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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment – net consist of the following (in millions):
| December 31,
| 2020 |  | 2019
Property | $ | 43.6 |  |  | $ | 40.9 |
Plant | 250.1 |  |  | 168.1 |
Equipment | 390.2 |  |  | 358.3 |
Leasehold improvements | 49.9 |  |  | 55.8 |
Construction in progress | 31.1 |  |  | 101.1 |
Property, plant and equipment – gross | 764.9 |  |  | 724.2 |
Less: Accumulated depreciation | (358.3) |  |  | (334.8) |
Property, plant and equipment – net | $ | 406.6 |  |  | $ | 389.4 |
Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $42.3 million, $39.6 million and $39.0 million, respectively. During 2020, the Company completed construction of a manufacturing facility in Watertown, South Dakota. Related assets were placed in service and transferred from construction in progress to plant and equipment.

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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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