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Fair Value - Recurring Fair Value Measurements (Details) - Recurring fair value measurements - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
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