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Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Other liabilities $ 63.0 $ 57.8
Yatela liability 18.5 18.5
Other liabilities 11.6 4.0
Current portion of other liabilities 22.7 27.9
Non-current portion of other liabilities 40.3 29.9
Embedded derivative - Rosebel power purchase agreement    
Disclosure of detailed information about financial instruments [line items]    
Other liabilities 29.2 23.3
Hedge derivatives    
Disclosure of detailed information about financial instruments [line items]    
Other liabilities 0.7 12.0
Non-hedge derivative    
Disclosure of detailed information about financial instruments [line items]    
Other liabilities $ 3.0 $ 0.0