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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

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as noncurrent.

+ References

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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