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Related Party Transactions (Details) - Company's directors and executive team [member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]    
Short-term employee benefits $ 7.0 $ 6.7
Share-based payments 4.6 5.2
Amounts payable, related party transactions $ 11.6 $ 11.9