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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Property, Plant and Equipment
The following table shows estimated useful lives of property, plant and equipment:
Property, plant and equipmentUseful Life
Buildings40 to 50 years
Leasehold improvementsLesser of lease term or the life of the asset
Machinery, equipment and furniture3 to 10 years
Computer software5 to 10 years
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.