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Derivatives - Schedule of Derivative Instruments (Details) £ in Millions, $ in Millions	Jun. 30, 2026 GBP (£)	Jun. 30, 2026 USD ($)	Mar. 31, 2026 GBP (£)	Mar. 31, 2026 USD ($)
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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- 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.

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Nominal or face amount used to calculate payment on derivative.

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