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INCOME TAXES: - Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
U.S. federal and state:
Uncertain tax positions			$ (1.3)
Provision for income taxes			(1.3)
Foreign (Peru and Mexico):
Current	$ 2,425.5	$ 1,237.9	966.3
Deferred	(126.3)	(63.5)	(30.1)
Uncertain tax position			10.4
Provision for income taxes	2,299.2	1,174.4	946.6
Total income tax provision	2,299.2	1,174.4	945.3
Earnings by location:
U.S.	(32.4)	(15.3)	(1.9)
Peru	1,962.8	723.9	513.0
Mexico	3,766.4	2,037.2	1,915.4
Foreign	5,729.2	2,761.1	2,428.4
Income before income taxes	$ 5,696.8	$ 2,745.8	$ 2,426.5

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