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Fair Value - Recurring Fair Value Measurements (Details) - Recurring fair value measurements - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Level 1 inputs |  |
Fair Value, Assets Measured on Recurring Basis |  |
Fair value of equity investment in TuSimple | $ 0.1 | $ 0.3
Level 2 inputs |  |
Fair Value, Assets Measured on Recurring Basis |  |
Fair value of marketable securities | $ 52.6 | $ 57.2

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