v3.25.2
Contractual Maturities of Marketable Debt Securities (Detail) - Truck, Parts and Other
$ in Millions
Jun. 30, 2025
USD ($)
Amortized Cost Maturities:  
Within one year $ 573.7
One to five years 2,306.7
Six to ten years 0.7
More than ten years 4.9
Marketable debt securities, Cost 2,886.0
Fair Value Maturities:  
Within one year 574.8
One to five years 2,328.6
Six to ten years 0.7
More than ten years 4.4
Fair Value $ 2,908.5