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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 28.1		$ 28.1
ESPP percentage			15.00%
Weighted Average Remaining Contractual Term, Grants Vested			1 year 1 month 6 days
Employee stock purchase plan expenses	$ 0.2	$ 0.2	$ 0.5	$ 0.5
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	22,399,150		22,399,150
Weighted Average Remaining Contractual Term, Grants Vested			6 years 1 month 6 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	$ 12.2		$ 12.2
Restricted Stock Agreements [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	3.0		3.0
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax noncash compensation	$ 12.9		$ 12.9

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