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Marketable Securities (Detail) - Truck, Parts and Other - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | $ 1,742.1 |
Marketable debt securities, Fair Value | 1,687.6 |
Marketable equity securities, Cost | 10.0 | $ 10.0
Marketable equity securities, Unrealized Losses | 7.1 | 8.8
Marketable equity securities, Fair Value | 2.9 | 1.2
Total marketable securities, Cost | 1,752.1 | 1,681.1
Total marketable securities, Unrealized Gains | 0.3 | 0.9
Total marketable securities, Unrealized Losses | 61.9 | 67.8
Total marketable securities, Fair Value | 1,690.5 | 1,614.2
U.S. tax-exempt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 333.2 | 452.8
Marketable debt securities, Unrealized Gains | 0.1 | 0.5
Marketable debt securities, Unrealized Losses | 6.2 | 8.2
Marketable debt securities, Fair Value | 327.1 | 445.1
U.S. corporate securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 309.4 | 262.5
Marketable debt securities, Unrealized Gains | 0.1 | 0.1
Marketable debt securities, Unrealized Losses | 10.4 | 11.6
Marketable debt securities, Fair Value | 299.1 | 251.0
U.S. taxable municipal / non-U.S. provincial bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 230.2 | 191.6
Marketable debt securities, Unrealized Losses | 9.7 | 10.8
Marketable debt securities, Fair Value | 220.5 | 180.8
U.S. government and agency securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 150.6 | 118.0
Marketable debt securities, Unrealized Gains |  | 0.1
Marketable debt securities, Unrealized Losses | 4.0 | 3.1
Marketable debt securities, Fair Value | 146.6 | 115.0
Non-U.S. corporate securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 500.8 | 467.9
Marketable debt securities, Unrealized Losses | 16.9 | 17.9
Marketable debt securities, Fair Value | 483.9 | 450.0
Non-U.S. government securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 113.4 | 78.9
Marketable debt securities, Unrealized Gains | 0.1 | 0.2
Marketable debt securities, Unrealized Losses | 3.2 | 2.7
Marketable debt securities, Fair Value | 110.3 | 76.4
Other debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable debt securities, Cost | 104.5 | 99.4
Marketable debt securities, Unrealized Losses | 4.4 | 4.7
Marketable debt securities, Fair Value | $ 100.1 | $ 94.7

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