PROPERTY, PLANT AND EQUIPMENT (Notes)

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

The following table indicates the carrying value of each of the major classes of our depreciable assets:

	(In Millions)
	September 30, 2020		December 31, 2019
Land, land improvements and mineral rights	$	653.2	$	582.2
Buildings	454.4		157.8
Steel and Manufacturing equipment	2,128.0		42.0
Mining and Pelletizing equipment	1,455.2		1,413.6
Other	121.3		101.5
Construction-in-progress	1,145.9		730.3
Total property, plant and equipment1	5,958.0		3,027.4
Allowance for depreciation and depletion	(1,407.3)		(1,098.4)
Property, plant and equipment, net	$	4,550.7	$	1,929.0
1 Includes right-of-use assets related to finance leases of $97.1 million and $49.0 million as of September 30, 2020 and December 31, 2019, respectively.

    We recorded capitalized interest into property, plant and equipment of $14.7 million and $38.0 million during the three and nine months ended September 30, 2020, respectively, and $7.0 million and $16.9 million for the three and nine months ended September 30, 2019, respectively.

    We recorded depreciation and depletion expense of $71.8 million and $182.5 million for the three and nine months ended September 30, 2020, respectively, and $22.0 million and $62.5 million for the three and nine months ended September 30, 2019, respectively.