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Business Combinations - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Repayments of notes payable			$ 0.2
Purchase accounting adjustment			0.8
S2 Systems Corporation
Business Acquisition [Line Items]
Consideration transferred	$ 17.7
Cash payments to acquire businesses	13.7
Cash acquired	0.1
Value of shares issued	1.8
Consideration held back	$ 2.2
Consideration holdback period	18 months
Payments to settle acquiree's outstanding debt	$ 6.9
Compensation arrangements value	20.3
Compensation arrangement with individual, compensation expense	$ 5.7	$ 1.4	2.8
Compensation arrangement with individual, recorded liability		$ 11.8	$ 11.8
Compensation arrangement, weighted-average remaining recognition period			2 years 8 months 12 days
Estimated useful life of acquired developed technology	2 years

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