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FINANCING: (Details)
$ in Millions
 12 Months Ended 118 Months Ended
Dec. 31, 2023
USD ($)
item
grade
Apr. 30, 2015
USD ($)
item
Dec. 31, 2022
USD ($)
Sep. 26, 2019
USD ($)
FINANCING        
Face amount $ 6,351.2 $ 6,200.0 $ 6,351.2  
Issuance discount (61.2)   (63.4)  
Issuance costs (35.4)   (36.6)  
Long-term debt, Carrying Value 6,254.6   6,251.2  
Long-term debt, net of current portion $ 6,254.6   6,251.2  
Number of times for which senior unsecured notes were issued | item   8    
Percentage of principal amount at which notes may be required to be repurchased in event of change of control in the entity 101.00%      
Minimum        
FINANCING        
Number of decreased gradations that could cause a change of control triggering event | grade 1      
3.875% Senior unsecured notes due 2025        
FINANCING        
Face amount $ 500.0   500.0  
Issuance discount (0.4)   (0.7)  
Issuance costs (0.4)   (0.7)  
Long-term debt, Carrying Value $ 499.2   $ 498.6  
Interest rate (as a percent) 3.875%   3.875%  
9.250% Yankee Bonds due 2028        
FINANCING        
Face amount $ 51.2   $ 51.2  
Long-term debt, Carrying Value $ 51.2   $ 51.2  
Interest rate (as a percent) 9.25%   9.25%  
9.250% Yankee Bonds due 2028 | Minera Mexico        
FINANCING        
Ratio of EBITDA to interest expense | item 2.5      
9.250% Yankee Bonds due 2028 | Minera Mexico | Minimum        
FINANCING        
Ratio of EBITDA to interest expense 1.0      
7.500% Senior unsecured notes due 2035        
FINANCING        
Face amount $ 1,000.0   $ 1,000.0  
Issuance discount (10.5)   (11.0)  
Issuance costs (7.0)   (7.3)  
Long-term debt, Carrying Value $ 982.5   $ 981.7  
Interest rate (as a percent) 7.50%   7.50%  
6.750% Senior unsecured notes due 2040        
FINANCING        
Face amount $ 1,100.0   $ 1,100.0  
Issuance discount (6.3)   (6.6)  
Issuance costs (5.1)   (5.2)  
Long-term debt, Carrying Value $ 1,088.6   $ 1,088.2  
Interest rate (as a percent) 6.75%   6.75%  
5.250% Senior unsecured notes due 2042        
FINANCING        
Face amount $ 1,200.0   $ 1,200.0  
Issuance discount (17.1)   (17.6)  
Issuance costs (5.7)   (5.9)  
Long-term debt, Carrying Value $ 1,177.2   $ 1,176.5  
Interest rate (as a percent) 5.25%   5.25%  
5.875% Senior unsecured notes due 2045        
FINANCING        
Face amount $ 1,500.0   $ 1,500.0  
Issuance discount (15.1)   (15.4)  
Issuance costs (8.0)   (8.2)  
Long-term debt, Carrying Value $ 1,476.9   $ 1,476.4  
Interest rate (as a percent) 5.875%   5.875%  
4.500% Minera Mexico Senior unsecured notes due 2050        
FINANCING        
Face amount $ 1,000.0   $ 1,000.0  
Issuance discount (11.8)   (12.1)  
Issuance costs (9.2)   (9.3)  
Long-term debt, Carrying Value $ 979.0   $ 978.6  
Interest rate (as a percent) 4.50%   4.50%  
4.500% Minera Mexico Senior unsecured notes due 2050 | Minera Mexico S.A. de C.V. Notes        
FINANCING        
Face amount       $ 1,000.0
Issuance discount       (12.7)
Issuance costs       $ (9.8)
Interest rate (as a percent)       4.50%