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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