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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
The following table shows estimated useful lives of property, plant and equipment:
Property, plant and equipmentUseful Life
Buildings
40 to 50 years
Leasehold improvementsLesser of lease term or the life of the asset
Machinery, equipment and furniture
3 to 10 years
Computer software
5 to 10 years
The components of net property, plant and equipment were as follows:
December 31,
(in millions)20212020
Land and improvements$21.5 $23.2 
Buildings and improvements to leaseholds140.2 145.9 
Machinery and equipment486.6 480.4 
Construction in progress8.1 8.3 
656.4 657.8 
Less: accumulated depreciation(441.8)(416.4)
Property, plant and equipment, net(1)
$214.6 $241.4 

(1)Net property, plant and equipment as of December 31, 2021 and 2020 contained $63.4 million and $65.8 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $12.9 million, $11.4 million and $8.9 million for the years ended December 31, 2021, 2020 and 2019, respectively.