SUBSEQUENT EVENTS: (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Jan. 23, 2025 $ / shares	Feb. 28, 2025 USD ($)	Dec. 31, 2024 USD ($) $ / shares	Feb. 05, 2025 USD ($)	Feb. 04, 2025 ha	Sep. 30, 2024 $ / shares	Dec. 31, 2023 USD ($)	Apr. 30, 2015 USD ($)
SUBSEQUENT EVENTS
Common stock, stock dividends, per share, declared			$ 0.0222
Principal amount | $			$ 6,351.2				$ 6,351.2	$ 6,200.0
Issuance discount | $			$ 59.0				$ 61.2
Peru | Labor matters
SUBSEQUENT EVENTS
Extended term of agreement			6 years
Total signing payments | $			$ 62.0
O 2024 Q3 Dividends
SUBSEQUENT EVENTS
Common stock, stock dividends, per share, declared						$ 0.0056
O 2024 Q3 Dividends | Arithmetic Average Member
SUBSEQUENT EVENTS
Share price						$ 106.54
O 2024 Q4 Dividends
SUBSEQUENT EVENTS
Common stock, stock dividends, per share, declared			$ 0.0062
O 2024 Q4 Dividends | Arithmetic Average Member
SUBSEQUENT EVENTS
Share price			$ 112.43
Subsequent events | Peru | Labor matters
SUBSEQUENT EVENTS
Extended term of agreement		3 years
Total signing payments | $		$ 6.3
Subsequent events | Arithmetic Average Member
SUBSEQUENT EVENTS
Share price	$ 95.86
Subsequent events | O 2025 Q1 Dividends
SUBSEQUENT EVENTS
Common stock, stock dividends, per share, declared	0.0073
Quarterly dividend authorized (in dollars per share)	$ 0.7
Subsequent events | Los Chancas Project | Peru
SUBSEQUENT EVENTS
Area of land | ha					3,125
Subsequent events | Minera Mexico S.A. De C.V. | Fixed Rate Senior Unsecured Notes Due 2032
SUBSEQUENT EVENTS
Principal amount | $				$ 1,000.0
Issuance discount | $				$ 6.2
Interest rate (as a percent)				5.625%