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Third-Party Reinsurance - Reinsurance Recoverables (Details) - Ark Insurance Holdings Limited/Outrigger - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Segment reporting information    
Reinsurance recoverable on unpaid losses $ 508.3 $ 434.4
Reinsurance recoverables on paid losses 117.6 57.5
Ceded unearned premiums 210.2 97.1
Reinsurance recoverables 836.1 589.0
Ark    
Segment reporting information    
Reinsurance recoverable on unpaid losses (29.5) (31.8)
Reinsurance recoverables on paid losses (5.2) (3.1)
Ceded unearned premiums $ 3.9 $ (4.3)