Amortized Cost Basis for Finance Receivables that are on Non-accrual Status (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	$ 13.8	$ 15.0
Amortized cost basis with no specific reserve	1.3	3.7
Total	15.1	18.7
Customer Retail | Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	13.0	14.2
Amortized cost basis with no specific reserve	1.3	3.7
Total	14.3	17.9
Customer Retail | Owner Operator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amortized cost basis with a specific reserve	0.8	0.8
Total	$ 0.8	$ 0.8