( April 16, 2026, 10:19 AM EDT) -- DETROIT — A captive insurer filed a supplemental brief in Michigan federal court arguing that its dispute with a reinsurer and a claims handler over coverage for Legionnaires’ disease claims under a reinsurance agreement to which the claims handler is not a party presents a justiciable controversy that is not subject to a pending arbitration with its reinsurer after a judge ordered briefing on whether its declaratory claim against a nonparty is subject to arbitration or may proceed in court....