Leases (Narratives) (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
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
Cash paid for operating leases	13.0
Cash paid for finance leases	$ 180.9