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Financing and Other Debt - Schedule of Short Term Debt (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2026	Jun. 30, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Total short term debt, net	$ 1,631,400,000		$ 1,326,400,000
Current portion of long-term debt	54,700,000		54,700,000
Participation debt
Debt Instrument [Line Items]
Total short term debt, net	$ 8,800,000		$ 65,200,000
Interest Rate	5.91%		5.94%
FHLB advances
Debt Instrument [Line Items]
Total short term debt, net	$ 1,275,000,000		$ 1,105,000,000
Interest Rate	3.85%		3.87%
Borrowed federal funds
Debt Instrument [Line Items]
Total short term debt, net	$ 185,000,000.0		$ 0
Interest Rate	3.75%	0.00%
Securitized debt (VIEs)
Debt Instrument [Line Items]
Total short term debt, net	$ 107,900,000		$ 101,400,000
Interest Rate	4.94%		4.68%

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