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Other Liabilities - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Feb. 14, 2019
Disclosure of detailed information about financial instruments [line items]      
Other liabilities $ 63.0 $ 57.8  
Yatela liability 18.5 18.5  
Yatela      
Disclosure of detailed information about financial instruments [line items]      
Percentage of voting equity interests acquired     80.00%
Consideration transferred, acquisition-date fair value     $ 1.0
Cash transferred     37.0
Yatela liability     $ 18.5
Embedded derivative - Rosebel power purchase agreement      
Disclosure of detailed information about financial instruments [line items]      
Other liabilities $ 29.2 $ 23.3