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Financial expenses - Additional inforamtion (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Financial expenses            
Interest related to the installment payment programs for SMT and disputed mining royalties $ 53.6          
Interest related to the ITAN   $ 12.1 $ 3.1 $ 10.4 $ 10.4 $ 10.4
Interest of other taxes related to disputed mining royalty 2.9          
Interest associated with disputed mining royalties $ 1.2          
Interest and interest on penalties associated to disputed mining royalties   218.7        
Interest on income tax related to disputed mining royalties   75.7        
Interest related to the SMT   51.0        
Interest paid on royalty installment payment program   6.1        
Deferral interest related to the new royalty installment payment programs   5.3        
Interest of amended tax return   $ 1.3        
Interest on royalties, interest paid on the royalty installment payment program and interest on royalty penalties     $ 141.7