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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
NOTE 6. PROPERTY, PLANT AND EQUIPMENT
The classes of property, plant and equipment as of December 31 are summarized as follows:
($ in millions)20202019
Land and improvements$6.1 $6.2 
Buildings and leasehold improvements65.5 57.3 
Machinery and equipment265.6 263.7 
Gross property, plant and equipment337.2 327.2 
Less: accumulated depreciation(240.4)(225.3)
Property, plant and equipment, net (a)
$96.8 $101.9 
(a) Includes property, plant and equipment, net in the United States of $74.0 million and $78.5 million as of December 31, 2020 and 2019, respectively.
No interest was capitalized related to capitalized expenditures in any period.
Depreciation and amortization expense related to property, plant and equipment and owned assets classified as contract costs was $49.3 million, $52.7 million and $55.8 million, respectively, for the years ended December 31, 2020, 2019 and 2018.