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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Investments and loan receivable        
Cash deposits $ 541.2 $ 529.7    
Term deposits 369.4 9.6    
Cash and cash equivalents $ 910.6 $ 539.3 $ 197.7 $ 534.2