v3.25.2
Balance Sheet Classifications, Fair Value, Gross and Pro Forma Net Amounts of Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
ASSETS    
Derivative assets $ 56.4 $ 207.0
Pro forma net amount $ 42.1 $ 194.7
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Assets Assets
LIABILITIES    
Derivative liabilities $ 234.7 $ 46.7
Pro forma net amount $ 220.4 $ 34.4
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Liabilities Liabilities
Interest-Rate Contracts | Financial Services    
ASSETS    
Less amounts not offset in financial instruments $ (13.1) $ (11.4)
LIABILITIES    
Less amounts not offset in financial instruments (13.1) (11.4)
Foreign-exchange contracts | Truck, Parts and Other    
ASSETS    
Less amounts not offset in financial instruments (1.2) (0.9)
LIABILITIES    
Less amounts not offset in financial instruments (1.2) (0.9)
Designated under hedge accounting    
ASSETS    
Derivative assets 55.9 205.6
LIABILITIES    
Derivative liabilities 233.3 44.1
Designated under hedge accounting | Interest-Rate Contracts | Financial Services | Other Assets    
ASSETS    
Derivative assets 46.6 132.2
Designated under hedge accounting | Interest-Rate Contracts | Financial Services | Deferred Taxes and Other Liabilities    
LIABILITIES    
Derivative liabilities 132.2 41.1
Designated under hedge accounting | Foreign-exchange contracts | Financial Services | Other Assets    
ASSETS    
Derivative assets   5.8
Designated under hedge accounting | Foreign-exchange contracts | Financial Services | Deferred Taxes and Other Liabilities    
LIABILITIES    
Derivative liabilities 4.1  
Designated under hedge accounting | Foreign-exchange contracts | Truck, Parts and Other | Other current assets    
ASSETS    
Derivative assets 9.1 67.6
Designated under hedge accounting | Foreign-exchange contracts | Truck, Parts and Other | Accounts payable, accrued expenses and other    
LIABILITIES    
Derivative liabilities 96.6 3.0
Designated under hedge accounting | Commodity contracts | Truck, Parts and Other | Other current assets    
ASSETS    
Derivative assets 0.2  
Designated under hedge accounting | Commodity contracts | Truck, Parts and Other | Accounts payable, accrued expenses and other    
LIABILITIES    
Derivative liabilities 0.4  
Not designated as hedging instruments    
ASSETS    
Derivative assets 0.5 1.4
LIABILITIES    
Derivative liabilities 1.4 2.6
Not designated as hedging instruments | Foreign-exchange contracts | Financial Services | Other Assets    
ASSETS    
Derivative assets 0.1 0.2
Not designated as hedging instruments | Foreign-exchange contracts | Financial Services | Deferred Taxes and Other Liabilities    
LIABILITIES    
Derivative liabilities 0.1 0.2
Not designated as hedging instruments | Foreign-exchange contracts | Truck, Parts and Other | Other current assets    
ASSETS    
Derivative assets 0.4 1.2
Not designated as hedging instruments | Foreign-exchange contracts | Truck, Parts and Other | Accounts payable, accrued expenses and other    
LIABILITIES    
Derivative liabilities $ 1.3 $ 2.4