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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2019
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) | 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.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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