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Amount of Loss (Gain) from Derivative Financial Instruments Recorded in Consolidated Statements of Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Interest-Rate Contracts |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | $ 1.0 | $ 56.5 | $ 177.9 | $ (5.3)
Interest-Rate Contracts | Financial Services | Interest and other borrowing expenses |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | 1.0 | 56.5 | 177.9 | (5.3)
Foreign-exchange contracts |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | (4.0) | (5.2) | 32.9 | (34.1)
Foreign-exchange contracts | Truck, Parts and Other |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | (6.4) | (15.9) | 17.8 | (42.0)
Foreign-exchange contracts | Truck, Parts and Other | Cost of sales and revenues | Not designated as hedging instruments |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | (1.3) | (0.3) | (1.7) | (0.1)
Foreign-exchange contracts | Truck, Parts and Other | Interest and other (income) expenses, net | Not designated as hedging instruments |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | (1.7) | (2.4) | 6.1 | (9.9)
Foreign-exchange contracts | Financial Services | Interest and other borrowing expenses |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | 2.4 | 10.7 | 15.1 | 7.9
Foreign-exchange contracts | Financial Services | Interest and other borrowing expenses | Not designated as hedging instruments |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | (0.7) | 6.7 | (0.8) | 8.9
Cash Flow Hedging | Interest-Rate Contracts | Financial Services | Interest and other borrowing expenses |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | 0.5 | 54.4 | 176.0 | (12.5)
Cash Flow Hedging | Foreign-exchange contracts | Truck, Parts and Other | Net sales and revenues |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | 1.1 | (11.4) | 5.1 | (2.2)
Cash Flow Hedging | Foreign-exchange contracts | Truck, Parts and Other | Cost of sales and revenues |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | (12.2) | (3.9) | (23.0) | (28.8)
Cash Flow Hedging | Foreign-exchange contracts | Truck, Parts and Other | Interest and other (income) expenses, net |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | 10.8 | 4.2 | 41.0 | 6.7
Cash Flow Hedging | Foreign-exchange contracts | Financial Services | Interest and other borrowing expenses |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | 3.1 | 4.0 | 15.9 | (1.0)
Net Investment Hedging | Foreign-exchange contracts | Truck, Parts and Other | Interest and other (income) expenses, net |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | (3.1) | (2.1) | (9.7) | (7.7)
Fair Value Hedging | Interest-Rate Contracts | Financial Services | Interest and other borrowing expenses |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivatives designated as hedging instruments loss (gain) | $ 0.5 | $ 2.1 | $ 1.9 | $ 7.2

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- Definition Line items represent financial concepts included in a table. 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