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Pre-Tax Effects of (Loss) Gain on Cash Flow Hedges Recognized in OCI (Detail) - Derivative Contracts - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Interest-Rate Contracts |  |
Derivative [Line Items] |  |
(Loss) gain recognized in OCI | $ (72.0) | $ 24.7
Foreign-exchange contracts |  |
Derivative [Line Items] |  |
(Loss) gain recognized in OCI | (20.4) | 16.2
Commodity contracts |  |
Derivative [Line Items] |  |
(Loss) gain recognized in OCI | (0.2) | (4.6)
Truck, Parts and Other | Foreign-exchange contracts |  |
Derivative [Line Items] |  |
(Loss) gain recognized in OCI | (11.3) | 13.5
Truck, Parts and Other | Commodity contracts |  |
Derivative [Line Items] |  |
(Loss) gain recognized in OCI | (0.2) | (4.6)
Financial Services | Interest-Rate Contracts |  |
Derivative [Line Items] |  |
(Loss) gain recognized in OCI | (72.0) | 24.7
Financial Services | Foreign-exchange contracts |  |
Derivative [Line Items] |  |
(Loss) gain recognized in OCI | $ (9.1) | $ 2.7

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