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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Cash and cash equivalents        
Cash deposits $ 369.4 $ 118.7    
Term deposits 9.1 13.4    
Cash and cash equivalents $ 378.5 $ 132.1 $ 398.9 $ 69.7