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Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions			1 Months Ended	3 Months Ended
	Jul. 31, 2025	Jul. 23, 2025	Aug. 05, 2025	Sep. 30, 2025
Forecast
Subsequent Event [Line Items]
Pre-tax loss				$ 604.0
Estimated tax rate				24.30%
Subsequent Event
Subsequent Event [Line Items]
Debt securities, reclassified			$ 3,600.0
Proceeds from sale of available-for-sale securities			$ 3,200.0
Subsequent Event | Spirit Notes due 2030
Subsequent Event [Line Items]
Redeemed notes, principal amount	$ 37.0
Public Offering | Subsequent Event
Subsequent Event [Line Items]
Aggregate offering amount		$ 326.9
Common Class A | Public Offering | Subsequent Event
Subsequent Event [Line Items]
Number of shares issued (in shares)		18,653
Price per share (in dollars per share)		$ 18.50
Common Class A | Over-Allotment Option | Subsequent Event
Subsequent Event [Line Items]
Number of shares issued (in shares)		2,433

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