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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	6 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cannae and THLM [Member]
Management fees description				Amount equal to the greater of (a) $0.9, or (b) 0.5 percent of Adjusted EBITDA.		Amount equal to the greater of (a) $0.9, or (b) 0.5 percent of Adjusted EBITDA.
Management fee under condition one				$ 0.9		$ 0.9
Management fee percentage of EBITDA under condition two				0.50%		0.50%
Number of years for which present value of the management fee to be paid in case of agreement termination	7 years
Management agreeement termination fee	$ 11.3
Management fee				$ 12.0	$ 1.4	$ 1.9	$ 5.0	$ 1.9
Senior notes owned						30.8	30.3	23.1
Interest payments received						3.2	3.2	3.2
Cannae and THLM [Member] | Convertible Preferred Stock [Member] | Transaction Advisory Fee [Member]
Transaction advisory fees							3.0
CompuCom Systems, Inc. [Member]
Payment to service provider				1.3	2.3	3.1	5.0	2.8
The Stronach Group [Member] | Dayforce [Member]
Revenue from related parties				0.2			0.2
FNF [Member]
Senior notes owned						24.0
Interest payments received				1.3	2.4
FNF [Member] | Dayforce [Member]
Revenue from related parties		$ 0.3	$ 0.4			$ 0.4	$ 0.3	$ 0.5
Fleet Cor Technologies Or Wholly Owned Affiliates [Member] | Dayforce HCM Services, Reseller/Referral Arrangement [Member]
Revenue from related parties				$ 0.2	0.4
Fleet Cor Technologies Inc [Member]
Rebates on corporate charge card purchases					$ 0.2

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Management fees percentage of EBITDA under condition two.

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Management fees under condition one in the agreement.

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Number of years for which present value of the management fee to be paid in case of agreement termination

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Rebate On Corporate Charge Card Purchases From Related Parties

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Description of the nature of payments to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP), including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or general partner, or whether the fee is waived.

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Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

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Payments of cash to suppliers for goods and services during the current period.

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The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Fees paid to advisors who provide certain management support and administrative oversight services including the organization and sale of stock, investment funds, limited partnerships and mutual funds.

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