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Contractual Maturities of Marketable Debt Securities (Detail) - Truck, Parts and Other $ in Millions	Sep. 30, 2025 USD ($)
Amortized Cost Maturities:
Within one year	$ 549.0
One to five years	2,362.0
Six to ten years	0.8
More than ten years	2.6
Marketable debt securities, Cost	2,914.4
Fair Value Maturities:
Within one year	550.6
One to five years	2,387.3
Six to ten years	0.8
More than ten years	2.4
Fair Value	$ 2,941.1

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