Financing Arrangement (Line of Credit Facility) (Details) $ in Millions	9 Months Ended
	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Credit Facility, Initiation Date	Aug. 29, 2019
Credit Facility, Expiration Date	Aug. 29, 2024
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Facility, Maximum Borrowing Capacity	$ 500
Option To Request Additional Commitments On Credit Facility	500
Debt issuance costs	$ 2
Line of Credit Facility Term	5 years