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PENSIONS - Schedule of net liabilities and net assets recognized (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
PENSIONS        
Net defined benefit obligations $ 13.1 $ 18.3 $ 23.9 $ 31.8
Thereof: Net liabilities of underfunded plans        
PENSIONS        
Thereof: Net liabilities of underfunded plans 33.9 30.0    
Thereof: Net assets of overfunded plans        
PENSIONS        
Thereof: Net assets of overfunded plans (20.8) (11.7)    
Present value of funded obligations        
PENSIONS        
Net defined benefit obligations 178.2 171.0    
Fair value of plan assets        
PENSIONS        
Net defined benefit obligations 165.1 153.2    
Effect of asset ceiling        
PENSIONS        
Net defined benefit obligations $ 0.0 $ 0.5