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INCOME TAXES: - Provision (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S. federal and state:      
Current $ 2.6    
Deferred (13.0) $ 686.2 $ (109.4)
Uncertain tax positions   16.2 20.3
Provision for income taxes (10.4) 702.4 (89.1)
Foreign (Peru and Mexico):      
Current 1,102.4 951.7 625.0
Deferred (38.5) (60.7) (34.8)
Provision for income taxes 1,063.9 891.0 590.2
Total income tax provision 1,053.5 1,593.4 501.1
Earnings by location:      
U.S. (2.3) (1.5) (1.9)
Peru 441.8 284.6 (85.7)
Mexico 2,149.9 2,019.6 1,343.6
Foreign 2,591.7 2,304.2 1,257.9
Income before income taxes $ 2,589.4 $ 2,302.7 $ 1,256.0