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Other operating expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other operating expenses      
Impairment loss (recovery)     $ (4.3)
Sundry $ 0.9 $ 1.0  
Total Other Operating Expenses $ 0.9 $ 1.0 $ (4.3)