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v3.25.1

Schedule of Revenues by Major Sources (Detail) - Truck, Parts and Other - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | $ 6,913.7 | $ 8,235.0
Trucks |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | 5,225.8 | 6,541.0
Trucks | Truck Sales |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | 4,971.7 | 6,304.7
Trucks | Revenues from extended warranties, operating leases and other |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | 254.1 | 236.3
Parts Subsegment |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | 1,689.9 | 1,675.9
Parts Subsegment | Parts |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | 1,637.6 | 1,625.6
Parts Subsegment | Revenues from dealer services and other |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | 52.3 | 50.3
Intersegment Eliminations and Other |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Total sales and revenues | $ (2.0) | $ 18.1

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