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Fair Value Measurements - Changes in Forward Contract Liability (Details) - Forward Contracts
$ in Millions
6 Months Ended
Dec. 31, 2023
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 106.2
Change in fair value 83.5
Issuance of Series A Preferred Stock on July 7, 2023 (189.7)
Ending balance $ 0.0