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Derivatives - Schedule of Derivative Instruments (Details) £ in Millions, $ in Millions | Jun. 30, 2026 GBP (£) | Jun. 30, 2026 USD ($) | Mar. 31, 2026 GBP (£) | Mar. 31, 2026 USD ($)
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount |  |  | £ 405.0 |
Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount | £ 470.0 |  |  |
Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, notional amount | $ |  | $ 631 |  | $ 544

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