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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 | Sep. 14, 2017 | 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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