Leases (Narratives) (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021
Leases [Abstract]
Right Of Use Asset Obtained In Exchange For Operating Lease Liability	$ 426.2		$ 513.6
Right Of Use Asset Obtained In Exchange For Finance Lease Liability	85.2		$ 92.5
Cash paid for operating leases	15.2	$ 14.2
Cash paid for finance leases	$ 87.5	$ 122.7