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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents.        
Bank balances and cash in hand $ 372.7 $ 499.3    
Demand deposits 649.4 1,044.0    
Total cash and cash equivalents $ 1,022.1 $ 1,543.3 $ 570.4 $ 182.8