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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	May 10, 2023	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 32.2		$ 32.2
ESPP percentage			15.00%
Weighted Average Remaining Contractual Term, Grants Vested			1 year 2 months 12 days
Impact of Divided to stock option awards and ESPP purchases					$ 1.5
Employee stock purchase plan expenses	$ 0.2	$ 0.2	$ 0.3	$ 0.4
2021 Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance						17,525,000
Share available for issuance	20,048,521		20,048,521
Weighted Average Remaining Contractual Term, Grants Vested			7 years 2 months 12 days
First Advantage Corporations [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, issued			0
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 14.1		$ 14.1
Restricted Stock Agreements [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	10.3		10.3
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 7.8		$ 7.8

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