Additional Financial Information (Supplemental Cash Flow Information Related to Leases) (Details) - USD ($) $ in Millions	9 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Additional Financial Information [Abstract]
Right-of-use assets obtained in exchange for new operating lease obligations	$ 14.2	$ 2.1
Increase in operating lease right-of-use assets due to a reassessment event	6.0	0.0
Increase in operating lease liability due to a reassessment event	$ 12.6	$ 0.0

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

Name:	us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration