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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
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 |
Assets and Property Sold [Table Text Block] | 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 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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