Leases (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Right Of Use Asset Obtained In Exchange For Operating Lease Liability	$ 105.4
Right Of Use Asset Obtained In Exchange For Finance Lease Liability	948.2
Operating Cash Flows For Financing Leases	513.6	$ 734.9
Cash paid for finance leases	29.3	25.9
Cash paid for operating leases	$ 92.5	$ 106.4