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FINANCING: (Details) $ in Millions		12 Months Ended	89 Months Ended
	Apr. 20, 2015 USD ($) tranche	Dec. 31, 2020 USD ($) item grade	Nov. 30, 2012 USD ($) item	Dec. 31, 2019 USD ($)	Sep. 26, 2019 USD ($)
FINANCING
Face amount		$ 6,651.2	$ 4,200.0	$ 7,051.0
Debt discount		67.6		69.6
Issuance costs	$ (11.8)	(39.4)		(40.8)
Long-term debt, Carrying Value		6,544.2		6,940.8
Less, current portion				399.8
Long-term debt, net of current portion		$ 6,544.2		6,541.0
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
5.375% Senior unsecured notes due 2020
FINANCING
Face amount				400.0
Debt discount				0.1
Issuance costs				(0.1)
Long-term debt, Carrying Value				$ 399.8
Interest rate (as a percent)				5.375%
3.500% Senior unsecured notes due 2022
FINANCING
Face amount		$ 300.0		$ 300.0
Debt discount		0.2		0.3
Issuance costs		(0.3)		(0.5)
Long-term debt, Carrying Value		$ 299.5		$ 299.2
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		1.3		1.6
Issuance costs		(1.2)		(1.5)
Long-term debt, Carrying Value		$ 497.5		$ 496.9
Interest rate (as a percent)	3.875%	3.875%		3.875%
9.250% Yankee Bonds due 2028
FINANCING
Face amount		$ 51.2		$ 51.0
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		12.0		12.4
Issuance costs		(8.0)		(8.3)
Long-term debt, Carrying Value		$ 980.0		$ 979.3
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		6.9		7.1
Issuance costs		(5.6)		(5.7)
Long-term debt, Carrying Value		$ 1,087.5		$ 1,087.2
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
Debt discount		18.6		19.0
Issuance costs		(6.2)		(6.3)
Long-term debt, Carrying Value		$ 1,175.2		$ 1,174.7
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		16.1		16.4
Issuance costs		(8.5)		(8.6)
Long-term debt, Carrying Value		$ 1,475.4		$ 1,475.0
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		12.5		12.7
Issuance costs		(9.6)		(9.8)
Long-term debt, Carrying Value		$ 977.9		$ 977.5
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%

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