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PROPERTY, PLANT & EQUIPMENT | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT & EQUIPMENT | PROPERTY, PLANT & EQUIPMENT The major classes of depreciable assets are as follows:
|  | December 31, |  |
In millions |  | 2019 |  | 2018
Machinery and equipment |  | $ | 1,363.8 |  |  | $ | 749.8 |
Buildings and improvements |  | 774.2 |  |  | 248.1 |
Land and improvements |  | 78.0 |  |  | 38.7 |
Property, plant and equipment |  | 2,216.0 |  |  | 1,036.6 |
Less: accumulated depreciation |  | (560.2) |  |  | (472.8) |
Total |  | $ | 1,655.8 |  |  | $ | 563.8 |
The estimated useful lives of property, plant and equipment are as follows:
| Years
Land improvements | 10 to 20
Building and improvements | 20 to 40
Machinery and equipment | 3 to 15
Depreciation expense was $157.8 million, $66.4 million, and $66.7 million for 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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