PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

NOTE 8. PROPERTY, PLANT AND EQUIPMENT

		December 31,
	Useful Lives	2021		2020
		($ in millions)
Land and improvements to land	10-20 Years(1)	$	284.3	$	282.7
Buildings and building equipment	10-30 Years	412.6		409.4
Machinery and equipment	3-20 Years	6,079.8		5,945.2
Leasehold improvements	3-11 Years	8.6		8.3
Construction in progress		204.8		245.2
Property, plant and equipment		6,990.1		6,890.8
Accumulated depreciation		(4,076.5)		(3,719.8)
Property, plant and equipment, net		$	2,913.6	$	3,171.0

(1) Useful life is exclusively related to improvements to land as land is not depreciated.

The weighted-average useful life of machinery and equipment at December 31, 2021 was 11 years. Depreciation expense was $443.3 million, $445.4 million and $493.3 million for 2021, 2020 and 2019, respectively.  Interest capitalized was $3.2 million, $6.4 million and $10.8 million for 2021, 2020 and 2019, respectively.

The consolidated statements of cash flows for the years ended December 31, 2021, 2020 and 2019, included increases of $6.4 million and $31.0 million and a decrease of $5.7 million, respectively, to capital expenditures, with the corresponding change to accounts payable and accrued liabilities, related to purchases of property, plant and equipment included in accounts payable and accrued liabilities at December 31, 2021, 2020 and 2019.