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Derivatives - Narrative (Details) £ in Millions, $ in Millions | Sep. 30, 2025 GBP (£) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 EUR (€) | Mar. 31, 2025 GBP (£) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 EUR (€)
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount | £ |  |  |  | £ 335.0 |  |
Derivative, fair value |  |  |  |  | $ 4.7 |
Designated as Hedging Instrument |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount | £ | £ 315.0 |  |  |  |  |
Derivative, fair value |  | $ 7.2 |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | $ 0.0 | € 0 |  | 5.0 | € 5,000,000.0
Derivative, fair value |  |  |  |  | $ 0.0 |

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