Changes in Product Support Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
WARRANTY RESERVES
Beginning balance	$ 437.7	$ 344.3
Cost accruals	484.1	269.4
Payments	(459.9)	(302.9)
Change in estimates for pre-existing warranties	186.1	80.6
Currency translation and other	(2.6)	(23.2)
Ending balance	645.4	368.2
DEFERRED REVENUES ON EXTENDED WARRANTIES AND R&M CONTRACTS
Beginning balance	904.9	775.2
Deferred revenues	583.5	439.7
Revenues recognized	(339.7)	(352.7)
Currency translation	(5.4)	(56.7)
Ending balance	$ 1,143.3	$ 805.5