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FINANCING: - Debt instruments (Details) $ in Millions		12 Months Ended	89 Months Ended
	Apr. 20, 2015 USD ($) tranche	Dec. 31, 2018 USD ($) item grade	Nov. 30, 2012 USD ($) item	Dec. 31, 2017 USD ($)
FINANCING
Face amount		$ 6,125.0	$ 4,200.0	$ 6,125.0
Issuance discount		(58.8)		(60.5)
Issuance costs	$ (11.8)	(32.3)		(33.6)
Carrying value		5,960.1		5,957.1
Total long term debt		$ 5,960.1		5,957.1
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
Issuance discount		(0.3)		(0.6)
Issuance costs		(0.4)		(0.6)
Carrying value		$ 399.3		$ 398.8
Interest rate (as a percent)		5.375%		5.375%
3.500% Senior unsecured notes due 2022
FINANCING
Face amount		$ 300.0		$ 300.0
Issuance discount		(0.5)		(0.5)
Issuance costs		(0.6)		(0.8)
Carrying value		$ 298.9		$ 298.7
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
Issuance discount		(1.8)		(2.1)
Issuance costs		(1.8)		(2.0)
Carrying value		$ 496.4		$ 495.9
Interest rate (as a percent)	3.875%	3.875%		3.875%
9.250% Yankee Bonds due 2028
FINANCING
Face amount		$ 125.0		$ 125.0
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		(12.9)		(13.2)
Issuance costs		(8.4)		(8.8)
Carrying value		$ 978.7		$ 978.0
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
Issuance discount		(7.3)		(7.4)
Issuance costs		(5.8)		(5.9)
Carrying value		$ 1,086.9		$ 1,086.7
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		(19.4)		(19.8)
Issuance costs		(6.5)		(6.6)
Carrying value		$ 1,174.1		$ 1,173.6
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
Issuance discount		(16.6)		(16.9)
Issuance costs		(8.8)		(8.9)
Carrying value		$ 1,474.6		$ 1,474.2
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

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