Fair Value Measurements - Recurring Fair Value Measurements (Details) - Fair Value, Inputs, Level 1 - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value Measurements
Restricted Cash Held in Trust	$ 315.5	$ 284.8
Short-Term Investments	12.7	1.3
Warrants, at fair value	$ 25.9	$ 80.9

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