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Customer Funds - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments Debt And Equity Securities [Abstract]
Investment income from invested customer funds included in recurring revenue	$ 10.7	$ 19.6

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- Definition

Investment income from invested customer fund.

+ References

No definition available.

+ Details

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Namespace Prefix:	cday_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration