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Marketable Securities (Detail) - Truck, Parts and Other - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | $ 2,914.4 |
Marketable debt securities, Fair Value | 2,941.1 |
Marketable equity securities, Cost | 10.0 | $ 10.0
Marketable equity securities, Unrealized Losses | 4.6 | 3.7
Marketable equity securities, Fair Value | 5.4 | 6.3
Total marketable securities, Cost | 2,924.4 | 2,783.5
Total marketable securities, Unrealized Gains | 28.4 | 10.7
Total marketable securities, Unrealized Losses | 6.3 | 15.4
Total marketable securities, Fair Value | 2,946.5 | 2,778.8
U.S. tax-exempt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 331.2 | 304.5
Marketable debt securities, Unrealized Gains | 4.8 | 0.6
Marketable debt securities, Unrealized Losses | 0.1 | 1.4
Marketable debt securities, Fair Value | 335.9 | 303.7
U.S. taxable municipal / non-U.S. provincial bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 389.4 | 381.1
Marketable debt securities, Unrealized Gains | 4.2 | 1.2
Marketable debt securities, Unrealized Losses | 0.3 | 2.2
Marketable debt securities, Fair Value | 393.3 | 380.1
U.S. corporate securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 909.4 | 864.3
Marketable debt securities, Unrealized Gains | 8.7 | 3.1
Marketable debt securities, Unrealized Losses | 0.4 | 3.2
Marketable debt securities, Fair Value | 917.7 | 864.2
U.S. government securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 299.4 | 287.1
Marketable debt securities, Unrealized Gains | 2.0 | 0.1
Marketable debt securities, Unrealized Losses | 0.2 | 1.5
Marketable debt securities, Fair Value | 301.2 | 285.7
Non-U.S. corporate securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 596.0 | 606.6
Marketable debt securities, Unrealized Gains | 5.9 | 3.5
Marketable debt securities, Unrealized Losses | 0.3 | 2.0
Marketable debt securities, Fair Value | 601.6 | 608.1
Non-U.S. government securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 203.1 | 163.5
Marketable debt securities, Unrealized Gains | 1.2 | 1.4
Marketable debt securities, Unrealized Losses | 0.2 | 0.6
Marketable debt securities, Fair Value | 204.1 | 164.3
Other debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 185.9 | 166.4
Marketable debt securities, Unrealized Gains | 1.6 | 0.8
Marketable debt securities, Unrealized Losses | 0.2 | 0.8
Marketable debt securities, Fair Value | $ 187.3 | $ 166.4

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