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Debt (Gain (Loss) on Extinguishment of Debt) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt | $ 5.4 | $ (1.9) | $ (35.7)
Term Loan B prepayments |  |  |
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt | 5.4 | (1.9) |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt | 1.1 | 0.0 |
Term Loan | Term Loan B repurchases |  |  |
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt | 5.7 | 0.0 |
Term Loan | Term Loan B prepayments |  |  |
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt | $ (1.4) | $ (1.9) |
New debt issuance costs |  |  |
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt |  |  | (11.0)
Capitalized & Amortized Over Life of New Issuances |  |  | 11.6
Total |  |  | 22.6
Previously incurred debt issuance costs or unamortized discount |  |  |
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (24.7)

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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