Insurance and Other Income (Reinsurance Contracts) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Insurance Commissions and other income [Abstract]
Net written premiums	$ 7.2	$ 9.0	$ 9.8
Earned premiums	8.2	9.1	$ 7.6
Cash reserves	$ 4.9	$ 5.7