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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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