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FINANCING: (Details)
$ in Millions
 12 Months Ended 89 Months Ended
Dec. 31, 2022
USD ($)
item
grade
Nov. 30, 2012
USD ($)
item
Dec. 31, 2021
USD ($)
Sep. 26, 2019
USD ($)
FINANCING        
Face amount $ 6,351.2 $ 6,200.0 $ 6,651.2  
Issuance discount (63.4)   (65.6)  
Issuance costs (36.6)   (38.0)  
Long-term debt, Carrying Value 6,251.2   6,547.6  
Less, current portion     299.7  
Long-term debt, net of current portion $ 6,251.2   6,247.9  
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      
3.500% Senior unsecured notes due 2022        
FINANCING        
Face amount     300.0  
Issuance discount     (0.1)  
Issuance costs     (0.2)  
Long-term debt, Carrying Value     $ 299.7  
Interest rate (as a percent)     3.50%  
3.875% Senior unsecured notes due 2025        
FINANCING        
Face amount $ 500.0   $ 500.0  
Issuance discount (0.7)   (1.0)  
Issuance costs (0.7)   (1.0)  
Long-term debt, Carrying Value $ 498.6   $ 498.0  
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 | Minimum        
FINANCING        
Ratio of EBITDA to interest expense | item 2.5      
7.500% Senior unsecured notes due 2035        
FINANCING        
Face amount $ 1,000.0   $ 1,000.0  
Issuance discount (11.0)   (11.6)  
Issuance costs (7.3)   (7.6)  
Long-term debt, Carrying Value $ 981.7   $ 980.8  
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 (6.6)   (6.7)  
Issuance costs (5.2)   (5.4)  
Long-term debt, Carrying Value $ 1,088.2   $ 1,087.9  
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 (17.6)   (18.1)  
Issuance costs (5.9)   (6.0)  
Long-term debt, Carrying Value $ 1,176.5   $ 1,175.9  
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 (15.4)   (15.8)  
Issuance costs (8.2)   (8.3)  
Long-term debt, Carrying Value $ 1,476.4   $ 1,475.9  
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 (12.1)   (12.3)  
Issuance costs (9.3)   (9.5)  
Long-term debt, Carrying Value $ 978.6   $ 978.2  
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%