Income Taxes - Schedule of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred income tax assets (liabilities):
Mark-to-market investments - OCI	$ 0.2	$ 0.3
Stock-based compensation	18.0	15.1
Investment in Paycom Payroll Holdings, LLC	(167.9)	(159.3)
Net operating losses		0.1
Noncurrent deferred income tax liabilities, net	$ (149.7)	$ (143.8)

Deferred tax liabilities, investments

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- Definition

Deferred tax assets mark to market investments in other comprehensive income.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-6

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

+ References

+ Details

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- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

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