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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGE ACCOUNTING - Summary of Cash Flow Hedge Movement with Impact on Other Comprehensive Income Results (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Changes in the fair value of options      
(Loss) gain on hedge reserve $ (1.1) $ 0.0 $ 7.4
(Loss) gain cost of hedging reserve 6.4 (17.6) 1.6
Net balance in other comprehensive income 5.3 (17.6) 9.0
Deferred tax (1.8) 6.0 0.0
Reclassification to profit or loss      
Fair value 17.6 (8.9) (2.5)
Deferred tax (6.0) 0.0
Other reclassifications 0.0 (4.2) 0.8
Total movements in other comprehensive income $ 15.1 $ (24.7) $ 7.3