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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment 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)
2019
 
2018
Land and improvements
$
24.0

 
$
25.2

Buildings and improvements to leaseholds
145.0

 
144.2

Machinery and equipment
475.1

 
440.7

Construction in progress
7.6

 
8.6

 
651.7

 
618.7

Less: accumulated depreciation
(384.6
)
 
(355.0
)
Property, plant and equipment, net(1)
$
267.1

 
$
263.7



(1)
Net property, plant and equipment as of December 31, 2019 and 2018 contained $68.5 million and $51.9 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $8.9 million, $8.2 million and $7.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.