Dayforce (DAY) 10-Q 4 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 28, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Trading Symbol	CDAY
Title of 12(b) Security	Common stock, $0.01 par value
Security Exchange Name	NYSE
Entity Registrant Name	Ceridian HCM Holding Inc.
Entity Central Index Key	0001725057
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-38467
Entity Incorporation State Country Code	DE
Entity Tax Identification Number	46-3231686
Entity Address Address Line1	3311 East Old Shakopee Road
Entity Address City Or Town	Minneapolis
Entity Address State Or Province	MN
Entity Address Postal Zip Code	55425
City Area Code	952
Local Phone Number	853-8100
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		149,861,732

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and equivalents	$ 335.2	$ 188.2
Restricted cash	2
Trade and other receivables, net	118.2	101.1
Prepaid expenses and other current assets	84.9	73.9
Total current assets before customer funds	540.3	363.2
Customer funds	3,215.4	3,759.4
Total current assets	3,755.7	4,122.6
Right of use lease asset	33.6	27.9
Property, plant, and equipment, net	146.2	136.4
Goodwill	2,329.5	2,031.8
Other intangible assets, net	341.2	195
Other assets	200.8	187.6
Total assets	6,807	6,701.3
Current liabilities:
Current portion of long-term debt	8.3	7.2
Current portion of long-term lease liabilities	10	10.5
Accounts payable	39	38.9
Deferred revenue	43.2	24.4
Employee compensation and benefits	59.1	64.6
Other accrued expenses	42.5	20.5
Total current liabilities before customer funds obligations	202.1	166.1
Customer funds obligations	3,171.9	3,697.8
Total current liabilities	3,374	3,863.9
Long-term debt, less current portion	1,118.5	660.6
Employee benefit plans	22.6	24.4
Long-term lease liabilities, less current portion	41.4	33.6
Other liabilities	50.7	20.6
Total liabilities	4,607.2	4,603.1
Commitments and contingencies (Note 14)
Stockholders’ equity:
Common stock, $0.01 par, 500,000,000 shares authorized, 149,752,249 and 148,571,412 shares issued and outstanding, respectively	1.5	1.5
Additional paid in capital	2,739.8	2,606.5
Accumulated deficit	(278.8)	(233.8)
Accumulated other comprehensive loss	(262.7)	(276)
Total stockholders’ equity	2,199.8	2,098.2
Total liabilities and equity	$ 6,807	$ 6,701.3

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	500,000,000	500,000,000
Common Stock, shares issued	149,752,249	148,571,412
Common Stock, shares outstanding	149,752,249	148,571,412

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Total revenue	$ 250.4	$ 192.6	$ 484.9	$ 415.3
Cost of revenue:
Recurring	65.4	49.3	125.1	101.5
Professional services and other	47.3	37.9	92	80.5
Product development and management	31.8	17	57.6	34.6
Depreciation and amortization	13.8	9.8	24.9	19.6
Total cost of revenue	158.3	114	299.6	236.2
Gross profit	92.1	78.6	185.3	179.1
Selling, general, and administrative	111.8	74.6	207.4	148.8
Operating (loss) profit	(19.7)	4	(22.1)	30.3
Interest expense, net	9.9	6.6	15.5	13.5
Other expense, net	8.2	0.3	12.8	2.9
(Loss) income before income taxes	(37.8)	(2.9)	(50.4)	13.9
Income tax benefit	(12)	(8.4)	(5.4)	(0.2)
Net (loss) income	$ (25.8)	$ 5.5	$ (45)	$ 14.1
Net (loss) income per share:
Basic	$ (0.17)	$ 0.04	$ (0.30)	$ 0.10
Diluted	$ (0.17)	$ 0.04	$ (0.30)	$ 0.09
Weighted-average shares outstanding:
Basic	149,293,833	145,593,019	149,006,538	145,119,172
Diluted	149,293,833	151,444,901	149,006,538	151,321,093
Recurring [Member]
Revenue:
Total revenue	$ 208.1	$ 159.1	$ 404.1	$ 340.6
Professional Services and Other [Member]
Revenue:
Total revenue	$ 42.3	$ 33.5	$ 80.8	$ 74.7

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income		$ (25.8)	$ 5.5	$ (45)	$ 14.1
Items of other comprehensive income before income taxes:
Change in foreign currency translation adjustment		13	21.6	24	(27.5)
Change in unrealized (loss) gain from invested customer funds		(5.4)	20.1	(22.1)	43.5
Change in pension liability adjustment	[1]	3.8	3.3	7.6	6.6
Other comprehensive income before income taxes		11.4	45	9.5	22.6
Income tax (benefit) expense, net		(0.4)	5.9	(3.8)	12.7
Other comprehensive income after income taxes		11.8	39.1	13.3	9.9
Comprehensive (loss) income		$ (14)	$ 44.6	$ (31.7)	$ 24
[1]	The amount of the pension liability adjustment recognized in the condensed consolidated statements of operations within other expense, net was $3.7 million and $3.3 million during the three months ended June 30, 2021, and 2020, respectively, and $7.5 million and $6.6 million during the six months ended June 30, 2021, and 2020, respectively.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Expense, Net [Member]
Pension liability adjustment	$ 3.7	$ 3.3	$ 7.5	$ 6.6

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2019	$ 1,882.3	$ 1.4	$ 2,449.1	$ (229.8)	$ (338.4)
Balance, shares at Dec. 31, 2019		144,386,618
Net income (loss)	8.6			8.6
Issuance of common stock under share-based compensation plans	11.4		11.4
Issuance of common stock under share-based compensation plans, shares		551,328
Share-based compensation	12.5		12.5
Foreign currency translation	(49.1)				(49.1)
Change in unrealized gain, net of tax	17.4				17.4
Change in pension liability adjustment, net of tax	2.5				2.5
Ending balance at Mar. 31, 2020	1,885.6	$ 1.4	2,473	(221.2)	(367.6)
Balance, shares at Mar. 31, 2020		144,937,946
Beginning balance at Dec. 31, 2019	1,882.3	$ 1.4	2,449.1	(229.8)	(338.4)
Balance, shares at Dec. 31, 2019		144,386,618
Net income (loss)	14.1
Ending balance at Jun. 30, 2020	1,985.7	$ 1.5	2,528.4	(215.7)	(328.5)
Balance, shares at Jun. 30, 2020		146,803,932
Beginning balance at Mar. 31, 2020	1,885.6	$ 1.4	2,473	(221.2)	(367.6)
Balance, shares at Mar. 31, 2020		144,937,946
Net income (loss)	5.5			5.5
Issuance of common stock under share-based compensation plans	40.2	$ 0.1	40.1
Issuance of common stock under share-based compensation plans, shares		1,865,986
Share-based compensation	15.3		15.3
Foreign currency translation	21.6				21.6
Change in unrealized gain, net of tax	15				15
Change in pension liability adjustment, net of tax	2.5				2.5
Ending balance at Jun. 30, 2020	1,985.7	$ 1.5	2,528.4	(215.7)	(328.5)
Balance, shares at Jun. 30, 2020		146,803,932
Beginning balance at Dec. 31, 2020	2,098.2	$ 1.5	2,606.5	(233.8)	(276)
Balance, shares at Dec. 31, 2020		148,571,412
Net income (loss)	(19.2)			(19.2)
Issuance of common stock under share-based compensation plans	11.3		11.3
Issuance of common stock under share-based compensation plans, shares		341,975
Share-based compensation	22.8		22.8
Equity component of convertible senior notes	77.7		77.7
Purchase of capped calls related to convertible senior notes	(33)		(33)
Foreign currency translation	11				11
Change in unrealized gain, net of tax	(12.3)				(12.3)
Change in pension liability adjustment, net of tax	2.8				2.8
Ending balance at Mar. 31, 2021	2,159.3	$ 1.5	2,685.3	(253)	(274.5)
Balance, shares at Mar. 31, 2021		148,913,387
Beginning balance at Dec. 31, 2020	2,098.2	$ 1.5	2,606.5	(233.8)	(276)
Balance, shares at Dec. 31, 2020		148,571,412
Net income (loss)	(45)
Ending balance at Jun. 30, 2021	2,199.8	$ 1.5	2,739.8	(278.8)	(262.7)
Balance, shares at Jun. 30, 2021		149,752,249
Beginning balance at Mar. 31, 2021	2,159.3	$ 1.5	2,685.3	(253)	(274.5)
Balance, shares at Mar. 31, 2021		148,913,387
Net income (loss)	(25.8)			(25.8)
Issuance of common stock under share-based compensation plans	23.1		23.1
Issuance of common stock under share-based compensation plans, shares		838,862
Share-based compensation	31.4		31.4
Foreign currency translation	13				13
Change in unrealized gain, net of tax	(4)				(4)
Change in pension liability adjustment, net of tax	2.8				2.8
Ending balance at Jun. 30, 2021	$ 2,199.8	$ 1.5	$ 2,739.8	$ (278.8)	$ (262.7)
Balance, shares at Jun. 30, 2021		149,752,249

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement Of Stockholders Equity [Abstract]
Change in unrealized (loss) gain, tax	$ (1.4)	$ (4.4)	$ 5.1	$ 6
Change in pension liability adjustment, tax	$ 1	$ 1	$ 0.8	$ 0.8

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement Of Cash Flows [Abstract]
Net (loss) income	$ (45)	$ 14.1
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income tax benefit	(29.2)	0.3
Depreciation and amortization	38.3	23.9
Amortization of debt issuance costs and debt discount	6.2	0.6
Provision for doubtful accounts	0.9	0.5
Net periodic pension and postretirement cost	4.4	1.7
Non-cash share-based compensation	54.2	27.8
Other	(0.4)	0.4
Changes in operating assets and liabilities excluding effects of acquisitions and divestitures:
Trade and other receivables	(3.7)	(3.8)
Prepaid expenses and other current assets	(12.1)	(6.4)
Accounts payable and other accrued expenses	(1.5)	(1.8)
Deferred revenue	1.7	(1.1)
Employee compensation and benefits	(14.3)	(21.3)
Accrued interest	0.4	0.2
Accrued taxes	27.4	(3.7)
Other assets and liabilities	(4.2)	(7.5)
Net cash provided by operating activities	23.1	23.9
Cash Flows from Investing Activities
Purchase of customer funds marketable securities	(280.8)	(24.8)
Proceeds from sale and maturity of customer funds marketable securities	276.2	214
Expenditures for property, plant, and equipment	(5.9)	(9.9)
Expenditures for software and technology	(25.4)	(19.8)
Acquisition costs, net of cash and restricted cash acquired	(373.6)	(58.3)
Net cash (used in) provided by investing activities	(409.5)	101.2
Cash Flows from Financing Activities
Increase in customer funds obligations, net	(566.1)	(571.4)
Proceeds from issuance of common stock under share-based compensation plans	34.4	51.5
Repayment of long-term debt obligations	(2.7)	(5.4)
Proceeds from revolving credit facility	295	295
Repayment of revolving credit facility	(295)
Proceeds from issuance of convertible senior notes, net of issuance costs	561.8
Purchases of capped calls related to convertible senior notes	(45)
Net cash used in financing activities	(17.6)	(230.3)
Effect of exchange rate changes on cash, restricted cash, and equivalents	6.7	(12.4)
Net decrease in cash, restricted cash, and equivalents	(397.3)	(117.6)
Cash, restricted cash, and equivalents at beginning of period	2,228.5	1,658.6
Cash, restricted cash, and equivalents at end of period	1,831.2	1,541
Reconciliation of cash, restricted cash, and equivalents to the condensed consolidated balance sheets
Cash and equivalents	335.2	526.9
Restricted cash	2
Restricted cash and equivalents included in customer funds	$ 1,494	$ 1,014.1
Restricted Cash and Cash Equivalents, Current, Asset, Statement of Financial Position [Extensible List]	Customer funds	Customer funds
Cash, restricted cash, and equivalents at end of period	$ 1,831.2	$ 1,541

Organization

Organization	6 Months Ended
	Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	1. Organization Ceridian HCM Holding Inc. and its subsidiaries (also referred to in this report as “Ceridian,” “we,” “our,” “us,” or the “Company”) offer a broad range of services and software designed to help employers more effectively manage employment processes, such as payroll, payroll-related tax filing, human resource information systems, employee self-service, time and labor management, employee assistance programs, and recruitment and applicant screening. Our technology-based services are typically provided through long-term customer relationships that result in a high level of recurring revenue.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information. Accordingly, the unaudited condensed consolidated financial statements do not include all of the information and notes required by GAAP for complete financial statements. The accounting policies we follow are set forth in Note 2, “Summary of Significant Accounting Policies,” to our audited consolidated financial statements in our 2020 Form 10-K 2020 Form 10-K In the opinion of management, the unaudited condensed consolidated financial statements contained herein reflect all adjustments (consisting only of normal recurring adjustments, except as set forth in these notes to condensed consolidated financial statements) necessary to present fairly in all material aspects the financial position, results of operations, comprehensive income (loss), and cash flows from all periods presented. Interim results are not necessarily indicative of results for a full year. Convertible Senior Notes On March 5, 2021, we issued $500.0 million in aggregate principal amount of 0.25% Convertible Senior Notes due 2026, and on March 16, 2021, after the initial purchasers exercised their option to purchase additional securities in full, we issued an additional $75.0 million in aggregate principal amount of 0.25% Convertible Senior Notes due 2026, resulting in an aggregate principal amount of $575.0 million (collectively, the “Notes”). The total net proceeds from the offering, after deducting initial purchase discounts and issuance costs, were $561.8 million. Please refer to Note 7, “Debt” for additional information. In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amounts of the liability component was calculated by measuring the fair value of similar liabilities that do not have associated convertible features using a discounted cash flow model. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. This difference represents a debt discount that is amortized to interest expense over the respective terms of the Notes using the effective interest rate method. The equity component was recorded in additional paid-in capital and is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the related debt issuance costs, we allocated the total amount incurred to the liability and equity components of the Notes based on their relative values. Issuance costs attributable to the liability component are being amortized to interest expense over the contractual term of the Notes. The issuance costs attributable to the equity component were netted against the equity component representing the conversion option in additional paid-in capital. To the extent that we receive the Notes conversion requests prior to their maturity, a portion of the equity component is classified as temporary equity, which is measured as the difference between the principal and net carrying amount of the Notes requested for conversion. Upon settlement of the conversion requests, the difference between the fair value and the amortized book value of the liability component of the Notes requested for conversion is recorded as a gain or loss on early note conversion. The fair value of the Notes is measured based on a similar liability that does not have an associated convertible feature based on the remaining term of the Notes. Deferred Costs Deferred costs, which primarily consist of deferred sales commissions, included within Other assets on our condensed consolidated balance sheets were $131.8 million and $132.9 million as of June 30, 2021, and December 31, 2020, respectively. Amortization expense for the deferred costs was $11.3 million and $9.1 million for the three months ended June 30, 2021, and 2020, respectively, and $22.3 million and $18.1 million for the six months ended June 30, 2021, and 2020, respectively. Recently Issued Accounting Pronouncements from the Financial Accounting Standards Board Standard Issuance Date Description Adoption Date Effect on the Financial Statements Accounting Standards Update ("ASU") 2019-12 , Income Taxes (Topic 740) December 2019 These amendments simplify the accounting for income taxes, eliminates certain exceptions to the general principles in Topic 740 and clarifies certain aspects of the current guidance to improve consistent application among reporting entities. January 2021 The adoption of this standard did not have a significant impact on our financial statements. ASU 2020-06 , Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40) August 2020 This amendment simplifies the accounting for convertible instruments by removing certain separation models required under current GAAP for (1) convertible debt with a cash conversion feature and (2) convertible instruments with a beneficial conversion feature. As a result, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost. January 2022 We plan to adopt the guidance as of January 1, 2022, using the modified retrospective method of transition. Upon adoption, we expect to record a cumulative-effect adjustment to the opening balance of accumulated deficit on our consolidated balance sheet, primarily due to the reduction in non-cash interest expense associated with the historical separation of debt and equity components for our Notes. ASU 2020-04 , Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting March 2020 This amendment provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Not yet adopted This amendment may be elected over time through December 31, 2022 as reference rate reform activities occur. We do not expect the adoption of this guidance to have a significant impact on our financial statements.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2021
Business Combinations [Abstract]
Business Combinations	3. Business Combinations Ideal On April 30, 2021, we completed the purchase of 100% of the outstanding shares of O5 Systems, Inc. dba Ideal (“Ideal”) for $41.3 million, subject to a working capital adjustment. Ideal is a talent intelligence software provider based in Toronto, Ontario, Canada. The financial results of Ideal have been included within our condensed consolidated financial statements from the acquisition date forward and are classified as Cloud. For the three months ended June 30, 2021, Ideal revenue included within our condensed consolidated statement of operations was $0.7 million. The acquisition of Ideal was recorded using the acquisition method of accounting, in which the assets and liabilities assumed are recognized at their fair value. The purchase accounting has not been finalized as of June 30, 2021 but we have conducted a preliminary assessment of certain assets and liabilities related to the acquisition of Ideal. The intangible assets consist of developed technology, trade name, and customer relationships. The major classes of assets and liabilities to which we have preliminarily allocated the purchase price were as follows: (Dollars in millions) Cash and equivalents $ 2.6 Trade receivables, prepaid expenses, and other current assets 0.5 Property, plant, and equipment 0.1 Goodwill 26.7 Other intangible assets 18.3 Accounts payable and other current liabilities (3.6 ) Other non-current liabilities (3.3 ) Total purchase price $ 41.3 Ascender On March 1, 2021, we completed the purchase of 100% of the outstanding shares of Ascender HCM Pty Ltd. (“Ascender”) for $359.6 million, subject to working capital and other adjustments. Ascender is a payroll and human resources solutions provider in the Asia Pacific Japan region. The financial results of Ascender have been included within our condensed consolidated financial statements from the acquisition date forward and are classified among both Cloud and Bureau solutions. For the three and six months ended June 30, 2021, Ascender revenue included within our condensed consolidated statement of operations was $22.9 million and $29.6 million, respectively. The acquisition of Ascender was recorded using the acquisition method of accounting, in which the assets and liabilities assumed are recognized at their fair value. The purchase accounting has not been finalized as of June 30, 2021 but we have conducted a preliminary assessment of certain assets and liabilities related to the acquisition of Ascender. During the three months ended June 30, 2021, we continued to refine our purchase accounting, resulting in certain reclassifications among balance sheet accounts, primarily goodwill and other intangible assets. The intangible assets consist of customer relationships, trade name, and developed technology. The major classes of assets and liabilities to which we have preliminarily allocated the purchase price were as follows: (Dollars in millions) Cash and equivalents $ 3.1 Restricted cash 2.0 Trade receivables, prepaid expenses, and other current assets 15.7 Customer funds 18.9 Property, plant, and equipment and other assets 18.7 Goodwill 262.2 Other intangible assets 138.0 Accounts payable and other current liabilities (31.4 ) Customer funds obligations (18.8 ) Other non-current liabilities (48.8 ) Total purchase price $ 359.6 After consideration of the Ideal and Ascender acquisitions, management has concluded that we continue to have one operating and reportable segment. This conclusion aligns with how management monitors operating performance, allocates resources, and deploys capital. Pro forma financial information is not presented as neither the acquisition of Ideal nor Ascender qualified as a significant business combination.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	4. Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis Our financial assets and liabilities measured at fair value on a recurring basis were categorized as follows: June 30, 2021 Level 1 Level 2 Level 3 Total (Dollars in millions) Assets Available for sale customer funds assets $ — $ 1,721.4 (a) $ — $ 1,721.4 Total assets measured at fair value $ — $ 1,721.4 $ — $ 1,721.4 December 31, 2020 Level 1 Level 2 Level 3 Total (Dollars in millions) Assets Available for sale customer funds assets $ — $ 1,719.1 (a) $ — $ 1,719.1 Total assets measured at fair value $ — $ 1,719.1 $ — $ 1,719.1 (a) Fair value is based on inputs that are observable for the asset or liability, other than quoted prices. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Assets and liabilities acquired as part of business combinations and recognized as part of our convertible debt issuance have been recorded at fair value on a nonrecurring basis. Please refer to Note 3, “Business Combinations,” and Note 7, “Debt” for additional information.

Customer Funds

Customer Funds	6 Months Ended
	Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]
Customer Funds	5. Customer Funds In certain jurisdictions, we collect funds for payment of payroll and taxes; temporarily hold such funds until payment is due; remit the funds to the clients’ employees and appropriate taxing authorities; file federal, state, and local tax returns; and handle related regulatory correspondence and amendments. The customer assets are held in segregated accounts intended for the specific purpose of satisfying client fund obligations and therefore are not freely available for our general business use. In the U.S. and Canada, these customer funds are held in trusts. Investment income from invested customer funds , also referred to as float revenue or float, is a component of our compensation for providing services under agreements with our customers. Investment income from invested customer funds included in recurring revenue was $ 10.4 million and $ 11.5 million for the three months ended June 30, 2021 , and 2020 , respectively , and $ 21.1 million and $ 31.1 million for the six months ended June 30, 2021, and 2020 , respectively . Investment income includes interest income, realized gains and losses from sales of customer funds’ investments, and unrealized credit losses determined to be unrecoverable . The amortized cost of customer funds as of June 30, 2021, and December 31, 2020, is the original cost of assets acquired. The amortized cost and fair values of investments of customer funds available for sale were as follows: June 30, 2021 Amortized Gross Unrealized Fair Cost Gain Loss Value (Dollars in millions) Money market securities, investments carried at cost and other cash equivalents $ 1,479.0 $ — $ — $ 1,482.4 Available for sale investments: U.S. government and agency securities 558.4 15.5 (1.8 ) 572.1 Canadian and provincial government securities 407.5 10.4 (0.1 ) 417.8 Corporate debt securities 454.1 13.6 (0.5 ) 467.2 Asset-backed securities 184.6 3.1 — 187.7 Mortgage-backed securities 5.1 0.1 — 5.2 Other short-term investments 7.0 — — 7.0 Other securities 64.6 0.1 (0.3 ) 64.4 Total available for sale investments 1,681.3 42.8 (2.7 ) 1,721.4 Invested customer funds 3,160.3 $ 42.8 $ (2.7 ) 3,203.8 Receivables 11.6 11.6 Total customer funds $ 3,171.9 $ 3,215.4 December 31, 2020 Amortized Gross Unrealized Fair Cost Gain Loss Value (Dollars in millions) Money market securities, investments carried at cost and other cash equivalents $ 2,027.1 $ — $ — $ 2,027.1 Available for sale investments: U.S. government and agency securities 494.0 21.6 (0.1 ) 515.5 Canadian and provincial government securities 396.4 15.5 — 411.9 Corporate debt securities 548.5 19.4 — 567.9 Asset-backed securities 192.2 4.9 — 197.1 Mortgage-backed securities 9.9 0.2 — 10.1 Other securities 16.5 0.1 — 16.6 Total available for sale investments 1,657.5 61.7 (0.1 ) 1,719.1 Invested customer funds 3,684.6 $ 61.7 $ (0.1 ) 3,746.2 Receivables 13.2 13.2 Total customer funds $ 3,697.8 $ 3,759.4 The following represents the gross unrealized losses and the related fair value of the investments of customer funds available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position. June 30, 2021 Less than 12 months 12 months or more Total Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value (Dollars in millions) U.S. government and agency securities $ (1.8 ) $ 172.0 $ — $ — $ (1.8 ) $ 172.0 Canadian and provincial government securities (0.1 ) 19.0 — — (0.1 ) 19.0 Corporate debt securities (0.5 ) 68.4 — — (0.5 ) 68.4 Asset-backed securities — 16.5 — — — 16.5 Other securities (0.3 ) 43.0 — — (0.3 ) 43.0 Total available for sale investments $ (2.7 ) $ 318.9 $ — $ — $ (2.7 ) $ 318.9 Management does not believe that any individual unrealized loss was unrecoverable as of June 30, 2021. The unrealized losses are primarily attributable to changes in interest rates and not to credit deterioration. We currently do not intend to sell or expect to be required to sell the securities before the time required to recover the amortized cost. The amortized cost and fair value of investment securities available for sale at June 30, 2021, by contractual maturity are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or to prepay obligations with or without call or prepayment penalties. June 30, 2021 Cost Fair Value (Dollars in millions) Due in one year or less $ 1,923.5 $ 1,931.6 Due in one to three years 688.6 712.4 Due in three to five years 402.8 407.5 Due after five years 145.4 152.3 Invested customer funds $ 3,160.3 $ 3,203.8

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	6. Goodwill and Intangible Assets Goodwill Goodwill and changes therein were as follows: (Dollars in millions) Balance at December 31, 2019 $ 1,973.5 Acquisition 42.7 Translation 15.6 Balance at December 31, 2020 2,031.8 Acquisitions 288.9 Translation 8.8 Balance at June 30, 2021 $ 2,329.5 Please refer to Note 3, “Business Combinations,” for further discussion of the Ascender and Ideal acquisitions. Intangible Assets Other intangible assets consisted of the following: June 30, 2021 Gross Carrying Amount Accumulated Amortization Net Estimated Life Range (Years) (Dollars in millions) Customer lists and relationships $ 306.9 $ (217.4 ) $ 89.5 4-15 Trade name 184.5 (2.9 ) 181.6 3-5 and Indefinite Technology 233.6 (163.5 ) 70.1 3-5 Total other intangible assets $ 725.0 $ (383.8 ) $ 341.2 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Estimated Life Range (Years) (Dollars in millions) Customer lists and relationships $ 229.0 $ (212.1 ) $ 16.9 5-15 Trade name 177.7 (2.5 ) 175.2 3-5 and Indefinite Technology 159.5 (156.6 ) 2.9 3-4 Total other intangible assets $ 566.2 $ (371.2 ) $ 195.0 We perform an impairment assessment of our indefinite-lived trade name intangible assets as of October 1 of each year. We continue to evaluate the use of our trade names and branding in our sales and marketing efforts. If there is a fundamental shift in the method of our branding in the future, we will assess the impact on the carrying amount of our trade name intangible assets to determine whether an impairment exists. If it is determined that an impairment has occurred, it would be recognized during the period in which the decision was made to make the fundamental shift. Amortization expense related to definite-lived intangible assets was $9.8 million and $0.4 million for the three months ended June 30, 2021, and 2020, respectively, and $12.0 million and $0.7 million for the six months ended June 30, 2021, and 2020 respectively.

Debt

Debt	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt	7. Debt Overview Our debt obligations consisted of the following as of the periods presented: June 30, December 31, 2021 2020 (Dollars in millions) Term Debt, interest rate of 2.6% $ 661.3 $ 664.7 Revolving Credit Facility ($300.0 million available capacity less amounts reserved for letters of credit, which were $0.4 million and $0.4 million, respectively) — — Convertible Senior Notes, interest rate of 0.25% 575.0 — Australia Line of Credit (AUD $4.2 million letter of credit capacity, which was fully utilized; USD $3.1 million and USD $0 million, respectively) — — Canada Line of Credit (CAD $7.0 million letter of credit capacity, which was fully utilized; USD $5.6million and USD $5.4 million, respectively) — — Financing lease liabilities (Please refer to Note 13) 10.2 8.8 Total debt 1,246.5 673.5 Less unamortized discount on Term Debt and Convertible Senior Notes 104.7 1.2 Less unamortized debt issuance costs on Term Debt and Convertible Senior Notes 15.0 4.5 Less current portion of long-term debt 8.3 7.2 Long-term debt, less current portion $ 1,118.5 $ 660.6 Accrued interest and fees related to the debt obligations was $0.5 million and $0.1 million as of June 30, 2021, and December 31, 2020, respectively, and is included within Other accrued expenses in our condensed consolidated balance sheets. Senior Secured Credit Facility On April 30, 2018, we completed the refinancing of our debt by entering into a new credit agreement. Pursuant to the terms of the new credit agreement, we became borrower of (i) a $680.0 million term loan debt facility (the “Term Debt”) and (ii) a $300.0 million revolving credit facility (the “Revolving Credit Facility”) (collectively, the “Senior Secured Credit Facility”). The obligations of Ceridian under the Senior Secured Credit Facility are secured by first priority security interests in substantially all of the assets of Ceridian and the domestic subsidiary guarantors, subject to permitted liens and certain exceptions. The Term Debt has a maturity date of April 30, 2025, and the Revolving Credit Facility has a maturity date of April 30, 2023. Convertible Senior Notes In March 2021, we issued $575.0 million in aggregate principal amount of 0.25% Convertible Senior Notes due 2026 in a private offering to qualified institutional buyers pursuant to Rule 144A promulgated under the Securities Act of 1933, as amended, and pursuant to exemptions from the prospectus requirements of applicable Canadian securities laws, including the exercise in full by the initial purchasers of their option to purchase an additional $75.0 million in aggregate principal amount of 0.25% Convertible Senior Notes due 2026 (collectively, the “Notes”). The Notes bear interest at a rate of 0.25% per year and interest is payable semiannually in arrears on March 15 and September 15 of each year, beginning on September 15, 2021. The Notes mature on March 15, 2026, unless earlier converted, redeemed or repurchased. The total net proceeds from the offering, after deducting initial purchase discounts and other debt issuance costs, were $561.8 million. The Notes are unsecured obligations and do not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness or the issuance or repurchase of securities by us or any of our subsidiaries. The following table presents details of the Notes: Initial Conversion Rate per $1,000 Principal Initial Conversion Price per Share Notes 7.5641 shares $132.20 The Notes will be convertible at the option of the holders at any time only under the following circumstances: • During any calendar quarter commencing after the calendar quarter ending on June 30, 2021, if the last reported sale price per share of our common stock exceeds 130% of the conversion price for each of at least 20 trading days during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter; • During the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of our common stock on such trading day and the conversion rate on such trading day; • Upon the occurrence of certain corporate events or distributions on our common stock, as described in the indenture under which the Notes were issued; • If we call such • At any time from, and including, September 15, 2025 until the close of business on the second scheduled trading day immediately before the maturity date. Upon conversion, we may satisfy the conversion obligation by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, in the manner and subject to the terms and conditions provided in the indenture under which the Notes were issued. During the quarter ended June 30, 2021, the conditions allowing holders of the Notes to convert have not been met. The Notes were therefore not convertible during the second quarter of 2021 and are classified as a noncurrent liability in our condensed consolidated balance sheet as of June 30, 2021. We may not redeem the Notes prior to March 20, 2024. On or after March 20, 2024, and on or before the 30th scheduled trading day immediately preceding the maturity date, we may redeem the Notes at a cash purchase price equal to the principal amount of the Notes to be redeemed, plus accrued and unpaid interest, if any, but only if the last reported sale price per share of our common stock exceeds 130% of the conversion price on (1) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date we send the related redemption notice; and (2) the trading day immediately before the date we send such notice. In addition, calling any Note for redemption will constitute a make-whole fundamental change with respect to that Note, in which case the conversion rate applicable to the conversion of that Note will be increased in certain circumstances if it is converted after it is called for redemption. If a “fundamental change” (as defined in the indenture under which the Notes were issued) occurs, then noteholders may require us to repurchase their notes at a cash repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any. In accounting for the issuance of the Notes and the related transaction costs, we separated the Notes into liability and equity components. The carrying amount of the liability component was initially calculated by measuring the fair value of similar liabilities that do not have associated convertible features utilizing the interest rate of 4.5%. The carrying amount of the equity component representing the conversion option was $108.6 million and was determined by deducting the fair value of the liability component from the par value of the Notes. This difference represents a debt discount that is amortized to interest expense over the term of the Notes using the effective interest rate method. The equity component was recorded in additional paid-in capital and is not remeasured as long as it continues to meet the conditions for equity classification. Total issuance costs of $14.4 million related to the Notes were allocated between liability, totaling $11.7 million, and equity, totaling $2.7 million, in the same proportion as the allocation of the total proceeds to the liability and equity components. Issuance costs attributable to the liability component are being amortized to interest expense over the term of the Notes. The excess of the principal amount of the liability component over its carrying amount is amortized to interest expense over the contractual term of the Notes at an effective interest rate of 5.1%. The issuance costs attributable to the equity component were netted against additional paid-in capital. The amount recorded for the equity component of the Notes was $77.7 million, net of allocated issuance costs of $2.7 million and deferred tax impact of $28.2 million. The following table sets forth total interest expense recognized related to the Notes for the period: Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 (Dollars in millions) Contractual interest expense $ 0.4 $ 0.5 Amortization of debt discount 4.4 5.1 Amortization of debt issuance costs 0.5 0.6 Total $ 5.3 $ 6.2 Capped Calls In March 2021, in connection with the pricing of the Notes, we entered into capped call transactions with the option counterparties (the “Capped Calls”). The Capped Calls each have an initial strike price of $132.20 per share, and an initial cap price of $179.26 per share, both subject to certain adjustments. The capped call transactions are generally expected to reduce potential dilution to our common stock upon any conversion of the Notes and/or offset any potential cash payments we would be required to make in excess of the principal amount of converted Notes, as the case may be, with such reduction and/or offset subject to a cap based on the cap price. For accounting purposes, the Capped Calls are separate transactions, and not part of the terms of the Notes. As the Capped Calls qualify for a scope exception from derivative accounting for instruments that are both indexed to the issuer's own stock and classified in stockholder’s equity in our condensed consolidated balance sheet, we have recorded an amount of $33.0 million as a reduction to additional paid-in capital which will not be remeasured. This represents the premium of $45.0 million paid for the purchase of the Capped Calls, net of the deferred tax impact of $12.0 million. Future Payments and Maturities of Debt The future principal payments and maturities of our indebtedness, excluding financing lease obligations, are as follows: Years Ending December 31, Amount (Dollars in millions) Remainder of 2021 $ 3.4 2022 6.8 2023 6.8 2024 6.8 2025 637.5 Thereafter 575.0 $ 1,236.3 Fair Value of Debt Our debt does not trade in active markets. Based on the borrowing rates currently available to us for bank loans with similar terms and average maturities, the trading price of our common stock and the limited trades of our debt, the fair value of our debt was estimated to be $1,232.8 million and $657.6 million as of June 30, 2021, and December 31, 2020, respectively. The fair value of the Notes was determined based on the closing trading price per $1,000 of the Notes as of the last day of trading for the period. We consider the fair value of the Notes at June 30, 2021 to be a Level 2 measurement as they are not actively traded. The fair value of the Notes is primarily affected by the trading price of our common stock and market interest rates.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2021
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	8. Employee Benefit Plans The components of net periodic cost for our defined benefit pension plan and for our postretirement benefit plan are included in the following tables: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net Periodic Pension Cost (Dollars in millions) Interest cost $ 1.7 $ 3.2 $ 3.4 $ 6.4 Actuarial loss amortization 4.3 3.9 8.6 7.8 Less: Expected return on plan assets (3.3 ) (5.7 ) (6.6 ) (11.4 ) Net periodic pension cost $ 2.7 $ 1.4 $ 5.4 $ 2.8 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net Periodic Postretirement Benefit (Dollars in millions) Interest cost $ 0.1 $ 0.2 $ 0.1 $ 0.3 Actuarial gain amortization (0.5 ) (0.6 ) (1.0 ) (1.2 ) Prior service credit amortization (0.1 ) (0.1 ) (0.1 ) (0.2 ) Net periodic postretirement benefit gain $ (0.5 ) $ (0.5 ) $ (1.0 ) $ (1.1 )

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Share-Based Compensation	9. Share-Based Compensation Our share-based compensation consists of performance-based stock options, term-based stock options, restricted stock units (“RSUs”), and performance-based stock units (“PSUs”). We also offer an employee stock purchase plan. Prior to November 1, 2013, Ceridian employees participated in a share-based compensation plan of the former ultimate parent of Ceridian, the 2007 Stock Incentive Plan (“2007 SIP”). Effective November 1, 2013, although most participants who held stock options under the 2007 SIP converted their options to a newly created option plan, the 2013 Ceridian HCM Holding Inc. Stock Incentive Plan, as amended (“2013 SIP”), a small number of participants maintained their stock options in the 2007 SIP. Concurrent with the initial public offering (“IPO”) and legal reorganization, all outstanding stock options under the 2007 SIP were converted into options to purchase common stock of Ceridian. As of June 30, 2021, there were 1,936 stock options outstanding under the 2007 SIP. Stock options awarded under the 2013 SIP vest either annually on a pro rata basis over a four- or five-year On April 24, 2018, in connection with our initial public offering, the Board of Directors and our stockholders approved the Ceridian HCM Holding Inc. 2018 Equity Incentive Plan (“2018 EIP”), which authorized the issuance of up to 13,500,000 shares of common stock to eligible participants through equity awards (the “Share Reserve”). The Share Reserve may be increased on March 31 of each of the first ten calendar years during the term of the 2018 EIP, by the lesser of (i) three percent of the number of shares of our common stock outstanding on each January 31 immediately prior to the date of increase or (ii) such number of shares of our common stock determined by the Board of Directors. Effective on March 31, 2021, the Share Reserve was increased by 4,397,296 shares, pursuant to the terms of the 2018 EIP. Equity awards under the 2018 EIP vest either annually or quarterly on a pro rata basis, generally over a one-, three-, or four-year Total share-based compensation expense was $31.4 million and $15.3 million for the three months ended June 30, 2021, and 2020, respectively, and $54.2 million and $27.8 million for the six months ended June 30, 2021, and 2020, respectively. Performance-Based Stock Options Performance-based stock option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP was as follows: Shares Weighted Average Exercise Price (per share) Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in millions) Performance-based options outstanding at December 31, 2020 1,844,279 $ 64.55 9.2 $ 77.5 Granted — — — — Exercised (3,850 ) (13.46 ) — — Forfeited or expired (1,347 ) — — — Performance-based options outstanding at June 30, 2021 1,839,082 $ 64.65 8.8 $ 57.5 Performance-based options exercisable at June 30, 2021 21,701 $ 13.83 1.1 $ 1.8 In 2020, 1,500,000 performance-based stock options (“Performance Option Award”) were granted under the 2018 EIP with an exercise price of $65.26. The vesting conditions for the Performance Option Award are based on the Company’s performance on the New York Stock Exchange (“NYSE”) with 750,000 shares available to vest when the Company’s per share closing price on the NYSE meets or exceeds $110.94, or 1.7 times the exercise price, for ten consecutive trading days, and the remaining 750,000 shares are available to vest when the Company’s per share closing price on the NYSE meets or exceeds $130.52, or 2.0 times the exercise price, for ten consecutive trading days. The Performance Option Award has a minimum time-based vesting period of 3 years. The vesting conditions must be achieved prior to May 8, 2025, or any unvested portion of the Performance Option Award will terminate. A Monte Carlo simulation model was used to determine the fair value of these performance-based stock options. The Monte Carlo model utilizes multiple input variables that determine the probability of satisfying the market conditions stipulated in the award. We have estimated an expected term of 5.3 years, based on the vesting period and contractual term. As of June 30, 2021 , which is expected to be recognized over a weighted average period of 2.8 years. Term-Based Stock Options Term-based stock option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP was as follows: Shares Weighted Average Exercise Price (per share) Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in millions) Term-based options outstanding at December 31, 2020 10,983,074 $ 40.47 7.8 $ 725.9 Granted 755,688 83.99 — — Exercised (929,544 ) (22.17 ) — — Forfeited or expired (122,079 ) (49.20 ) — — Term-based options outstanding at June 30, 2021 10,687,139 $ 44.26 7.5 $ 552.1 Term-based options exercisable at June 30, 2021 5,058,708 $ 34.14 6.9 $ 312.5 As of June 30, 2021, there was $88.8 million of share-based compensation expense related to unvested term-based stock options not yet recognized, which is expected to be recognized over a weighted average period of 1.6 years. Restricted Stock Units RSU activity under the 2013 SIP and the 2018 EIP was as follows: Shares RSUs outstanding at December 31, 2020 1,389,385 Granted 793,698 Shares issued upon vesting of RSUs (168,117 ) Forfeited or canceled (25,914 ) RSUs outstanding at June 30, 2021 1,989,052 RSUs releasable at June 30, 2021 570,021 During the six months ended June 30, 2021, 573,029 RSUs vested. As of June 30, 2021, there were 1,419,031 unvested RSUs outstanding and 570,021 vested RSUs outstanding. As of June 30, 2021, there was $89.9 million of share-based compensation expense related to unvested RSUs not yet recognized, which is expected to be recognized over a weighted average period of 1.6 years. Performance Stock Units PSU activity under the 2018 EIP was as follows: Shares PSUs outstanding at December 31, 2020 135,220 Granted 343,233 Shares issued upon vesting of PSUs (1,148 ) Forfeited or canceled (140,692 ) PSUs outstanding at June 30, 2021 336,613 PSUs releasable at June 30, 2021 — The vesting conditions for the PSUs granted in 2020 were based on the Company’s performance criteria, including Cloud revenue and adjusted EBITDA margin goals under Ceridian HCM Holding Inc. 2020 Management Incentive Plan (the “2020 MIP”) for the incentive period of January 1, 2020 through December 31, 2020. The vesting conditions for the PSUs granted in connection with the 2020 MIP were not met for the incentive period and as a result, the PSUs did not vest and were canceled. The vesting conditions for the PSUs granted in 2021 are based on the Company’s performance criteria, including Cloud revenue and adjusted EBITDA margin goals under the Ceridian HCM Holding Inc. 2021 Management Incentive Plan (the “2021 MIP”) for the incentive period of January 1, 2021 through December 31, 2021. The maximum incentive vesting of PSUs may not exceed 150% under the 2021 MIP. Both the Cloud revenue and adjusted EBITDA margin goals are calculated based on the Company’s operating results, adjusted for foreign currency and interest rate impacts plus other unique impacts as approved by the Compensation Committee or the Board of Directors. Upon vesting of a PSU, a participant will receive shares of common stock of the Company. The probability of vesting of PSUs will continue to be evaluated throughout the period, and share-based compensation expense will be recognized in accordance with that probability. As of June 30, 2021 Global Employee Stock Purchase Plan On November 9, 2018, the Board of Directors approved the Ceridian HCM Holding Inc. Global Employee Stock Purchase Plan (“GESPP”), and the Company’s stockholders approved the GESPP on May 1, 2019. The GESPP authorizes the issuance of up to 2,500,000 shares of common stock to eligible participants through purchases via payroll deductions. A total of 1,976,113 shares of common stock are available for future issuances under the plan as of June 30, 2021. The purchase price is the lower of (i) 85% of the fair market value of a share of common stock on the offering date (the first trading day of the offering period commencing on January 1 and concluding on December 31) or (ii) 85% of the fair market value of a share of common stock on the purchase date. The GESPP shall continue for ten years, unless terminated sooner as provided under the GESPP. Quarterly purchase periods commence on January 1, April 1, July 1, and October 1 and shares are purchased on the last trading day of the respective purchase periods. Our GESPP activity was as follows: Period Ended Shares Issued Purchase Price (per share) March 31, 2021 39,484 $ 71.63 June 30, 2021 39,440 81.53

Revenue

Revenue	6 Months Ended
	Jun. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue	10. Revenue Disaggregation of Revenue Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (Dollars in millions) Revenue: Cloud Dayforce Recurring $ 150.6 $ 118.5 $ 295.9 $ 246.6 Professional services and other 38.0 33.0 74.8 73.7 Total Dayforce revenue 188.6 151.5 370.7 320.3 Powerpay Recurring 20.5 16.2 40.8 38.0 Professional services and other 0.3 0.2 0.6 0.5 Total Powerpay revenue 20.8 16.4 41.4 38.5 Total Cloud revenue 209.4 167.9 412.1 358.8 Bureau Recurring 37.0 24.4 67.4 56.0 Professional services and other 4.0 0.3 5.4 0.5 Total Bureau revenue 41.0 24.7 72.8 56.5 Total revenue $ 250.4 $ 192.6 $ 484.9 $ 415.3 Recurring revenue includes float revenue of $10.4 million and $11.5 million for the three months ended June 30, 2021, and 2020, respectively, and $21.1 million and $31.1 million for the six months ended June 30, 2021, and 2020, respectively. Contract Balances A contract asset is generally recorded when revenue recognized for professional service performance obligations exceed the contractual amount of billings for implementation related professional services. Contract assets were $61.3 million and $55.2 million as of June 30, 2021, and December 31, 2020, respectively. Contract assets expected to be recognized in revenue within twelve months are included within Prepaid expenses and other current assets, with the remaining contract assets included within Other assets on our condensed consolidated balance sheets. Deferred Revenue Deferred revenue primarily consists of payments received in advance of revenue recognition. The changes in deferred revenue were as follows: Six Months Ended June 30, 2021 2020 (Dollars in millions) Deferred revenue, beginning of period $ 24.4 $ 25.5 New billings 244.0 196.1 Acquired billings 17.0 — Revenue recognized (241.7 ) (197.2 ) Effect of exchange rate (0.5 ) (0.4 ) Deferred revenue, end of period $ 43.2 $ 24.0 Transaction Price for Remaining Performance Obligations In accordance with ASC Topic 606, “Revenue from Contracts with Customers,” the following represents the aggregate amount of transaction price allocated to the remaining performance obligations that are unsatisfied as of the end of the reporting period. As of June 30, 2021, approximately $1,027.0 million of revenue is expected to be recognized over the next three years from remaining performance obligations, which represents contracted revenue for recurring services and fixed price professional services, primarily implementation services, that has not yet been recognized, including deferred revenue and unbilled amounts that will be recognized as revenue in future periods. In accordance with the practical expedient provided in ASC Topic 606, performance obligations that are billed and recognized as they are delivered, primarily professional services contracts that are on a time and materials basis, are excluded from the transaction price for remaining performance obligations disclosed above.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Loss	11. Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss were as follows: Foreign Currency Translation Adjustment Unrealized Gain (Loss) from Invested Customer Funds Pension Liability Adjustment Total (Dollars in millions) Balance as of December 31, 2020 $ (159.7 ) $ 38.4 $ (154.7 ) $ (276.0 ) Other comprehensive income (loss) before income taxes and reclassifications 24.0 (22.1 ) 0.1 2.0 Income tax benefit (expense) — 5.8 (2.0 ) 3.8 Reclassifications to earnings — — 7.5 7.5 Other comprehensive (loss) income 24.0 (16.3 ) 5.6 13.3 Balance as of June 30, 2021 $ (135.7 ) $ 22.1 $ (149.1 ) $ (262.7 )

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes Our income tax provision represents federal, state, and international taxes on our income recognized for financial statement purposes and includes the effects of temporary differences between financial statement income and income recognized for tax return purposes. Deferred tax assets and liabilities are recorded for temporary differences between the financial reporting basis and the tax basis of assets and liabilities as adjusted for the expected benefits of utilizing net operating loss carryforwards. We record a valuation allowance to reduce our deferred tax assets to reflect the net deferred tax assets that we believe will be realized. In assessing the likelihood that we will be able to recover our deferred tax assets and the need for a valuation allowance, we consider all available evidence, both positive and negative, including historical levels of pre-tax book income, expiration of net operating losses, expectations and risks associated with estimates of future taxable income, and ongoing prudent and feasible tax planning strategies, as well as current tax laws. We recorded an income tax benefit of $5.4 million during the six months ended June 30, 2021, consisting of a $10.6 million tax benefit from current operations, a $3.5 million U.S. state tax benefit, a $1.9 million tax reduction attributed to foreign withholding tax, and a $1.9 million tax reduction attributed to the release of tax reserves, partially offset by tax expense of $2.4 million related to non-deductible share-based compensation, $5.3 million attributed to the base erosion anti-abuse tax (“BEAT”) in the U.S., $2.4 million attributed to the international tax rate differential, and other tax expense items of $2.4 million. There were no unrecognized tax benefits as of June 30, 2021. The total amount of unrecognized tax benefits as of December 31, 2020 were $1.8 million, including $0.3 million of accrued interest. We make adjustments to these reserves when facts and circumstances change, such as the closing of tax audit or the refinement of an estimate. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on our financial condition and operating results. For the six months ended June 30, 2021, we released $1.8 million of our reserve primarily attributable to the conclusion of foreign tax audits. It is reasonable to expect that the amount of unrecognized tax benefits could change in the next twelve months; however, we do not expect the change to have a significant impact on our results of operations or financial condition. We file income tax returns in the U.S. federal jurisdiction, various states, and foreign jurisdictions. With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2016.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	13. Leases Supplemental balance sheet information related to leases was as follows: Lease Type Balance Sheet Classification June 30, 2021 December 31, 2020 (Dollars in millions) ASSETS Operating lease assets Trade and other receivables, net $ — $ 5.4 Operating lease assets Prepaid expenses and other current assets 2.7 2.2 Operating lease assets Right of use lease asset 33.6 27.9 Financing lease assets Property, plant, and equipment, net 8.9 8.0 Total lease assets $ 45.2 $ 43.5 LIABILITIES Current Financing lease liabilities Current portion of long-term debt $ 1.5 $ 0.4 Operating lease liabilities Current portion of long-term lease liabilities 10.0 10.5 Noncurrent Financing lease liabilities Long-term debt, less current portion 8.7 8.4 Operating lease liabilities Long-term lease liabilities, less current portion 41.4 33.6 Total lease liabilities $ 61.6 $ 52.9 The components of lease expense were as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Lease Cost (Dollars in millions) Operating lease cost $ 1.4 $ 2.3 $ 2.6 $ 4.6 Financing lease cost: Depreciation of lease assets 0.3 0.2 0.7 0.4 Interest on lease liabilities 0.1 0.1 0.1 0.2 Sublease income (0.7 ) (1.1 ) (1.3 ) (2.1 ) Total lease cost, net $ 1.1 $ 1.5 $ 2.1 $ 3.1

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	14. Commitments and Contingencies Legal Matters We are subject to claims and a number of judicial and administrative proceedings considered normal in the course of our current and past operations, including employment-related disputes, contract disputes, disputes with our competitors, intellectual property disputes, government audits and proceedings, customer disputes, and tort claims. In some proceedings, the claimant seeks damages as well as other relief, which, if granted, would require substantial expenditures on our part. Our general terms and conditions in customer contracts frequently include a provision indicating that we will indemnify and hold our customers harmless from and against any and all claims alleging that the services and materials furnished by us violate any third party’s patent, trade secret, copyright or other intellectual property right. We are not aware of any material pending litigation concerning these indemnifications. Some of these matters raise difficult and complex factual and legal issues and are subject to many uncertainties, including the facts and circumstances of each particular action, and the jurisdiction, forum, and law under which each action is proceeding. Because of these complexities, final disposition of some of these proceedings may not occur for several years. As such, we are not always able to estimate the amount of our possible future liabilities, if any. There can be no certainty that we may not ultimately incur charges in excess of presently established or future financial accruals or insurance coverage. Although occasional adverse decisions or settlements may occur, it is management’s opinion that the final disposition of these proceedings will not, considering the merits of the claims and available resources or reserves and insurance, and based upon the facts and circumstances currently known, have a material adverse effect on our financial position or results of operations.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	15. Related Party Transactions We provide Dayforce and related services to certain companies that are considered related parties. The revenue from these related parties was as follows: Three Months Ended June 30, Six Months Ended June 30, Counter-Party Related Persons Interest 2021 2020 2021 2020 (Dollars in millions) FleetCor Technologies, Inc. Shared board members. One board member is also the chief executive officer and the chairman of the counter-party's board $ 0.2 $ 0.2 $ 0.3 $ 0.5 The Stronach Group The brother of our chief executive officer ("CEO") was formerly the chief executive officer, and is currently a minority shareholder — 0.1 0.1 0.1 Verve Senior Living Our CEO and the brother of our CEO are currently minority shareholders 0.1 — 0.2 — Fidelity National Financial, Inc. Shared board members 0.2 0.1 0.2 0.1 Essex Technology Group, LLC Portfolio company of Thomas H. Lee Partners, L.P. ("THL"), of which certain members of our board are managing directors 0.1 0.2 0.3 0.3 Guaranteed Rate, Inc. Portfolio company of THL, of which certain members of our board are managing directors 0.4 0.1 0.9 0.3 HighTower Advisors, LLC Portfolio company of THL, of which certain members of our board are managing directors. One board member also serves on the board of the counter-party 0.1 — 0.1 — Ten-X, LLC Portfolio company of THL, of which certain members of our board are managing directors — 0.1 0.1 0.1 Philips Feed Services Portfolio company of THL, of which certain members of our board are managing directors 0.1 0.1 0.1 0.1 The Dun and Bradstreet Corporation Shared board members with Dun & Bradstreet Holdings, Inc., which owns the counter-party * — * — *We have entered into a contract to provide Dayforce and related services to The Dun and Bradstreet Corporation. We are party to service agreements with certain companies that are considered related parties. Payments made to the related parties were as follows: Three Months Ended June 30, Six Months Ended June 30, Counter-Party Related Persons Interest 2021 2020 2021 2020 (Dollars in millions) The Dun and Bradstreet Corporation Shared board members with Dun & Bradstreet Holdings, Inc., which owns the counter-party $ 0.1 $ 0.4 $ 0.4 $ 0.4 Manulife Financial Shared board members. Our President and Chief Operating Officer also serves as a director $ 2.1 $ 1.9 $ 4.1 $ 3.8

Net Income (Loss) per Share

Net Income (Loss) per Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Net Income (Loss) per Share	16. Net Income (Loss) per Share We compute net income (loss) per share of common stock using the treasury stock method. The basic and diluted net income (loss) per share computations were calculated as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (Dollars in millions, except share and per share data) Numerator: Net (loss) income $ (25.8 ) $ 5.5 $ (45.0 ) $ 14.1 Denominator: Weighted-average shares outstanding - basic 149,293,833 145,593,019 149,006,538 145,119,172 Effect of dilutive equity instruments — 5,851,882 — 6,201,921 Weighted-average shares outstanding - diluted 149,293,833 151,444,901 149,006,538 151,321,093 Net (loss) income per share - basic $ (0.17 ) $ 0.04 $ (0.30 ) $ 0.10 Net (loss) income per share - diluted $ (0.17 ) $ 0.04 $ (0.30 ) $ 0.09 The following potentially dilutive weighted-average shares were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Stock options 5,542,424 2,511,973 5,496,018 1,316,676 Restricted stock units 458,018 60,460 500,064 41,119 Performance stock units 729,104 — 667,903 — The shares underlying the conversion option in the Notes were not considered in the calculation of diluted net income (loss) per share as the effect would have been anti-dilutive. Based on the initial conversion price, the entire outstanding principal amount of the Notes as of June 30, 2021 would have been convertible into approximately 4.3 million shares of our common stock. Since we expect to settle the principle amount of the Notes in cash, we use the treasury stock method for calculating any potential dilutive effect on diluted net income per share, if applicable. As a result, only the amount by which the conversion value exceeds the aggregate principal amount of the Notes (the “conversion spread”) is considered in the diluted earnings per share computation. The conversion spread has a dilutive impact on diluted net income per share when the average market price of our common stock for a given period exceeds the initial conversion price of $132.20 per share for the Notes. We excluded the potentially dilutive effect of the conversion spread of the Notes as the average market price of our common stock during the three and six months ended June 30, 2021 was less than the conversion price of the Notes. In connection with the issuance of the Notes, we entered into Capped Calls, which were not included for purposes of calculating the number of diluted shares outstanding, as their effect would have been anti-dilutive.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information. Accordingly, the unaudited condensed consolidated financial statements do not include all of the information and notes required by GAAP for complete financial statements. The accounting policies we follow are set forth in Note 2, “Summary of Significant Accounting Policies,” to our audited consolidated financial statements in our 2020 Form 10-K 2020 Form 10-K In the opinion of management, the unaudited condensed consolidated financial statements contained herein reflect all adjustments (consisting only of normal recurring adjustments, except as set forth in these notes to condensed consolidated financial statements) necessary to present fairly in all material aspects the financial position, results of operations, comprehensive income (loss), and cash flows from all periods presented. Interim results are not necessarily indicative of results for a full year.
Convertible Senior Notes	Convertible Senior Notes On March 5, 2021, we issued $500.0 million in aggregate principal amount of 0.25% Convertible Senior Notes due 2026, and on March 16, 2021, after the initial purchasers exercised their option to purchase additional securities in full, we issued an additional $75.0 million in aggregate principal amount of 0.25% Convertible Senior Notes due 2026, resulting in an aggregate principal amount of $575.0 million (collectively, the “Notes”). The total net proceeds from the offering, after deducting initial purchase discounts and issuance costs, were $561.8 million. Please refer to Note 7, “Debt” for additional information. In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying amounts of the liability component was calculated by measuring the fair value of similar liabilities that do not have associated convertible features using a discounted cash flow model. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes as a whole. This difference represents a debt discount that is amortized to interest expense over the respective terms of the Notes using the effective interest rate method. The equity component was recorded in additional paid-in capital and is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the related debt issuance costs, we allocated the total amount incurred to the liability and equity components of the Notes based on their relative values. Issuance costs attributable to the liability component are being amortized to interest expense over the contractual term of the Notes. The issuance costs attributable to the equity component were netted against the equity component representing the conversion option in additional paid-in capital. To the extent that we receive the Notes conversion requests prior to their maturity, a portion of the equity component is classified as temporary equity, which is measured as the difference between the principal and net carrying amount of the Notes requested for conversion. Upon settlement of the conversion requests, the difference between the fair value and the amortized book value of the liability component of the Notes requested for conversion is recorded as a gain or loss on early note conversion. The fair value of the Notes is measured based on a similar liability that does not have an associated convertible feature based on the remaining term of the Notes.
Deferred Costs	Deferred Costs Deferred costs, which primarily consist of deferred sales commissions, included within Other assets on our condensed consolidated balance sheets were $131.8 million and $132.9 million as of June 30, 2021, and December 31, 2020, respectively. Amortization expense for the deferred costs was $11.3 million and $9.1 million for the three months ended June 30, 2021, and 2020, respectively, and $22.3 million and $18.1 million for the six months ended June 30, 2021, and 2020, respectively.
Recently Issued Accounting Pronouncements from the Financial Accounting Standards Board	Recently Issued Accounting Pronouncements from the Financial Accounting Standards Board Standard Issuance Date Description Adoption Date Effect on the Financial Statements Accounting Standards Update ("ASU") 2019-12 , Income Taxes (Topic 740) December 2019 These amendments simplify the accounting for income taxes, eliminates certain exceptions to the general principles in Topic 740 and clarifies certain aspects of the current guidance to improve consistent application among reporting entities. January 2021 The adoption of this standard did not have a significant impact on our financial statements. ASU 2020-06 , Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40) August 2020 This amendment simplifies the accounting for convertible instruments by removing certain separation models required under current GAAP for (1) convertible debt with a cash conversion feature and (2) convertible instruments with a beneficial conversion feature. As a result, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost. January 2022 We plan to adopt the guidance as of January 1, 2022, using the modified retrospective method of transition. Upon adoption, we expect to record a cumulative-effect adjustment to the opening balance of accumulated deficit on our consolidated balance sheet, primarily due to the reduction in non-cash interest expense associated with the historical separation of debt and equity components for our Notes. ASU 2020-04 , Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting March 2020 This amendment provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. Not yet adopted This amendment may be elected over time through December 31, 2022 as reference rate reform activities occur. We do not expect the adoption of this guidance to have a significant impact on our financial statements.

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2021
Ideal [Member]
Business Acquisition [Line Items]
Schedule of Major Classes of Assets and Liabilities Preliminarily Allocated to Purchase Price	The major classes of assets and liabilities to which we have preliminarily allocated the purchase price were as follows: (Dollars in millions) Cash and equivalents $ 2.6 Trade receivables, prepaid expenses, and other current assets 0.5 Property, plant, and equipment 0.1 Goodwill 26.7 Other intangible assets 18.3 Accounts payable and other current liabilities (3.6 ) Other non-current liabilities (3.3 ) Total purchase price $ 41.3
Ascender HCM Pty Ltd. [Member]
Business Acquisition [Line Items]
Schedule of Major Classes of Assets and Liabilities Preliminarily Allocated to Purchase Price	The major classes of assets and liabilities to which we have preliminarily allocated the purchase price were as follows: (Dollars in millions) Cash and equivalents $ 3.1 Restricted cash 2.0 Trade receivables, prepaid expenses, and other current assets 15.7 Customer funds 18.9 Property, plant, and equipment and other assets 18.7 Goodwill 262.2 Other intangible assets 138.0 Accounts payable and other current liabilities (31.4 ) Customer funds obligations (18.8 ) Other non-current liabilities (48.8 ) Total purchase price $ 359.6

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	Our financial assets and liabilities measured at fair value on a recurring basis were categorized as follows: June 30, 2021 Level 1 Level 2 Level 3 Total (Dollars in millions) Assets Available for sale customer funds assets $ — $ 1,721.4 (a) $ — $ 1,721.4 Total assets measured at fair value $ — $ 1,721.4 $ — $ 1,721.4 December 31, 2020 Level 1 Level 2 Level 3 Total (Dollars in millions) Assets Available for sale customer funds assets $ — $ 1,719.1 (a) $ — $ 1,719.1 Total assets measured at fair value $ — $ 1,719.1 $ — $ 1,719.1 (a) Fair value is based on inputs that are observable for the asset or liability, other than quoted prices.

Customer Funds (Tables)

Customer Funds (Tables)	6 Months Ended
	Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Values of Investments of Customer Funds Available for Sale	June 30, 2021 Amortized Gross Unrealized Fair Cost Gain Loss Value (Dollars in millions) Money market securities, investments carried at cost and other cash equivalents $ 1,479.0 $ — $ — $ 1,482.4 Available for sale investments: U.S. government and agency securities 558.4 15.5 (1.8 ) 572.1 Canadian and provincial government securities 407.5 10.4 (0.1 ) 417.8 Corporate debt securities 454.1 13.6 (0.5 ) 467.2 Asset-backed securities 184.6 3.1 — 187.7 Mortgage-backed securities 5.1 0.1 — 5.2 Other short-term investments 7.0 — — 7.0 Other securities 64.6 0.1 (0.3 ) 64.4 Total available for sale investments 1,681.3 42.8 (2.7 ) 1,721.4 Invested customer funds 3,160.3 $ 42.8 $ (2.7 ) 3,203.8 Receivables 11.6 11.6 Total customer funds $ 3,171.9 $ 3,215.4 December 31, 2020 Amortized Gross Unrealized Fair Cost Gain Loss Value (Dollars in millions) Money market securities, investments carried at cost and other cash equivalents $ 2,027.1 $ — $ — $ 2,027.1 Available for sale investments: U.S. government and agency securities 494.0 21.6 (0.1 ) 515.5 Canadian and provincial government securities 396.4 15.5 — 411.9 Corporate debt securities 548.5 19.4 — 567.9 Asset-backed securities 192.2 4.9 — 197.1 Mortgage-backed securities 9.9 0.2 — 10.1 Other securities 16.5 0.1 — 16.6 Total available for sale investments 1,657.5 61.7 (0.1 ) 1,719.1 Invested customer funds 3,684.6 $ 61.7 $ (0.1 ) 3,746.2 Receivables 13.2 13.2 Total customer funds $ 3,697.8 $ 3,759.4
Schedule of Unrealized Losses and Fair Value	The following represents the gross unrealized losses and the related fair value of the investments of customer funds available for sale, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position. June 30, 2021 Less than 12 months 12 months or more Total Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value (Dollars in millions) U.S. government and agency securities $ (1.8 ) $ 172.0 $ — $ — $ (1.8 ) $ 172.0 Canadian and provincial government securities (0.1 ) 19.0 — — (0.1 ) 19.0 Corporate debt securities (0.5 ) 68.4 — — (0.5 ) 68.4 Asset-backed securities — 16.5 — — — 16.5 Other securities (0.3 ) 43.0 — — (0.3 ) 43.0 Total available for sale investments $ (2.7 ) $ 318.9 $ — $ — $ (2.7 ) $ 318.9
Schedule of Amortized Cost and Fair Value of Investment Securities Available for Sale by Contractual Maturity	The amortized cost and fair value of investment securities available for sale at June 30, 2021, by contractual maturity are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or to prepay obligations with or without call or prepayment penalties. June 30, 2021 Cost Fair Value (Dollars in millions) Due in one year or less $ 1,923.5 $ 1,931.6 Due in one to three years 688.6 712.4 Due in three to five years 402.8 407.5 Due after five years 145.4 152.3 Invested customer funds $ 3,160.3 $ 3,203.8

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Changes in Goodwill	Goodwill and changes therein were as follows: (Dollars in millions) Balance at December 31, 2019 $ 1,973.5 Acquisition 42.7 Translation 15.6 Balance at December 31, 2020 2,031.8 Acquisitions 288.9 Translation 8.8 Balance at June 30, 2021 $ 2,329.5
Schedule of Other Intangible Assets	Other intangible assets consisted of the following: June 30, 2021 Gross Carrying Amount Accumulated Amortization Net Estimated Life Range (Years) (Dollars in millions) Customer lists and relationships $ 306.9 $ (217.4 ) $ 89.5 4-15 Trade name 184.5 (2.9 ) 181.6 3-5 and Indefinite Technology 233.6 (163.5 ) 70.1 3-5 Total other intangible assets $ 725.0 $ (383.8 ) $ 341.2 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Estimated Life Range (Years) (Dollars in millions) Customer lists and relationships $ 229.0 $ (212.1 ) $ 16.9 5-15 Trade name 177.7 (2.5 ) 175.2 3-5 and Indefinite Technology 159.5 (156.6 ) 2.9 3-4 Total other intangible assets $ 566.2 $ (371.2 ) $ 195.0

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Debt Obligations	Our debt obligations consisted of the following as of the periods presented: June 30, December 31, 2021 2020 (Dollars in millions) Term Debt, interest rate of 2.6% $ 661.3 $ 664.7 Revolving Credit Facility ($300.0 million available capacity less amounts reserved for letters of credit, which were $0.4 million and $0.4 million, respectively) — — Convertible Senior Notes, interest rate of 0.25% 575.0 — Australia Line of Credit (AUD $4.2 million letter of credit capacity, which was fully utilized; USD $3.1 million and USD $0 million, respectively) — — Canada Line of Credit (CAD $7.0 million letter of credit capacity, which was fully utilized; USD $5.6million and USD $5.4 million, respectively) — — Financing lease liabilities (Please refer to Note 13) 10.2 8.8 Total debt 1,246.5 673.5 Less unamortized discount on Term Debt and Convertible Senior Notes 104.7 1.2 Less unamortized debt issuance costs on Term Debt and Convertible Senior Notes 15.0 4.5 Less current portion of long-term debt 8.3 7.2 Long-term debt, less current portion $ 1,118.5 $ 660.6
Schedule of Convertible Senior Notes	The following table presents details of the Notes: Initial Conversion Rate per $1,000 Principal Initial Conversion Price per Share Notes 7.5641 shares $132.20
Summary of Interest Expense Recognized Related to Notes	The following table sets forth total interest expense recognized related to the Notes for the period: Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 (Dollars in millions) Contractual interest expense $ 0.4 $ 0.5 Amortization of debt discount 4.4 5.1 Amortization of debt issuance costs 0.5 0.6 Total $ 5.3 $ 6.2
Schedule of Future Principal Payments and Maturities of Indebtedness, Excluding Financing Lease Obligations	The future principal payments and maturities of our indebtedness, excluding financing lease obligations, are as follows: Years Ending December 31, Amount (Dollars in millions) Remainder of 2021 $ 3.4 2022 6.8 2023 6.8 2024 6.8 2025 637.5 Thereafter 575.0 $ 1,236.3

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2021
Compensation And Retirement Disclosure [Abstract]
Components of Net Periodic Cost for Defined Benefit Pension Plan and for Postretirement Benefit Plan	The components of net periodic cost for our defined benefit pension plan and for our postretirement benefit plan are included in the following tables: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net Periodic Pension Cost (Dollars in millions) Interest cost $ 1.7 $ 3.2 $ 3.4 $ 6.4 Actuarial loss amortization 4.3 3.9 8.6 7.8 Less: Expected return on plan assets (3.3 ) (5.7 ) (6.6 ) (11.4 ) Net periodic pension cost $ 2.7 $ 1.4 $ 5.4 $ 2.8 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net Periodic Postretirement Benefit (Dollars in millions) Interest cost $ 0.1 $ 0.2 $ 0.1 $ 0.3 Actuarial gain amortization (0.5 ) (0.6 ) (1.0 ) (1.2 ) Prior service credit amortization (0.1 ) (0.1 ) (0.1 ) (0.2 ) Net periodic postretirement benefit gain $ (0.5 ) $ (0.5 ) $ (1.0 ) $ (1.1 )

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Performance-Based Stock Option Activity	Performance-based stock option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP was as follows: Shares Weighted Average Exercise Price (per share) Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in millions) Performance-based options outstanding at December 31, 2020 1,844,279 $ 64.55 9.2 $ 77.5 Granted — — — — Exercised (3,850 ) (13.46 ) — — Forfeited or expired (1,347 ) — — — Performance-based options outstanding at June 30, 2021 1,839,082 $ 64.65 8.8 $ 57.5 Performance-based options exercisable at June 30, 2021 21,701 $ 13.83 1.1 $ 1.8
Summary of Term-Based Stock Option Activity	Term-based stock option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP was as follows: Shares Weighted Average Exercise Price (per share) Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in millions) Term-based options outstanding at December 31, 2020 10,983,074 $ 40.47 7.8 $ 725.9 Granted 755,688 83.99 — — Exercised (929,544 ) (22.17 ) — — Forfeited or expired (122,079 ) (49.20 ) — — Term-based options outstanding at June 30, 2021 10,687,139 $ 44.26 7.5 $ 552.1 Term-based options exercisable at June 30, 2021 5,058,708 $ 34.14 6.9 $ 312.5
Summary of Restricted Stock Units Activity	RSU activity under the 2013 SIP and the 2018 EIP was as follows: Shares RSUs outstanding at December 31, 2020 1,389,385 Granted 793,698 Shares issued upon vesting of RSUs (168,117 ) Forfeited or canceled (25,914 ) RSUs outstanding at June 30, 2021 1,989,052 RSUs releasable at June 30, 2021 570,021
Summary of Performance Stock Units	PSU activity under the 2018 EIP was as follows: Shares PSUs outstanding at December 31, 2020 135,220 Granted 343,233 Shares issued upon vesting of PSUs (1,148 ) Forfeited or canceled (140,692 ) PSUs outstanding at June 30, 2021 336,613 PSUs releasable at June 30, 2021 —
Summary of Global Employee Stock Purchase Plan Activity	Our GESPP activity was as follows: Period Ended Shares Issued Purchase Price (per share) March 31, 2021 39,484 $ 71.63 June 30, 2021 39,440 81.53

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue From Contract With Customer [Abstract]
Summary of Disaggregation of Revenue	Disaggregation of Revenue Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (Dollars in millions) Revenue: Cloud Dayforce Recurring $ 150.6 $ 118.5 $ 295.9 $ 246.6 Professional services and other 38.0 33.0 74.8 73.7 Total Dayforce revenue 188.6 151.5 370.7 320.3 Powerpay Recurring 20.5 16.2 40.8 38.0 Professional services and other 0.3 0.2 0.6 0.5 Total Powerpay revenue 20.8 16.4 41.4 38.5 Total Cloud revenue 209.4 167.9 412.1 358.8 Bureau Recurring 37.0 24.4 67.4 56.0 Professional services and other 4.0 0.3 5.4 0.5 Total Bureau revenue 41.0 24.7 72.8 56.5 Total revenue $ 250.4 $ 192.6 $ 484.9 $ 415.3
Schedule of Changes in Deferred Revenue	Deferred revenue primarily consists of payments received in advance of revenue recognition. The changes in deferred revenue were as follows: Six Months Ended June 30, 2021 2020 (Dollars in millions) Deferred revenue, beginning of period $ 24.4 $ 25.5 New billings 244.0 196.1 Acquired billings 17.0 — Revenue recognized (241.7 ) (197.2 ) Effect of exchange rate (0.5 ) (0.4 ) Deferred revenue, end of period $ 43.2 $ 24.0

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive loss were as follows: Foreign Currency Translation Adjustment Unrealized Gain (Loss) from Invested Customer Funds Pension Liability Adjustment Total (Dollars in millions) Balance as of December 31, 2020 $ (159.7 ) $ 38.4 $ (154.7 ) $ (276.0 ) Other comprehensive income (loss) before income taxes and reclassifications 24.0 (22.1 ) 0.1 2.0 Income tax benefit (expense) — 5.8 (2.0 ) 3.8 Reclassifications to earnings — — 7.5 7.5 Other comprehensive (loss) income 24.0 (16.3 ) 5.6 13.3 Balance as of June 30, 2021 $ (135.7 ) $ 22.1 $ (149.1 ) $ (262.7 )

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: Lease Type Balance Sheet Classification June 30, 2021 December 31, 2020 (Dollars in millions) ASSETS Operating lease assets Trade and other receivables, net $ — $ 5.4 Operating lease assets Prepaid expenses and other current assets 2.7 2.2 Operating lease assets Right of use lease asset 33.6 27.9 Financing lease assets Property, plant, and equipment, net 8.9 8.0 Total lease assets $ 45.2 $ 43.5 LIABILITIES Current Financing lease liabilities Current portion of long-term debt $ 1.5 $ 0.4 Operating lease liabilities Current portion of long-term lease liabilities 10.0 10.5 Noncurrent Financing lease liabilities Long-term debt, less current portion 8.7 8.4 Operating lease liabilities Long-term lease liabilities, less current portion 41.4 33.6 Total lease liabilities $ 61.6 $ 52.9
Components of Lease Expense	The components of lease expense were as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Lease Cost (Dollars in millions) Operating lease cost $ 1.4 $ 2.3 $ 2.6 $ 4.6 Financing lease cost: Depreciation of lease assets 0.3 0.2 0.7 0.4 Interest on lease liabilities 0.1 0.1 0.1 0.2 Sublease income (0.7 ) (1.1 ) (1.3 ) (2.1 ) Total lease cost, net $ 1.1 $ 1.5 $ 2.1 $ 3.1

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2021
Related Party Transactions [Abstract]
Schedule of Revenue from Portfolio Companies	We provide Dayforce and related services to certain companies that are considered related parties. The revenue from these related parties was as follows: Three Months Ended June 30, Six Months Ended June 30, Counter-Party Related Persons Interest 2021 2020 2021 2020 (Dollars in millions) FleetCor Technologies, Inc. Shared board members. One board member is also the chief executive officer and the chairman of the counter-party's board $ 0.2 $ 0.2 $ 0.3 $ 0.5 The Stronach Group The brother of our chief executive officer ("CEO") was formerly the chief executive officer, and is currently a minority shareholder — 0.1 0.1 0.1 Verve Senior Living Our CEO and the brother of our CEO are currently minority shareholders 0.1 — 0.2 — Fidelity National Financial, Inc. Shared board members 0.2 0.1 0.2 0.1 Essex Technology Group, LLC Portfolio company of Thomas H. Lee Partners, L.P. ("THL"), of which certain members of our board are managing directors 0.1 0.2 0.3 0.3 Guaranteed Rate, Inc. Portfolio company of THL, of which certain members of our board are managing directors 0.4 0.1 0.9 0.3 HighTower Advisors, LLC Portfolio company of THL, of which certain members of our board are managing directors. One board member also serves on the board of the counter-party 0.1 — 0.1 — Ten-X, LLC Portfolio company of THL, of which certain members of our board are managing directors — 0.1 0.1 0.1 Philips Feed Services Portfolio company of THL, of which certain members of our board are managing directors 0.1 0.1 0.1 0.1 The Dun and Bradstreet Corporation Shared board members with Dun & Bradstreet Holdings, Inc., which owns the counter-party * — * —
Schedule of Payments to Portfolio Companies	We are party to service agreements with certain companies that are considered related parties. Payments made to the related parties were as follows: Three Months Ended June 30, Six Months Ended June 30, Counter-Party Related Persons Interest 2021 2020 2021 2020 (Dollars in millions) The Dun and Bradstreet Corporation Shared board members with Dun & Bradstreet Holdings, Inc., which owns the counter-party $ 0.1 $ 0.4 $ 0.4 $ 0.4 Manulife Financial Shared board members. Our President and Chief Operating Officer also serves as a director $ 2.1 $ 1.9 $ 4.1 $ 3.8

Net Income (Loss) per Share (Ta

Net Income (Loss) per Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Computations of Basic and Diluted Net Income (Loss) per Share	The basic and diluted net income (loss) per share computations were calculated as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (Dollars in millions, except share and per share data) Numerator: Net (loss) income $ (25.8 ) $ 5.5 $ (45.0 ) $ 14.1 Denominator: Weighted-average shares outstanding - basic 149,293,833 145,593,019 149,006,538 145,119,172 Effect of dilutive equity instruments — 5,851,882 — 6,201,921 Weighted-average shares outstanding - diluted 149,293,833 151,444,901 149,006,538 151,321,093 Net (loss) income per share - basic $ (0.17 ) $ 0.04 $ (0.30 ) $ 0.10 Net (loss) income per share - diluted $ (0.17 ) $ 0.04 $ (0.30 ) $ 0.09
Schedule of Potentially Dilutive Weighted Average Shares Excluded from Calculation of Diluted Net Income (Loss) per Share	The following potentially dilutive weighted-average shares were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Stock options 5,542,424 2,511,973 5,496,018 1,316,676 Restricted stock units 458,018 60,460 500,064 41,119 Performance stock units 729,104 — 667,903 —

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	Mar. 16, 2021	Mar. 05, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Amortization expense for the deferred costs				$ 11.3	$ 9.1	$ 22.3	$ 18.1
ASU 2019-12 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date				Jan. 31, 2021		Jan. 31, 2021
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]				true		true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]				true		true
Other Assets [Member]
Significant Accounting Policies [Line Items]
Deferred costs				$ 131.8		$ 131.8		$ 132.9
Convertible Senior Notes [Member]
Significant Accounting Policies [Line Items]
Debt instrument principal amount	$ 575	$ 500	$ 575
Debt instrument percentage of aggregate principal amount	0.25%	0.25%	0.25%
Debt instrument maturity year	2026	2026
Debt instrument additional aggregate principal amount	$ 75		$ 75
Net proceeds from deducting initial purchase discounts and other debt issuance costs		$ 561.8	$ 561.8

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ in Millions	Apr. 30, 2021USD ($)	Mar. 01, 2021USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)Segment	Jun. 30, 2020USD ($)
Business Acquisition [Line Items]
Total revenue			$ 250.4	$ 192.6	$ 484.9	$ 415.3
Number of operating segment | Segment					1
Number of reportable segment | Segment					1
Ideal [Member]
Business Acquisition [Line Items]
Percentage of voting interest	100.00%
Purchase price	$ 41.3
Total revenue			0.7
Ascender HCM Pty Ltd. [Member]
Business Acquisition [Line Items]
Percentage of voting interest		100.00%
Purchase price		$ 359.6
Total revenue			$ 22.9		$ 29.6
Ascender HCM Pty Ltd. [Member] | Other Expense, Net [Member]
Business Acquisition [Line Items]
Gain on forward foreign currency contract		$ 4.2

Business Combinations - Schedul

Business Combinations - Schedule of Major Classes of Assets and Liabilities Preliminarily Allocated to Purchase Price (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Apr. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 2,329.5		$ 2,031.8	$ 1,973.5
Ideal [Member]
Business Acquisition [Line Items]
Cash and equivalents		$ 2.6
Trade receivables, prepaid expenses, and other current assets		0.5
Property, plant, and equipment and other assets		0.1
Goodwill		26.7
Other intangible assets		18.3
Accounts payable and other current liabilities		(3.6)
Other non-current liabilities		(3.3)
Total purchase price		$ 41.3
Ascender HCM Pty Ltd. [Member]
Business Acquisition [Line Items]
Cash and equivalents	3.1
Restricted cash	2
Trade receivables, prepaid expenses, and other current assets	15.7
Customer funds	18.9
Property, plant, and equipment and other assets	18.7
Goodwill	262.2
Other intangible assets	138
Accounts payable and other current liabilities	(31.4)
Customer funds obligations	(18.8)
Other non-current liabilities	(48.8)
Total purchase price	$ 359.6

Fair Value Measurements - Asset

Fair Value Measurements - Asset and Liability Measured at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Assets
Available for sale customer funds assets		$ 1,721.4	$ 1,719.1
Total assets measured at fair value		1,721.4	1,719.1
Fair Value, Inputs, Level 2 [Member]
Assets
Available for sale customer funds assets	[1]	1,721.4	1,719.1
Total assets measured at fair value		$ 1,721.4	$ 1,719.1
[1]	Fair value is based on inputs that are observable for the asset or liability, other than quoted prices.

Customer Funds - Additional Inf

Customer Funds - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Investment income from invested customer funds included in recurring revenue	$ 10.4	$ 11.5	$ 21.1	$ 31.1

Customer Funds - Investment of

Customer Funds - Investment of Customer Funds (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Money market securities, investments carried at cost and other cash equivalents, Fair Value	$ 1,482.4	$ 2,027.1
Invested customer funds, Fair Value	3,203.8	3,746.2
Receivables, Fair Value	11.6	13.2
Total customer funds, Fair Value	3,215.4	3,759.4
Money market securities, investments carried at cost and other cash equivalents, Amortized Cost	1,479	2,027.1
Invested customer funds, Amortized Cost	3,160.3	3,684.6
Receivables, Amortized Cost	11.6	13.2
Total customer funds, Amortized Cost	3,171.9	3,697.8
Amortized Cost	1,681.3	1,657.5
Gross Unrealized Gain	42.8	61.7
Gross Unrealized Loss	(2.7)	(0.1)
Fair value	1,721.4	1,719.1
U.S. Government and Agencies Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	558.4	494
Gross Unrealized Gain	15.5	21.6
Gross Unrealized Loss	(1.8)	(0.1)
Fair value	572.1	515.5
Canadian and Provincial Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	407.5	396.4
Gross Unrealized Gain	10.4	15.5
Gross Unrealized Loss	(0.1)
Fair value	417.8	411.9
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	454.1	548.5
Gross Unrealized Gain	13.6	19.4
Gross Unrealized Loss	(0.5)
Fair value	467.2	567.9
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	184.6	192.2
Gross Unrealized Gain	3.1	4.9
Fair value	187.7	197.1
Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5.1	9.9
Gross Unrealized Gain	0.1	0.2
Fair value	5.2	10.1
Other Short-Term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7
Fair value	7
Other Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	64.6	16.5
Gross Unrealized Gain	0.1	0.1
Gross Unrealized Loss	(0.3)
Fair value	$ 64.4	$ 16.6

Customer Funds - Gross Unrealiz

Customer Funds - Gross Unrealized Losses and Related Fair Value of Investment (Detail) $ in Millions	Jun. 30, 2021USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Losses	$ (2.7)
Less than 12 months, Fair Value	318.9
Total, Unrealized Losses	(2.7)
Total, Fair Value	318.9
U.S. Government and Agencies Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Losses	(1.8)
Less than 12 months, Fair Value	172
Total, Unrealized Losses	(1.8)
Total, Fair Value	172
Canadian and Provincial Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Losses	(0.1)
Less than 12 months, Fair Value	19
Total, Unrealized Losses	(0.1)
Total, Fair Value	19
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Losses	(0.5)
Less than 12 months, Fair Value	68.4
Total, Unrealized Losses	(0.5)
Total, Fair Value	68.4
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	16.5
Total, Fair Value	16.5
Other Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Losses	(0.3)
Less than 12 months, Fair Value	43
Total, Unrealized Losses	(0.3)
Total, Fair Value	$ 43

Customer Funds - Amortized Cost

Customer Funds - Amortized Cost and Fair Value of Investment Security Available for Sale (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Cost	$ 1,923.5
Due in one to three years, Cost	688.6
Due in three to five years, Cost	402.8
Due after five years, Cost	145.4
Invested customer funds, Cost	3,160.3	$ 3,684.6
Due in one year or less, Fair Value	1,931.6
Due in one to three years, Fair Value	712.4
Due in three to five years, Fair Value	407.5
Due after five years, Fair Value	152.3
Invested customer funds, Fair Value	$ 3,203.8	$ 3,746.2

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Balance	$ 2,031.8	$ 1,973.5
Acquisition	288.9	42.7
Translation	8.8	15.6
Balance	$ 2,329.5	$ 2,031.8

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Other Intangible Asset (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 725	$ 566.2
Accumulated Amortization	(383.8)	(371.2)
Net	341.2	195
Trade Name [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	184.5	177.7
Accumulated Amortization	(2.9)	(2.5)
Net	$ 181.6	$ 175.2
Minimum [Member] | Trade Name [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	3 years	3 years
Maximum [Member] | Trade Name [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	5 years	5 years
Estimated Life Range (Years)	Indefinite	Indefinite
Customer Lists and Relationships [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 306.9	$ 229
Accumulated Amortization	(217.4)	(212.1)
Net	$ 89.5	$ 16.9
Customer Lists and Relationships [Member] | Minimum [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	4 years	5 years
Customer Lists and Relationships [Member] | Maximum [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	15 years	15 years
Technology [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 233.6	$ 159.5
Accumulated Amortization	(163.5)	(156.6)
Net	$ 70.1	$ 2.9
Technology [Member] | Minimum [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	3 years	3 years
Technology [Member] | Maximum [Member]
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Estimated Life Range (Years)	5 years	4 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 9.8	$ 0.4	$ 12	$ 0.7

Debt - Schedule of Debt Obligat

Debt - Schedule of Debt Obligations (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt excluding financing lease liabilities	$ 1,236.3
Financing lease liabilities (Please refer to Note 13)	10.2	$ 8.8
Total debt	1,246.5	673.5
Less current portion of long-term debt	8.3	7.2
Long-term debt, less current portion	1,118.5	660.6
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Total debt excluding financing lease liabilities	575
Term Debt and Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Less unamortized discount on Term Debt and Convertible Senior Notes	104.7	1.2
Less unamortized debt issuance costs on Term Debt and Convertible Senior Notes	15	4.5
Term Debt [Member]
Debt Instrument [Line Items]
Total debt excluding financing lease liabilities	$ 661.3	$ 664.7

Debt - Schedule of Debt Oblig_2

Debt - Schedule of Debt Obligations (Parenthetical) (Detail) $ in Millions, $ in Millions, $ in Millions	Jun. 30, 2021USD ($)	Jun. 30, 2021CAD ($)	Jun. 30, 2021AUD ($)	Mar. 31, 2021	Dec. 31, 2020USD ($)	Dec. 31, 2020CAD ($)	Dec. 31, 2020AUD ($)	Apr. 30, 2018USD ($)
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on debt	0.25%	0.25%	0.25%	0.25%	0.25%	0.25%	0.25%
Term Debt [Member]
Debt Instrument [Line Items]
Interest rate on debt	2.60%	2.60%	2.60%		2.60%	2.60%	2.60%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available capacity	$ 300				$ 300			$ 300
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Available capacity	0.4				0.4
Foreign Line of Credit [Member] | Australia [Member]
Debt Instrument [Line Items]
Available capacity	3.1				0
Foreign Line of Credit [Member] | Australia [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Available capacity			$ 4.2				$ 4.2
Foreign Line of Credit [Member] | Canada [Member]
Debt Instrument [Line Items]
Available capacity	$ 5.6				$ 5.4
Foreign Line of Credit [Member] | Canada [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Available capacity		$ 7				$ 7

Debt - Additional Information (

Debt - Additional Information (Detail)	Mar. 20, 2024Day	Mar. 16, 2021USD ($)	Mar. 05, 2021USD ($)	Feb. 19, 2020	Mar. 26, 2019	Mar. 31, 2021USD ($)$ / shares	Sep. 30, 2021Day	Jun. 30, 2021USD ($)Day	Dec. 31, 2020USD ($)	Apr. 30, 2018USD ($)
Debt Instrument [Line Items]
Accrued interest and fees								$ 500,000	$ 100,000
Fair value of our indebtedness								1,232,800,000	$ 657,600,000
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Trading price per principal amount of notes								1,000
Debt instrument fair value of trading price								$ 1,000
Capped Calls [Member]
Debt Instrument [Line Items]
Derivative, initial strike price | $ / shares						132.20
Derivative, initial cap price | $ / shares						179.26
Derivative, premium paid						$ 45,000,000
Reduction to additional paid-in capital						(33,000,000)
Net of deferred tax impact						12,000,000
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument principal amount		$ 575,000,000	$ 500,000,000			$ 575,000,000
Term loan debt maturity period								Mar. 15, 2026
Debt instrument percentage of aggregate principal amount		0.25%	0.25%			0.25%
Debt instrument additional aggregate principal amount		$ 75,000,000				$ 75,000,000
Debt instrument bear interest rate						0.25%		0.25%	0.25%
Net proceeds from deducting initial purchase discounts and other debt issuance costs			$ 561,800,000			$ 561,800,000
Debt instrument frequency of periodic payment								semiannuall
Debt instrument payment terms								The Notes bear interest at a rate of 0.25% per year and interest is payable semiannually in arrears on March 15 and September 15 of each year, beginning on September 15, 2021.
Debt instrument payment beginning date								Sep. 15, 2021
Debt instrument common stock exceeds conversion price percentage								98.00%
Number of conversion price, consecutive trading days | Day								10
Number of conversion price, consecutive business days | Day								5
Trading price per principal amount of notes								$ 1,000
Debt instrument, interest rate during period								4.50%
Debt instrument, convertible, carrying amount of equity component								$ 108,600,000
Total issuance costs								$ 14,400,000
Senior note, amortized interest rate								5.10%
Debt instrument fair value of trading price								$ 1,000
Convertible Senior Notes [Member] | Liability Component [Member]
Debt Instrument [Line Items]
Total issuance costs								11,700,000
Convertible Senior Notes [Member] | Equity Component
Debt Instrument [Line Items]
Total issuance costs								2,700,000
Net carrying amount								77,700,000
Deferred tax impact								28,200,000
Convertible Senior Notes [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Number of conversion price trading days | Day	20						20
Number of conversion price, consecutive trading days | Day	30						30
Convertible Senior Notes [Member] | Maximum [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Debt instrument common stock exceeds conversion price percentage	130.00%						130.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available capacity for letters of credit								$ 300,000,000	$ 300,000,000	$ 300,000,000
Line of credit maturity date								Apr. 30, 2023
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate description								Term Debt interest rate was reduced from LIBOR plus 3.00% to LIBOR plus 2.50%.
Senior Secured Credit Facility [Member] | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable interest rate				2.50%	3.00%
Term Debt [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 680,000,000
Term loan debt maturity period								Apr. 30, 2025
Debt instrument bear interest rate								2.60%	2.60%

Debt - Schedule of Convertible

Debt - Schedule of Convertible Senior Notes (Detail) - Convertible Senior Notes [Member]	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Debt Instrument [Line Items]
Initial Conversion Rate per $1,000 Principal | shares	7.5641
Initial Conversion Price per Share | $ / shares	$ 132.20

Debt - Schedule of Convertibl_2

Debt - Schedule of Convertible Senior Notes (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2021USD ($)
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Initial conversion per principal amount	$ 1,000

Debt - Summary of Interest Expe

Debt - Summary of Interest Expense Recognized Related to Notes (Detail) - Convertible Senior Notes [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Debt Instrument [Line Items]
Contractual interest expense	$ 0.4	$ 0.5
Amortization of debt discount	4.4	5.1
Amortization of debt issuance costs	0.5	0.6
Total	$ 5.3	$ 6.2

Debt - Schedule of Future Princ

Debt - Schedule of Future Principal Payments and Maturities of Indebtedness, Excluding Financing Lease Obligations (Detail) $ in Millions	Jun. 30, 2021USD ($)
Debt Disclosure [Abstract]
Remainder of 2021	$ 3.4
2022	6.8
2023	6.8
2024	6.8
2025	637.5
Thereafter	575
Principal payments and maturities excluding financing lease obligations	$ 1,236.3

Employee Benefit Plans - Compon

Employee Benefit Plans - Components of Net Periodic Cost for Defined Benefit Pension Plan and for Postretirement Benefit Plan (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic cost (benefit gain)			$ 4.4	$ 1.7
Defined Benefit Pension Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 1.7	$ 3.2	3.4	6.4
Actuarial loss (gain) amortization	4.3	3.9	8.6	7.8
Less: Expected return on plan assets	(3.3)	(5.7)	(6.6)	(11.4)
Net periodic cost (benefit gain)	2.7	1.4	5.4	2.8
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	0.1	0.2	0.1	0.3
Actuarial loss (gain) amortization	(0.5)	(0.6)	(1)	(1.2)
Prior service credit amortization	(0.1)	(0.1)	(0.1)	(0.2)
Net periodic cost (benefit gain)	$ (0.5)	$ (0.5)	$ (1)	$ (1.1)

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Detail) - USD ($)	Nov. 09, 2018	Apr. 24, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 31,400,000	$ 15,300,000	$ 54,200,000	$ 27,800,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense related to unvested stock option awards not yet recognized			18,300,000		$ 18,300,000
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period					2 years 9 months 18 days
Term Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense related to unvested stock option awards not yet recognized			$ 88,800,000		$ 88,800,000
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period					1 year 7 months 6 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period					1 year 7 months 6 days
Stock options, vested					573,029
Unvested restricted stock units outstanding			1,419,031		1,419,031
Vested restricted stock units outstanding			570,021		570,021
Share-based compensation expense related to unvested restricted stock units not yet recognized			$ 89,900,000		$ 89,900,000
HCM Stock Incentive Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares outstanding			1,936		1,936
HCM Stock Incentive Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares outstanding			1,956,504		1,956,504
Share based compensation arrangement by share based payment award exercise period after employment termination					90 days
Stock option awards, contractual term					10 years
HCM Stock Incentive Plan 2013 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period					4 years
HCM Stock Incentive Plan 2013 [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period					5 years
HCM Equity Incentive Plan 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares outstanding			12,893,446		12,893,446
Share based compensation arrangement by share based payment award exercise period after employment termination		90 days
Stock option awards, contractual term		10 years
Number of shares authorized		13,500,000
Common stock, share Reserve								4,397,296
Shares reserved for issuance increase percentage		3.00%
Shares available for future grants of equity awards			13,399,132		13,399,132
HCM Equity Incentive Plan 2018 [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period							3 years
Options, Granted							1,500,000
Exercise price per share							$ 65.26
Vesting conditions description					The vesting conditions for the Performance Option Award are based on the Company’s performance on the New York Stock Exchange (“NYSE”) with 750,000 shares available to vest when the Company’s per share closing price on the NYSE meets or exceeds $110.94, or 1.7 times the exercise price, for ten consecutive trading days, and the remaining 750,000 shares are available to vest when the Company’s per share closing price on the NYSE meets or exceeds $130.52, or 2.0 times the exercise price, for ten consecutive trading days.
HCM Equity Incentive Plan 2018 [Member] | Performance Shares [Member] | Monte-Carlo Simulation Model [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period							5 years 3 months 18 days
HCM Equity Incentive Plan 2018 [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		4 years
HCM Equity Incentive Plan 2018 [Member] | Closing Price Per Share Exceeds $110.94 or 1.7 Times the Exercise Price [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available to vest							750,000
Closing price per share on NYSE to available for vest							$ 110.94
HCM Equity Incentive Plan 2018 [Member] | Closing Price Per Share Exceeds $130.52 or 2.0 Times the Exercise Price [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available to vest							750,000
Closing price per share on NYSE to available for vest							$ 130.52
HCM Equity Incentive Plan 2018 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		1 year
HCM Equity Incentive Plan 2018 [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period		3 years
2021 Management Incentive Plan [Member] | Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum incentive vesting of PSUs					150.00%
Share-based compensation expense related to unvested PSUs not yet recognized			$ 22,300,000		$ 22,300,000
HCM Global Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards, contractual term	10 years
Shares available for future grants of equity awards			1,976,113		1,976,113
Description for purchase price of fair market value of common stock					The purchase price is the lower of (i) 85% of the fair market value of a share of common stock on the offering date (the first trading day of the offering period commencing on January 1 and concluding on December 31) or (ii) 85% of the fair market value of a share of common stock on the purchase date.
Percentage of fair market value of a share of common stock on offering date	85.00%
Percentage of fair market value of share of common stock on purchase date	85.00%
HCM Global Employee Stock Purchase Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	2,500,000

Share-Based Compensation - Summ

Share-Based Compensation - Summary of Performance-Based Stock Option Activity (Detail) - Performance Shares [Member] - Share Based Compensation Plans [Member] - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Shares
Options Outstanding at Beginning of Period	1,844,279
Options, Granted	0
Options, Exercised	(3,850)
Options, Forfeited or expired	(1,347)
Options Outstanding at End of Period	1,839,082	1,844,279
Options Exercisable at End of Period	21,701
Weighted Average Exercise Price (per share)
Weighted Average Exercise Price at Beginning of Period	$ 64.55
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	(13.46)
Weighted Average Exercise Price, Forfeited or expired	0
Weighted Average Exercise Price at End of Period	64.65	$ 64.55
Weighted Average Exercise Price Exercisable at End of Period	$ 13.83
Weighted Average Remaining Contractual Term (in years)
Weighted Average Remaining Contractual Term (in years)	8 years 9 months 18 days	9 years 2 months 12 days
Weighted Average Remaining Contractual Term Exercisable (in years)	1 year 1 month 6 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Options Outstanding	$ 57.5	$ 77.5
Aggregate Intrinsic Value, Options Exercisable	$ 1.8

Share-Based Compensation - Su_2

Share-Based Compensation - Summary of Term-Based Stock Option Activity (Detail) - Term Based Stock Options [Member] - Share Based Compensation Plans [Member] - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Shares
Options Outstanding at Beginning of Period	10,983,074
Options, Granted	755,688
Options, Exercised	(929,544)
Options, Forfeited or expired	(122,079)
Options Outstanding at End of Period	10,687,139	10,983,074
Options Exercisable at End of Period	5,058,708
Weighted Average Exercise Price (per share)
Weighted Average Exercise Price at Beginning of Period	$ 40.47
Weighted Average Exercise Price, Granted	83.99
Weighted Average Exercise Price, Exercised	(22.17)
Weighted Average Exercise Price, Forfeited or expired	(49.20)
Weighted Average Exercise Price at End of Period	44.26	$ 40.47
Weighted Average Exercise Price Exercisable at End of Period	$ 34.14
Weighted Average Remaining Contractual Term (in years)
Weighted Average Remaining Contractual Term (in years)	7 years 6 months	7 years 9 months 18 days
Weighted Average Remaining Contractual Term Exercisable (in years)	6 years 10 months 24 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Options Outstanding	$ 552.1	$ 725.9
Aggregate Intrinsic Value, Options Exercisable	$ 312.5

Share-Based Compensation - Su_3

Share-Based Compensation - Summary of Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) [Member]	6 Months Ended
	Jun. 30, 2021shares
Restricted Stock Units
Shares issued upon vesting	(573,029)
Shares, outstanding at End of Period	1,419,031
Share Based Compensation Plans [Member]
Restricted Stock Units
Shares, outstanding at Beginning of Period	1,389,385
Shares, Granted	793,698
Shares issued upon vesting	(168,117)
Shares, Forfeited or canceled	(25,914)
Shares, outstanding at End of Period	1,989,052
Shares, releasable at End of Period	570,021

Share-Based Compensation - Su_4

Share-Based Compensation - Summary of Performance Stock Units (Detail) - Performance Stock Units (PSUs) [Member] - Share Based Compensation Plans [Member]	6 Months Ended
	Jun. 30, 2021shares
Performance Stock Units
Shares, outstanding at Beginning of Period	135,220
Shares, Granted	343,233
Shares issued upon vesting	(1,148)
Shares, Forfeited or canceled	(140,692)
Shares, outstanding at End of Period	336,613
Shares, releasable at End of Period	0

Share-Based Compensation - Su_5

Share-Based Compensation - Summary of Global Employee Stock Purchase Plan Activity (Detail) - HCM Global Employee Stock Purchase Plan [Member] - Common Stock [Member] - $ / shares	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued	39,484	39,440
Purchase Price (per share)	$ 71.63	$ 81.53

Revenue - Summary of Disaggrega

Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 250.4	$ 192.6	$ 484.9	$ 415.3
Cloud Dayforce Professional Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	38	33	74.8	73.7
Cloud Dayforce Recurring [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	150.6	118.5	295.9	246.6
Cloud Dayforce Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	188.6	151.5	370.7	320.3
Cloud Powerpay Professional Services and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	0.3	0.2	0.6	0.5
Cloud Powerpay Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	20.8	16.4	41.4	38.5
Cloud Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	209.4	167.9	412.1	358.8
Cloud Powerpay Recurring [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	20.5	16.2	40.8	38
Bureau Professional Services and Other Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	4	0.3	5.4	0.5
Bureau Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	41	24.7	72.8	56.5
Bureau Recurring Revenue [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 37	$ 24.4	$ 67.4	$ 56

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue [Line Items]
Contract asset	$ 61.3		$ 61.3		$ 55.2
Remaining performance obligation, description of practical expedient			In accordance with the practical expedient provided in ASC Topic 606, performance obligations that are billed and recognized as they are delivered, primarily professional services contracts that are on a time and materials basis, are excluded from the transaction price for remaining performance obligations disclosed above.
Recurring [Member]
Revenue [Line Items]
Float revenue	$ 10.4	$ 11.5	$ 21.1	$ 31.1

Revenue - Schedule of Changes i

Revenue - Schedule of Changes in Deferred Revenue (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Revenue From Contract With Customer [Abstract]
Deferred revenue, beginning of period	$ 24.4	$ 25.5
New billings	244	196.1
Acquired billings	17
Revenue recognized	(241.7)	(197.2)
Effect of exchange rate	(0.5)	(0.4)
Deferred revenue, end of period	$ 43.2	$ 24

Revenue - Additional Informat_2

Revenue - Additional Information 1 (Detail) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01 $ in Millions	Jun. 30, 2021USD ($)
Revenue [Line Items]
Remaining performance obligations recognition period	3 years
Revenue expected to be recognized, amount	$ 1,027

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 2,098.2
Other comprehensive income (loss) before income taxes and reclassifications	2
Income tax benefit (expense)	3.8
Reclassifications to earnings	7.5
Other comprehensive (loss) income	13.3
Ending balance	2,199.8
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(159.7)
Other comprehensive income (loss) before income taxes and reclassifications	24
Other comprehensive (loss) income	24
Ending balance	(135.7)
Unrealized Gain (Loss) from Invested Customer Funds [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	38.4
Other comprehensive income (loss) before income taxes and reclassifications	(22.1)
Income tax benefit (expense)	5.8
Other comprehensive (loss) income	(16.3)
Ending balance	22.1
Pension Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(154.7)
Other comprehensive income (loss) before income taxes and reclassifications	0.1
Income tax benefit (expense)	(2)
Reclassifications to earnings	7.5
Other comprehensive (loss) income	5.6
Ending balance	(149.1)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(276)
Ending balance	$ (262.7)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Taxes [Line Items]
Income tax (benefit) expense	$ (12)	$ (8.4)	$ (5.4)	$ (0.2)
Current income tax benefit			10.6
Other tax expense			2.4
Tax reduction attributable to the release of tax reserves			1.9
International tax rate differential			2.4
Unrecognized tax benefits	0		0		$ 1.8
Accrued Interest included in unrecognized tax benefits					$ 0.3
Unrecognized tax benefits released during the period			$ 1.8
Income tax examination description			With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2016.
Non Deductible Stock Based Compensation
Income Taxes [Line Items]
Income tax (benefit) expense			$ 2.4
State [Member]
Income Taxes [Line Items]
Valuation allowance	$ 16.3		16.3
Income tax (benefit) expense			(3.5)
Base Erosion and Anti-Abuse Tax ("BEAT") [Member]
Income Taxes [Line Items]
Income tax (benefit) expense			5.3
Unremitted Foreign Earnings [Member]
Income Taxes [Line Items]
Income tax (benefit) expense			$ 1.9

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Operating Leased Assets [Line Items]
Right of use lease asset	$ 33.6	$ 27.9
Financing lease assets noncurrent	$ 8.9	$ 8
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant, and equipment, net	Property, plant, and equipment, net
Total lease assets	$ 45.2	$ 43.5
Finance lease liability current	$ 1.5	$ 0.4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent	us-gaap:LongTermDebtCurrent
Operating lease liability current	$ 10	$ 10.5
Finance lease liability Noncurrent	$ 8.7	$ 8.4
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent
Operating lease liability noncurrent	$ 41.4	$ 33.6
Total lease liabilities	61.6	52.9
Trade And Other Receivables Net
Operating Leased Assets [Line Items]
Operating lease assets current		5.4
Prepaid Expenses and Other Current Assets
Operating Leased Assets [Line Items]
Operating lease assets current	$ 2.7	$ 2.2

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease Cost
Operating lease cost	$ 1.4	$ 2.3	$ 2.6	$ 4.6
Financing lease cost:
Depreciation of lease assets	0.3	0.2	0.7	0.4
Interest on lease liabilities	0.1	0.1	0.1	0.2
Sublease income	(0.7)	(1.1)	(1.3)	(2.1)
Total lease cost, net	$ 1.1	$ 1.5	$ 2.1	$ 3.1

Related Party Transactions - Sc

Related Party Transactions - Schedule of Revenue from Portfolio Companies (Detail) - Dayforce [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
FleetCor Technologies, Inc. [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.2	$ 0.2	$ 0.3	$ 0.5
The Stronach Group [Member]
Related Party Transaction [Line Items]
Revenue from related parties		0.1	0.1	0.1
Verve Senior Living [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0.1		0.2
Fidelity National Financial, Inc. [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0.2	0.1	0.2	0.1
Essex Technology Group, LLC [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0.1	0.2	0.3	0.3
Guaranteed Rate, Inc. [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0.4	0.1	0.9	0.3
HighTower Advisors, LLC [Member]
Related Party Transaction [Line Items]
Revenue from related parties	0.1		0.1
Ten-X, LLC [Member]
Related Party Transaction [Line Items]
Revenue from related parties		0.1	0.1	0.1
Philips Feed Services, Inc [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.1	$ 0.1	$ 0.1	$ 0.1

Related Party Transactions - _2

Related Party Transactions - Schedule of Payments to Portfolio Companies (Detail) - Service Agreements [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Dun and Bradstreet [Member]
Related Party Transaction [Line Items]
Payment to service provider	$ 0.1	$ 0.4	$ 0.4	$ 0.4
Manulife Financial [Member]
Related Party Transaction [Line Items]
Payment to service provider	$ 2.1	$ 1.9	$ 4.1	$ 3.8

Net Income (Loss) per Share - S

Net Income (Loss) per Share - Schedule of Computations of Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net (loss) income	$ (25.8)	$ (19.2)	$ 5.5	$ 8.6	$ (45)	$ 14.1
Denominator:
Weighted-average shares outstanding - basic	149,293,833		145,593,019		149,006,538	145,119,172
Effect of dilutive equity instruments			5,851,882			6,201,921
Weighted-average shares outstanding - diluted	149,293,833		151,444,901		149,006,538	151,321,093
Net (loss) income per share - basic	$ (0.17)		$ 0.04		$ (0.30)	$ 0.10
Net (loss) income per share - diluted	$ (0.17)		$ 0.04		$ (0.30)	$ 0.09

Net Income (Loss) per Share -_2

Net Income (Loss) per Share - Schedule of Potentially Dilutive Weighted Average Shares Excluded from Calculation of Diluted Net Income (Loss) per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	5,542,424	2,511,973	5,496,018	1,316,676
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	458,018	60,460	500,064	41,119
Performance Stock Units (PSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	729,104		667,903

Net Income (Loss) per Share - A

Net Income (Loss) per Share - Additional Information (Detail) shares in Millions	6 Months Ended
	Jun. 30, 2021shares$ / shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Notes would have been convertible into shares of our common stock | shares	4.3
Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Initial conversion price of notes | $ / shares	$ 132.20