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Employee Benefit Plans - Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefit - Pension Benefits (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Pension Plan [Member] |  |
Accumulated other comprehensive loss, tax | $ 91.5 | $ 91.5

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- Definition Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax + References No definition available. + Details
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Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |