Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value Measurements
Warrants, at fair value	$ 16.3	$ 25.9
Fair Value, Inputs, Level 1
Fair Value Measurements
Restricted Cash Held in Trust	323.3	315.5
Fair Value, Inputs, Level 2
Fair Value Measurements
Short-Term Investments	$ 7.7	$ 12.7

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