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PROPERTY: (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property
Total property	$ 18,276.8	$ 17,635.3
Accumulated depreciation, amortization and depletion	(8,812.4)	(8,176.6)
Total property and mine development, net	9,464.4	9,458.7	$ 9,371.0
Depreciation and depletion expense	797.3	766.4	$ 759.9
Buildings and equipment
Property
Total property	15,993.8	15,561.9
Construction in progress
Property
Total property	1,668.0	1,481.6
Mine development
Property
Total property	273.2	272.8
Mineral assets
Property
Total property	83.2	83.2
Land, other than mineral
Property
Total property	$ 258.6	$ 235.8

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The aggregate expense recognized in the current period that allocates the cost of tangible assets or depleting assets to periods that benefit from use of the assets.

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