PROPERTY: (Tables)

12 Months Ended

Dec. 31, 2023

PROPERTY:

Schedule of major classes of property, plant and equipment

	At December 31,
(in millions)	2023		2022
Buildings and equipment	$	17,439.3	$	16,718.3
Construction in progress		1,664.8		1,747.0
Mine development		320.7		273.2
Mineral assets		83.2		83.2
Land, other than mineral		277.5		275.4
Total property		19,785.5		19,097.1
Accumulated depreciation, amortization and depletion		(10,002.6)		(9,500.5)
Total property and mine development, net	$	9,782.9	$	9,596.6