XML 92 R57.htm IDEA: XBRL DOCUMENT v3.20.4
Cash and cash equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents      
Cash deposits $ 523.7 $ 118.7  
Term deposits 10.5 13.4  
Cash and cash equivalents $ 534.2 $ 132.1 $ 69.7