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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2022 | Sep. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Derivative [Line Items] |  |  |  |
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months |  | $ 1.2 |  |
Interest rate swap cash flow hedge gain estimated to be reclassified into earnings during next 12 months |  | $ 23.4 |  |
Remaining maturity of forward foreign exchange contracts, maximum |  | 19 months |  |
Interest Rate Swaption | Not Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative amount received on termination of certain contracts | $ 56.4 |  |  |
Reduction in the asset value of the derivative due to termination | 188.7 |  |  |
Reduction in the liability value of the derivative due to termination | 131.3 |  |  |
Cash flow on termination of derivatives classified as operating activities | 188.7 |  |  |
Payment towards derivative instruments classified as financing activities | 134.5 |  |  |
Other payments derivative instruments | $ 3.2 |  |  |
Interest Rate Swaption | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rate derivative liability |  |  |  | $ 6.8
Forward exchange contracts | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months |  |  | $ 1.5 |
Interest rate swaps | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rate swap cash flow hedge gain estimated to be reclassified into earnings during next 12 months |  |  | $ 30.4 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
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