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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 32.7		$ 32.7
ESPP percentage			15.00%
Weighted Average Remaining Contractual Term, Grants Vested			1 year 3 months 18 days
Employee stock purchase plan expenses	$ 0.1	$ 0.2	$ 0.3	$ 0.3
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	22,484,901		22,484,901
Weighted Average Remaining Contractual Term, Grants Vested			6 years 3 months 18 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	$ 13.7		$ 13.7
Restricted Stock Agreements [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	5.1		5.1
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 13.9		$ 13.9

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