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INCOME AND MINING TAXES - Tax Cuts and Jobs Act (the "Act") and Tax Reform (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2017
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes          
Statutory tax rate (as a percent)     21.00% 35.00% 34.00%
Tax Cuts and Jobs Act reduction of deferred tax liability       $ 4.2  
Tax Cuts and Jobs Act reduction of deferred tax asset       $ 23.7  
Taxable income offset by non-operating losses     $ 13.6    
Argentina          
Income Taxes          
Statutory tax rate (as a percent)     35.00% 35.00%  
Argentinian Tax Cuts reduction of deferred tax liability $ 3.9        
Argentinian Tax Cuts reduction of deferred tax assets       $ 12.4  
Forecast | Argentina          
Income Taxes          
Statutory tax rate (as a percent)   25.00%