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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
9. Property, Plant and Equipment, Net

The components of net property, plant and equipment were as follows:
December 31,
(in millions)20202019
Land and improvements$23.2 $24.0 
Buildings and improvements to leaseholds145.9 145.0 
Machinery and equipment480.4 475.1 
Construction in progress8.3 7.6 
657.8 651.7 
Less: accumulated depreciation(416.4)(384.6)
Property, plant and equipment, net(1)
$241.4 $267.1 

(1)Net property, plant and equipment as of December 31, 2020 and 2019 contained $65.8 million and $68.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $11.4 million, $8.9 million and $8.2 million for the years ended December 31, 2020, 2019 and 2018, respectively.