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Leases - Future Minimum Lease Payments Under Operating and Financing Leases (Parenthetical) (Detail) $ in Millions	Dec. 31, 2020 USD ($)
Leases [Abstract]
Minimum sublease rentals under noncancellable subleases	$ 6.5

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- Definition

Minimum sublease rentals under noncancallable subleases.

+ References

No definition available.

+ Details

Name:	cday_MinimumSubleaseRentalsUnderNoncancallableSubleases
Namespace Prefix:	cday_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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