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Marketable Securities (Detail) - Truck, Parts and Other - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | $ 2,806.9 |
Marketable debt securities, Fair Value | 2,819.8 |
Marketable equity securities, Cost | 10.0 | $ 10.0
Marketable equity securities, Unrealized Losses | 3.3 | 3.7
Marketable equity securities, Fair Value | 6.7 | 6.3
Total marketable securities, Cost | 2,816.9 | 2,783.5
Total marketable securities, Unrealized Gains | 18.1 | 10.7
Total marketable securities, Unrealized Losses | 8.5 | 15.4
Total marketable securities, Fair Value | 2,826.5 | 2,778.8
U.S. tax-exempt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 296.6 | 304.5
Marketable debt securities, Unrealized Gains | 0.7 | 0.6
Marketable debt securities, Unrealized Losses | 0.5 | 1.4
Marketable debt securities, Fair Value | 296.8 | 303.7
U.S. taxable municipal / non-U.S. provincial bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 400.5 | 381.1
Marketable debt securities, Unrealized Gains | 2.7 | 1.2
Marketable debt securities, Unrealized Losses | 1.0 | 2.2
Marketable debt securities, Fair Value | 402.2 | 380.1
U.S. corporate securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 904.0 | 864.3
Marketable debt securities, Unrealized Gains | 6.1 | 3.1
Marketable debt securities, Unrealized Losses | 1.5 | 3.2
Marketable debt securities, Fair Value | 908.6 | 864.2
U.S. government securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 241.7 | 287.1
Marketable debt securities, Unrealized Gains | 1.1 | 0.1
Marketable debt securities, Unrealized Losses | 0.4 | 1.5
Marketable debt securities, Fair Value | 242.4 | 285.7
Non-U.S. corporate securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 605.5 | 606.6
Marketable debt securities, Unrealized Gains | 4.6 | 3.5
Marketable debt securities, Unrealized Losses | 0.9 | 2.0
Marketable debt securities, Fair Value | 609.2 | 608.1
Non-U.S. government securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 178.0 | 163.5
Marketable debt securities, Unrealized Gains | 1.7 | 1.4
Marketable debt securities, Unrealized Losses | 0.3 | 0.6
Marketable debt securities, Fair Value | 179.4 | 164.3
Other debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 180.6 | 166.4
Marketable debt securities, Unrealized Gains | 1.2 | 0.8
Marketable debt securities, Unrealized Losses | 0.6 | 0.8
Marketable debt securities, Fair Value | $ 181.2 | $ 166.4

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