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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The “Property, plant and equipment, net” line item in the consolidated statements of financial position, as of December 31, 2024 and 2023, consisted of the following:
(Dollars in millions)20242023
Land and improvements$16.1 $16.8 
Buildings and improvements189.3 177.2 
Machinery and equipment367.6 343.0 
Office equipment69.1 70.7 
Property plant and equipment, gross642.1 607.7 
Accumulated depreciation(390.8)(385.7)
Property, plant and equipment, net251.3 222.0 
Construction in process113.8 144.3 
Total property, plant and equipment, net$365.1 $366.3 
The depreciation expense and impairment charges related to property, plant and equipment in 2024, 2023 and 2022, were as follows:
(Dollars in millions)202420232022
Depreciation expense$37.0 $37.7 $29.5 
Impairment charges$7.9 $— $47.2 
For additional information related to the impairment charges, refer to “Note 14 – Supplemental Financial Information.”