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Third-Party Reinsurance - Reinsurance Recoverables (Details) - P&C Insurance and Reinsurance (Ark/WM Outrigger) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Reinsurance recoverables on unpaid losses	$ 522.5	$ 434.4
Reinsurance recoverables on paid losses	60.6	57.5
Ceded unearned premiums	341.7	97.1
Reinsurance recoverables	924.8	589.0
Ark
Segment Reporting Information [Line Items]
Reinsurance recoverables on unpaid losses	(33.3)	(31.8)
Reinsurance recoverables on paid losses	(2.7)	(3.1)
Ceded unearned premiums	$ (25.4)	$ (4.3)

Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

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