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Debt (Loss (Gain) on Extinguishment of Debt) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | $ 28.2 | $ 0.0 | $ (5.4)
Term Loan B |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | 0.2 |  |
Revolving Credit Facility, Term Loan A and Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | 26.4 |  |
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances | 62.1 |  |
Total | 88.5 |  |
Revolving Credit Facility, Term Loan A and Senior Notes | New Debt Issuance Costs and Call Premiums |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | 21.2 |  |
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances | 31.0 |  |
Total | 52.2 |  |
Revolving Credit Facility, Term Loan A and Senior Notes | Previously Incurred Debt Issuance Costs |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | 5.2 |  |
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances | 31.1 |  |
Total | 36.3 |  |
Revolving Credit Facility, Term Loan B and Other |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | 1.8 |  |
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt | $ 1.1 |  |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt |  |  | (1.1)
Term Loan | Term Loan B, Repurchases |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt |  |  | (5.7)
Term Loan | Term Loan B, Prepayments |  |  |
Debt Instrument [Line Items] |  |  |
Loss (gain) on extinguishment of debt |  |  | $ 1.4

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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