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Additional Financial Information - Summary of Changes in the Components of Accumulated Other Comprehensive Income Loss (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Additional Financial Information [Line Items] |  |  |
Loss Included in Direct Operating Expense | $ 0.3 | $ 0.3 | $ 0.2
Loss included in Interest Expense |  | $ 10.4 | $ 48.8
Gain included in Interest Expense | $ 34.6 |  |

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