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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Employee benefits expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
CONSOLIDATED FINANCIAL STATEMENT DETAILS    
Salaries, short-term incentives, and other benefits $ 680.8 $ 668.6
Share-based payments 27.0 21.3
Other 26.4 9.6
Total employee benefits expense $ 734.2 $ 699.5