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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2022
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 equipment

 

Useful Life

Buildings

 

40 to 50 years

Leasehold improvements

 

Lesser 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)

 

2022

 

2021

Land and improvements

$

20.6

$

21.5

Buildings and improvements to leaseholds

 

125.3

 

140.2

Machinery and equipment

 

439.5

 

486.6

Construction in progress

 

3.8

 

8.1

 

 

589.2

 

656.4

Less: accumulated depreciation

 

(404.1)

 

(441.8)

Net property, plant and equipment (1)

$

185.1

$

214.6

 

(1)
Net property, plant and equipment as of December 31, 2022 and 2021 contained $52.5 million and $63.4 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $13.9 million, $12.9 million and $11.4 million for the years ended December 31, 2022, 2021 and 2020, respectively.