$ 1.1