Leases (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Leases [Abstract]
Right Of Use Asset Obtained In Exchange For Operating Lease Liability	$ 58.4	$ 74.2
Right Of Use Asset Obtained In Exchange For Finance Lease Liability	223.2	347.4
Operating Cash Flows For Financing Leases	32.1	30.2	$ 29.3
Cash paid for finance leases	124.2	166.3	221.2
Cash paid for operating leases	$ 9.5	$ 3.7	$ 6.8