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Additional Financial Information (Supplemental Cash Flow Information Related to Leases) (Details) - USD ($) $ in Millions | 6 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Additional Financial Information [Abstract] |  |
Right-of-use assets obtained in exchange for new operating lease obligations | $ 10.4 | $ 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

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References 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 + Details
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