XML 93 R62.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Customer Trust Fund - Amortized Cost and Fair Value of Investment Security Available for Sale (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |  |
Due in one year or less, Cost | $ 2,024.4 | $ 2,761.6 |
Due in one to three years, Cost | 565.6 | 518.3 |
Due in three to five years, Cost | 565.5 | 528.8 |
Due after five years, Cost | 292.9 | 288.5 |
Invested customer trust funds, Cost | 3,448.4 | 4,097.2 | $ 3,686.8
Due in one year or less, Fair Value | 2,023.9 | 2,762.0 |
Due in one to three years, Fair Value | 556.5 | 648.8 |
Due in three to five years, Fair Value | 557.6 | 473.9 |
Due after five years, Fair Value | 280.0 | 206.7 |
Invested customer trust funds, Fair Value | $ 3,418.0 | $ 4,091.4 | $ 3,697.3

X
- Definition Available For Sale Securities Debt Maturities After Five Years Amortized Cost + References No definition available. + Details
Name: | cday_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available For Sale Securities Debt Maturities After Five Years Fair Value + References No definition available. + Details
Name: | cday_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsFairValue
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available For Sale Securities Debt Maturities After One Through Three Years Amortized Cost + References No definition available. + Details
Name: | cday_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsAmortizedCost
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available For Sale Securities Debt Maturities After One Through Three Years Fair Value + References No definition available. + Details
Name: | cday_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available For Sale Securities Debt Maturities After Three Through Five Years Amortized Cost + References No definition available. + Details
Name: | cday_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeThroughFiveYearsAmortizedCost
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available For Sale Securities Debt Maturities After Three Through Five Years Fair Value + References No definition available. + Details
Name: | cday_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeThroughFiveYearsFairValue
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Invested customer trust funds. + References No definition available. + Details
Name: | cday_InvestedCustomerTrustFunds
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Invested customer trust funds amortized cost. + References No definition available. + Details
Name: | cday_InvestedCustomerTrustFundsAmortizedCost
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration