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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Other operating expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure:    
Other operating expense $ 186.5 $ 108.5
COVID-19 Pandemic    
Disclosure:    
Other operating expense 64.1  
Tasiast Strike    
Disclosure:    
Other operating expense 8.3  
Brazil    
Disclosure:    
Other operating expense   17.5
Discontinued operations - mining sites    
Disclosure:    
Other operating expense $ 46.0 35.6
Fairbanks Gold Mining, Inc.    
Disclosure:    
Other operating expense   $ 25.1