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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest-Rate Contracts
Derivative [Line Items]
(Loss) gain recognized in OCI	$ (1.9)	$ (54.9)	$ (198.0)	$ 26.7
Foreign-exchange contracts
Derivative [Line Items]
(Loss) gain recognized in OCI	0.3	(4.5)	(57.0)	47.6
Commodity contracts
Derivative [Line Items]
(Loss) gain recognized in OCI	(1.1)	(0.6)	0.3	(13.6)
Truck, Parts and Other | Foreign-exchange contracts
Derivative [Line Items]
(Loss) gain recognized in OCI	3.4	0.1	(39.1)	47.1
Truck, Parts and Other | Commodity contracts
Derivative [Line Items]
(Loss) gain recognized in OCI	(1.1)	(0.6)	0.3	(13.6)
Financial Services | Interest-Rate Contracts
Derivative [Line Items]
(Loss) gain recognized in OCI	(1.9)	(54.9)	(198.0)	26.7
Financial Services | Foreign-exchange contracts
Derivative [Line Items]
(Loss) gain recognized in OCI	$ (3.1)	$ (4.6)	$ (17.9)	$ 0.5

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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