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Property and Equipment | 9 Months Ended
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Sep. 30, 2019
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment as of September 30, 2019 and December 31, 2018 consisted of the following, at cost (in millions):
| September 30, 2019 |  | December 31, 2018
Drilling rigs and equipment | $ | 17,615.1 |  |  |  | $ | 14,542.5 |
Work-in-progress | 574.6 |  |  |  | 779.2 |
Other | 203.2 |  |  |  | 195.3 |
| $ | 18,392.9 |  |  | $ | 15,517.0 |
Impairment of Long-Lived Assets On a quarterly basis, we evaluate the carrying value of our property and equipment to identify events or changes in circumstances that indicate the carrying value may not be recoverable. During the third quarter of 2019, we decided to retire VALARIS 5006, which was reclassified to held-for-sale. We recognized a pre-tax, non-cash impairment charge of $88.2 million, which represents the difference between the carrying value of the rig and related assets and their estimated fair values, less selling costs.

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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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