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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT A summary of changes in property, plant and equipment follows (in millions):
| December 31, 2017 |  | Additions / (Depreciation) |  | Retirements |  | December 31, 2018
Land | $ | 1.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 1.2 |
Leasehold improvements | 3.2 |  |  | — |  |  | (0.7 | ) |  | 2.5 |
Machinery and equipment | 1.3 |  |  | 0.1 |  |  | (0.4 | ) |  | 1.0 |
Other | 1.1 |  |  | — |  |  | — |  |  | 1.1 |
Property, plant and equipment, gross | 6.8 |  |  | 0.1 |  |  | (1.1 | ) |  | 5.8 |
Accumulated depreciation | (1.9 | ) |  | (0.8 | ) |  | 1.1 |  |  | (1.6 | )
Property, plant and equipment, net | $ | 4.9 |  |  | $ | (0.7 | ) |  | $ | — |  |  | $ | 4.2 |
Depreciation expense was $0.8 million and $1.4 million for the years ended December 31, 2018 and 2017, respectively. The Company sold assets and property in 2018 and 2017 related to its operations and the American Centrifuge project that were no longer needed (in millions):
| Year Ended December 31,
| 2018 |  | 2017
Sales of assets and property, net of auction fees and other costs | $ | 0.4 |  |  | $ | 4.8 |
Less: net carrying value | — |  |  | (0.2 | )
Gain on sales of assets | $ | 0.4 |  |  | $ | 4.6 |
Cash proceeds received | $ | 0.5 |  |  | $ | 4.7 |
Cash proceeds for the years ended December 31, 2018 and 2017 include $0.1 million and $0.2 million, respectively, which were included in Accounts Receivable as of December 31 of the prior year.

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- References No definition available. + Details
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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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