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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT
NOTE 9. PROPERTY, PLANT AND EQUIPMENT
December 31,
Useful Lives20232022
Property Plant and Equipment($ in millions)
Land and improvements to land
10-20 Years(1)
$283.1 $283.5 
Buildings and building equipment10-30 Years442.7 412.0 
Machinery and equipment3-20 Years6,410.5 6,181.1 
Leasehold improvements3-11 Years8.5 8.5 
Construction in progress201.2 202.1 
Property, plant and equipment7,346.0 7,087.2 
Accumulated depreciation(4,826.4)(4,413.1)
Property, plant and equipment, net$2,519.6 $2,674.1 
(1)    Useful life is exclusive to land improvements.
The weighted-average useful life of machinery and equipment at December 31, 2023, was 11 years. Depreciation expense was $421.8 million, $469.9 million and $443.3 million for 2023, 2022 and 2021, respectively. Interest capitalized was $2.8 million, $3.1 million and $3.2 million for 2023, 2022 and 2021, respectively.
The consolidated statements of cash flows for the years ended December 31, 2023, 2022 and 2021, included an increase (decrease) of $5.3 million, $(4.2) million and $6.4 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, 2023, 2022 and 2021.