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FINANCING: (Details)
$ in Millions
 12 Months Ended 89 Months Ended
Apr. 20, 2015
USD ($)
tranche
Dec. 31, 2021
USD ($)
item
grade
Nov. 30, 2012
USD ($)
item
Dec. 31, 2020
USD ($)
Sep. 26, 2019
USD ($)
FINANCING          
Face amount   $ 6,651.2 $ 4,200.0 $ 6,651.2  
Debt discount   65.6   67.6  
Issuance costs $ (11.8) (38.0)   (39.4)  
Long-term debt, Carrying Value   6,547.6   6,544.2  
Less, current portion   299.7      
Long-term debt, net of current portion   $ 6,247.9   6,544.2  
Number of tranches | tranche 2        
Underwriters discount $ 20.2        
Number of times for which senior unsecured notes were issued | item     6    
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   300.0  
Debt discount   0.1   0.2  
Issuance costs   (0.2)   (0.3)  
Long-term debt, Carrying Value   $ 299.7   $ 299.5  
Interest rate (as a percent)   3.50%   3.50%  
3.875% Senior unsecured notes due 2025          
FINANCING          
Face amount $ 500.0 $ 500.0   $ 500.0  
Debt discount   1.0   1.3  
Issuance costs   (1.0)   (1.2)  
Long-term debt, Carrying Value   $ 498.0   $ 497.5  
Interest rate (as a percent) 3.875% 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  
Debt discount   11.6   12.0  
Issuance costs   (7.6)   (8.0)  
Long-term debt, Carrying Value   $ 980.8   $ 980.0  
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  
Debt discount   6.7   6.9  
Issuance costs   (5.4)   (5.6)  
Long-term debt, Carrying Value   $ 1,087.9   $ 1,087.5  
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  
Debt discount   18.1   18.6  
Issuance costs   (6.0)   (6.2)  
Long-term debt, Carrying Value   $ 1,175.9   $ 1,175.2  
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   $ 1,500.0  
Debt discount   15.8   16.1  
Issuance costs   (8.3)   (8.5)  
Long-term debt, Carrying Value   $ 1,475.9   $ 1,475.4  
Interest rate (as a percent) 5.875% 5.875%   5.875%  
Fixed-rate senior unsecured notes issued in April 2015          
FINANCING          
Face amount $ 2,000.0        
4.500% Minera Mexico Senior unsecured notes due 2050          
FINANCING          
Face amount   $ 1,000.0   $ 1,000.0  
Debt discount   12.3   12.5  
Issuance costs   (9.5)   (9.6)  
Long-term debt, Carrying Value   $ 978.2   $ 977.9  
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
Debt discount         12.7
Issuance costs         $ (9.8)
Interest rate (as a percent)         4.50%