PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

NOTE 9. PROPERTY, PLANT AND EQUIPMENT


		December 31,
	Useful Lives	2020		2019
		($ in millions)
Land and improvements to land	10-20 Years(1)	$	282.7	$	277.5
Buildings and building equipment	10-30 Years	409.4		392.4
Machinery and equipment	3-20 Years	5,945.2		5,566.0
Leasehold improvements	3-11 Years	8.3		9.9
Construction in progress		245.2		346.1
Property, plant and equipment		6,890.8		6,591.9
Accumulated depreciation		(3,719.8)		(3,268.1)
Property, plant and equipment, net		$	3,171.0	$	3,323.8

(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, 2020 was 11 years. Depreciation expense was $445.4 million, $493.3 million and $497.8 million for 2020, 2019 and 2018, respectively. Interest capitalized was $6.4 million, $10.8 million and $6.0 million for 2020, 2019 and 2018, respectively.

The consolidated statements of cash flows for the years ended December 31, 2020, 2019 and 2018, included an increase of $31.0 million and decreases of $5.7 million and $25.5 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, 2020, 2019 and 2018.