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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investments and loan receivable      
Cash deposits $ 529.7 $ 523.7  
Term deposits 9.6 10.5  
Cash and cash equivalents $ 539.3 $ 534.2 $ 132.1