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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Other operating expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure:    
Other operating expense $ 108.5 $ 137.0
Brazil    
Disclosure:    
Other operating expense 17.5  
Discontinued operations - mining sites    
Disclosure:    
Other operating expense 35.6 28.7
Fairbanks Gold Mining, Inc.    
Disclosure:    
Other operating expense $ 25.1 $ 37.9