Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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- Definition

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+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

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Derivatives - Narrative (Details) $ in Millions	Mar. 31, 2025 GBP (£)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 GBP (£)	Mar. 31, 2024 USD ($)
Designated as cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount \| £	£ 335,000,000		£ 728,000,000
Derivative, fair value		$ 4.7		$ 0.1
Non-designated hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	£ 5,000,000	5.0	£ 0	$ 0.0
Derivative, fair value		$ 0.0