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Financing Arrangement (Line of Credit Facility) (Details) - Revolving Credit Facility [Member]
$ in Millions
6 Months Ended
Sep. 30, 2018
USD ($)
Line of Credit Facility [Line Items]  
Credit Facility, Maximum Borrowing Capacity $ 500
Option To Request Additional Commitments On Credit Facility 250
Debt issuance costs $ 2
Credit Facility, Initiation Date Mar. 19, 2015
Credit Facility, Expiration Date Mar. 19, 2020
Line of Credit Facility Term 5 years