v3.26.1
Summary of Amortized Cost Basis of Financing Receivables by Aging Category (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due $ 10,840.8 $ 11,058.1
Current and up to 30 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 10,681.9 10,892.0
31 - 60 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 54.0 80.1
Greater than 60 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 104.9 86.0
Dealer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 4,484.0 4,648.4
Dealer | Wholesale    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 2,330.4 2,440.8
Dealer | Wholesale | Current and up to 30 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 2,330.4 2,440.8
Dealer | Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 2,153.6 2,207.6
Dealer | Retail | Current and up to 30 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 2,153.6 2,207.6
Customer Retail    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 6,356.8 6,409.7
Customer Retail | Fleet    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 5,747.2 5,808.3
Customer Retail | Fleet | Current and up to 30 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 5,600.2 5,657.6
Customer Retail | Fleet | 31 - 60 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 47.4 71.0
Customer Retail | Fleet | Greater than 60 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 99.6 79.7
Customer Retail | Owner/Operator    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 609.6 601.4
Customer Retail | Owner/Operator | Current and up to 30 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 597.7 586.0
Customer Retail | Owner/Operator | 31 - 60 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due 6.6 9.1
Customer Retail | Owner/Operator | Greater than 60 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, past due $ 5.3 $ 6.3