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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Investments and loan receivable        
Cash deposits $ 187.7 $ 523.7    
Term deposits 10.0 10.5    
Cash and cash equivalents $ 197.7 $ 534.2 $ 378.5 $ 132.1