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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	May 10, 2023	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 29.4		$ 29.4
ESPP percentage			15.00%
Weighted Average Remaining Contractual Term, Grants Vested			10 months 24 days
Impact of Divided to stock option awards and ESPP purchases					$ 1.5
Incremental compensation expense	4.2		$ 4.2
Employee stock purchase plan expenses	$ 0.2	$ 0.2	$ 0.5	$ 0.7
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	19,896,715		19,896,715
Weighted Average Remaining Contractual Term, Grants Vested			6 years 10 months 24 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	$ 12.8		$ 12.8
Restricted Stock Agreements [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	8.5		8.5
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 8.1		$ 8.1

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