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Debt (Loss on Extinguishment of Debt) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Extinguishment of Debt [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 0.4 | $ 0.0 | $ 27.1 | $ 0.0
Revolving Credit Facility, Term Loan A and Senior Notes |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Loss 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 |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Loss 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 |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Loss 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 |
Term Loan B |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 0.0 |  | 0.2 |
Term Loan B and Other |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Loss on extinguishment of debt |  |  | $ 0.7 |

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