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FINANCING: (Details) $ in Millions		12 Months Ended	89 Months Ended
	Apr. 20, 2015 USD ($) tranche	Dec. 31, 2019 USD ($) item grade	Nov. 30, 2012 USD ($) item	Sep. 26, 2019 USD ($)	Dec. 31, 2018 USD ($)
FINANCING
Face amount		$ 7,051.2	$ 4,200.0		$ 6,125.0
Debt discount		69.6			58.8
Issuance costs	$ (11.8)	(40.8)			(32.3)
Long-term debt, Carrying Value		6,940.8			5,960.1
Less, current portion		399.8
Long-term debt		$ 6,541.0			5,960.1
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			400.0
Debt discount		0.1			0.3
Issuance costs		(0.1)			(0.4)
Long-term debt, Carrying Value		$ 399.8			$ 399.3
Interest rate (as a percent)		5.375%			5.375%
3.500% Senior unsecured notes due 2022
FINANCING
Face amount		$ 300.0			$ 300.0
Debt discount		0.3			0.5
Issuance costs		(0.5)			(0.6)
Long-term debt, Carrying Value		$ 299.2			$ 298.9
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		1.6			1.8
Issuance costs		(1.5)			(1.8)
Long-term debt, Carrying Value		$ 496.9			$ 496.4
Interest rate (as a percent)	3.875%	3.875%			3.875%
9.250% Yankee Bonds due 2028
FINANCING
Face amount		$ 51.2			$ 125.0
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		12.4			12.9
Issuance costs		(8.3)			(8.4)
Long-term debt, Carrying Value		$ 979.3			$ 978.7
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
Debt discount		7.1			7.3
Issuance costs		(5.7)			(5.8)
Long-term debt, Carrying Value		$ 1,087.2			$ 1,086.9
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
Debt discount		19.0			19.4
Issuance costs		(6.3)			(6.5)
Long-term debt, Carrying Value		$ 1,174.7			$ 1,174.1
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		16.4			16.6
Issuance costs		(8.6)			(8.8)
Long-term debt, Carrying Value		$ 1,475.0			$ 1,474.6
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
Debt discount		12.7
Issuance costs		(9.8)
Long-term debt, Carrying Value		$ 977.5
Interest rate (as a percent)		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
Interest rate (as a percent)				4.50%

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