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Business Combinations - Narrative (Details) - S2 Systems Corporation - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
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		$ 1.4	$ 7.1
Compensation arrangement with individual, recorded liability		$ 7.5
Compensation arrangement, weighted-average remaining recognition period		2 years
Repayments of notes payable				$ 0.2
Estimated useful life of acquired developed technology		2 years
Purchase accounting adjustment				$ 0.8

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