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Acquisitions - Appraisal Proceedings (Details) - Appraisal Proceedings - Guidance Software Inc. - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018 | Aug. 31, 2017
Business Acquisition [Line Items] |  |  |
Shares outstanding at acquisition (in shares) |  |  | 1,519,569
Percent of shares outstanding |  |  | 5.00%
Loss contingency accrual | $ 2.3 | $ 2.3 | $ 10.8
Share price (in dollars per share) |  |  | $ 7.10
Payments for legal settlements | $ 8.5 |  |

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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