Automatic Data Processing (ADP) 10-Q 31 Jan 20 2020 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Dec. 31, 2019	Jan. 28, 2020
Document And Entity Information [Abstract]
Title of 12(b) Security	Common Stock, $0.10 Par Value(voting)
Document Transition Report	false
Document Quarterly Report	true
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-1467904
Entity Address, Address Line One	One ADP Boulevard
Entity Address, City or Town	Roseland,
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Entity File Number	1-5397
Entity Registrant Name	AUTOMATIC DATA PROCESSING, INC.
City Area Code	973
Local Phone Number	974-5000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Central Index Key	0000008670
Current Fiscal Year End Date	--06-30
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding		431,754,252
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07068
Trading Symbol	ADP
Security Exchange Name	NASDAQ
Entity Small Business	false
Entity Emerging Growth Company	false

Statements of Consolidated Earn

Statements of Consolidated Earnings - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
REVENUES:
Interest on funds held for clients		$ 137.7	$ 129.1	$ 271.5	$ 247.6
PEO revenues (A)	[1]	1,133.4	1,043.5	2,189	2,017.3
TOTAL REVENUES		3,669.5	3,492.4	7,165.2	6,802.7
Revenues, Net		2,398.4	2,319.8	4,704.7	4,537.8
Costs of revenues:
Operating expenses		1,836	1,772.4	3,623.6	3,469.5
Systems development and programming costs		168.7	156.1	336.9	314.1
Depreciation and amortization		89.4	71.7	178.3	144.3
TOTAL COSTS OF REVENUES		2,094.1	2,000.2	4,138.8	3,927.9
Selling, general, and administrative expenses		754.3	745.2	1,480.9	1,459
Interest expense		31.6	38.6	71.5	74.5
TOTAL EXPENSES		2,880	2,784	5,691.2	5,461.4
Other income, net		(46)	(32.6)	(100.6)	(46.5)
EARNINGS BEFORE INCOME TAXES		835.5	741	1,574.6	1,387.8
Provision for income taxes		183.9	182.8	340.6	324.2
NET EARNINGS		$ 651.6	$ 558.2	$ 1,234	$ 1,063.6
Basic earnings per share (in US$ per share)		$ 1.51	$ 1.28	$ 2.86	$ 2.44
Diluted earnings per share (in US$ per share)		$ 1.50	$ 1.27	$ 2.84	$ 2.42
Basic weighted average shares outstanding (shares)		431.5	435.7	432.1	436.2
Diluted weighted average shares outstanding (shares)		433.3	438	434.3	438.9
Direct pass-through costs PEO revenues		$ 12,371.6	$ 11,751.1	$ 22,882.2	$ 21,380.5
[1]	Professional Employer Organization (“PEO”) revenues are net of direct pass-through costs, primarily consisting of payroll wages and payroll taxes of $12,371.6 million and $11,751.1 million for the three months ended December 31, 2019 and 2018 , respectively, and $22,882.2 million and $21,380.5 million for the six months ended December 31, 2019 and 2018

Statements of Consolidated Ea_2

Statements of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Direct pass-through costs PEO revenues	$ 12,371.6	$ 11,751.1	$ 22,882.2	$ 21,380.5

Statements of Consolidated Comp

Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 651.6	$ 558.2	$ 1,234	$ 1,063.6
Other comprehensive income/(loss):
Currency translation adjustments	34.3	(24.7)	(14.6)	(47.6)
Unrealized net gains/(losses) on available-for-sale securities	(35.5)	168.3	60.6	118
Tax effect	7.5	(38.8)	(13.3)	(26.6)
Reclassification of net (gain)/losses on available-for-sale securities to net earnings	(7.1)	0.5	(9.4)	1.4
Tax effect	1.6	(0.1)	2.1	(0.3)
Reclassification of pension liability adjustment to net earnings	1.9	26.2	0.2	26.3
Tax effect	(0.5)	(6.3)	0	(6.4)
Other	0.7	0	0.7	0
Tax effect	(0.2)	0	(0.2)	0
Other comprehensive income, net of tax	2.7	125.1	26.1	64.8
Comprehensive income	$ 654.3	$ 683.3	$ 1,260.1	$ 1,128.4

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)		Dec. 31, 2019	Jun. 30, 2019
Current assets:
Cash and cash equivalents		$ 1,500,400,000	$ 1,949,200,000
Short-term marketable securities		7,200,000	10,500,000
Accounts receivable, net of allowance for doubtful accounts of $53.1 and $54.9, respectively		2,587,900,000	2,439,300,000
Other current assets		660,900,000	509,100,000
Total current assets before funds held for clients		4,756,400,000	4,908,100,000
Funds held for clients		36,608,600,000	29,434,200,000
Total current assets		41,365,000,000	34,342,300,000
Long-term receivables, net of allowance for doubtful accounts of $0.5 and $0.4, respectively		21,600,000	23,800,000
Property, plant and equipment, net		761,300,000	764,200,000
Operating lease right-of-use asset		500,200,000	0
Deferred contract costs		2,397,300,000	2,428,500,000
Other assets		596,600,000	934,400,000
Goodwill		2,314,900,000	2,323,000,000
Intangible assets, net		1,102,500,000	1,071,500,000
Total assets		49,059,400,000	41,887,700,000
Current liabilities:
Accounts payable		132,900,000	125,500,000
Accrued expenses and other current liabilities		2,051,500,000	1,759,000,000
Accrued payroll and payroll-related expenses		428,700,000	721,100,000
Dividends payable		389,300,000	340,100,000
Short-term deferred revenues		210,400,000	220,700,000
Obligations under reverse repurchase agreements (A)	[1]	0	262,000,000
Short-term debt		1,001,600,000	0
Income taxes payable		38,100,000	54,800,000
Total current liabilities before client funds obligations		4,252,500,000	3,483,200,000
Client funds obligations		36,269,900,000	29,144,500,000
Total current liabilities		40,522,400,000	32,627,700,000
Long-term debt		1,003,000,000	2,002,200,000
Operating lease liabilities		360,200,000	0
Other liabilities		726,000,000	798,700,000
Deferred income taxes		702,400,000	659,900,000
Long-term deferred revenues		381,000,000	399,300,000
Total liabilities		43,695,000,000	36,487,800,000
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred stock, $1.00 par value: authorized, 0.3 shares; issued, none		0	0
Common stock, $0.10 par value: authorized, 1,000.0 shares; issued, 638.7 shares at December 31, 2019 and June 30, 2019; outstanding, 431.8 and 434.2 shares at December 31, 2019 and June 30, 2019, respectively		63,900,000	63,900,000
Capital in excess of par value		1,253,700,000	1,183,200,000
Retained earnings		17,987,600,000	17,500,600,000
Treasury stock - at cost: 206.9 and 204.5 shares at December 31, 2019 and June 30, 2019, respectively		(13,709,600,000)	(13,090,500,000)
Accumulated other comprehensive loss		(231,200,000)	(257,300,000)
Total stockholders’ equity		5,364,400,000	5,399,900,000
Total liabilities and stockholders’ equity		$ 49,059,400,000	41,887,700,000
Long-term Marketable Securities Under Reverse Repurchase Agreements			261,400,000
Cash And Cash Equivalents Under Reverse Repurchase Agreements			$ 600,000
[1]	(A) As of June 30, 2019, $261.4 million of long-term marketable securities and $0.6 million

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts - trade receivables - Current	$ 53.1	$ 54.9
Allowance for doubtful accounts - trade receivables - Long-term	$ 0.5	$ 0.4
Preferred stock, par value (in US$ per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	300,000	300,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in US$ per share)	$ 0.1	$ 0.1
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	638,700,000	638,700,000
Common stock, shares outstanding (in shares)	431,800,000	434,200,000
Treasury stock, (in shares)	206,900,000	204,500,000

Statements of Consolidated Cash

Statements of Consolidated Cash Flows - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net earnings	$ 1,234	$ 1,063.6
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization	234.9	196.5
Amortization of deferred contract costs	456	434.6
Deferred income taxes	44.1	33
Stock-based compensation expense	73.3	77
Net pension expense	(0.4)	31.5
Net amortization of premiums and accretion of discounts on available-for-sale securities	26.3	27.4
Impairment of intangible assets	0	12.1
Gain on sale of assets	(2.1)	(4.1)
Other	6.5	18.1
Changes in operating assets and liabilities, net of effects from acquisitions:
Increase in accounts receivable	(198.8)	(670)
Increase in other assets	(605.4)	(594.4)
Increase in accounts payable	12.3	19
(Decrease) / increase in accrued expenses and other liabilities	(149.8)	287.2
Net cash flows provided by operating activities	1,130.9	931.5
Cash Flows from Investing Activities:
Purchases of corporate and client funds marketable securities	(2,875.3)	(1,300.8)
Proceeds from the sales and maturities of corporate and client funds marketable securities	2,995.2	1,163.4
Capital expenditures	(100.7)	(80)
Additions to intangibles	(167.7)	(139.3)
Acquisitions of businesses, net of cash acquired	0	(120.4)
Proceeds from the sale of property, plant, and equipment and other assets	23.6	7.9
Net cash flows used in investing activities	(124.9)	(469.2)
Cash Flows from Financing Activities:
Net increase / (decrease) in client funds obligations	7,093.7	(1,567.1)
Payments of debt	(1.1)	(1.1)
Repurchases of common stock	(615.1)	(526.6)
Net proceeds from stock purchase plan and stock-based compensation plans	(4.4)	5.5
Dividends paid	(686)	(605)
Net payments of reverse repurchase agreements	(262)	0
Net proceeds from commercial paper borrowings	0	1,206
Net cash flows provided by / (used in) financing activities	5,525.1	(1,488.3)
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents	(12.2)	(32.1)
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents	6,518.9	(1,058.1)
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of period	6,796.2	6,542.1
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period	13,315.1	5,484
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents to the Consolidated Balance Sheets
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	13,315.1	5,484
Supplemental disclosures of cash flow information:
Cash paid for interest	70.6	73.3
Cash paid for income taxes, net of income tax refunds	$ 350.4	$ 280.3

Basis of Presentation

Basis of Presentation	6 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Financial Statements and footnotes thereto of Automatic Data Processing, Inc., its subsidiaries and variable interest entity (“ADP” or the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Consolidated Financial Statements and footnotes thereto are unaudited. In the opinion of the Company’s management, the Consolidated Financial Statements reflect all adjustments, which are of a normal recurring nature, that are necessary for a fair presentation of the Company’s interim financial results. The Company has a grantor trust, which holds the majority of the funds provided by its clients pending remittance to employees of those clients, tax authorities, and other payees. The Company is the sole beneficial owner of the trust. The trust meets the criteria in Accounting Standards Codification (“ASC”) 810, “Consolidation” to be characterized as a variable interest entity (“VIE”). The Company has determined that it has a controlling financial interest in the trust because it has both (1) the power to direct the activities that most significantly impact the economic performance of the trust (including the power to make all investment decisions for the trust) and (2) the right to receive benefits that could potentially be significant to the trust (in the form of investment returns) and, therefore, consolidates the trust. Further information on these funds and the Company’s obligations to remit to its clients’ employees, tax authorities, and other payees is provided in Note 6 , “Corporate Investments and Funds Held for Clients.” The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the assets, liabilities, revenue, expenses, and accumulated other comprehensive income that are reported in the Consolidated Financial Statements and footnotes thereto. Actual results may differ from those estimates. Interim financial results are not necessarily indicative of financial results for a full year. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2019 (“fiscal 2019 ”). Revision of Previously Reported Financial Information The Company has historically classified certain fees collected from worksite employers for certain benefits within PEO revenues, and the associated costs of these benefits have historically been classified within operating expenses as PEO zero-margin benefits pass-through costs in the Company's Statements of Consolidated Earnings. During the quarter ended September 30, 2019, management determined that the Company does not retain risk and is acting as the agent, rather than as the primary obligor, for a portion of the fees collected for worksite employee benefits and the worksite employer is primarily responsible for fulfilling certain aspects of the service and has discretion in establishing price. Accordingly, the accompanying Statements of Consolidated Earnings for the three and six months ended December 31, 2018 have been revised to correct the amounts previously reported on a gross basis to a net basis by reducing PEO revenues and operating expenses for associated costs of an equal amount, as follows: Three Months Ended December 31, 2018 As reported Revision As revised PEO revenues $ 1,057.0 (13.5 ) $ 1,043.5 TOTAL REVENUES 3,505.9 (13.5 ) 3,492.4 Operating expenses 1,785.9 (13.5 ) 1,772.4 Total Expenses 2,797.5 (13.5 ) 2,784.0 EARNINGS BEFORE INCOME TAXES 741.0 — 741.0 Provision for income taxes 182.8 — 182.8 NET EARNINGS $ 558.2 — $ 558.2 Six Months Ended December 31, 2018 As reported Revision As revised PEO revenues $ 2,043.7 (26.4 ) $ 2,017.3 TOTAL REVENUES 6,829.1 (26.4 ) 6,802.7 Operating expenses 3,495.9 (26.4 ) 3,469.5 Total Expenses 5,487.8 (26.4 ) 5,461.4 EARNINGS BEFORE INCOME TAXES 1,387.8 — 1,387.8 Provision for income taxes 324.2 — 324.2 NET EARNINGS $ 1,063.6 — $ 1063.6 The correction of these previously reported amounts had no impact on the Company's earnings before income taxes, net earnings, consolidated financial condition or cash flows. In addition, corresponding revisions have been made elsewhere in the Company's consolidated footnote disclosures, where applicable, including its Interim Financial Data by Segment disclosure.

New Accounting Pronouncements

New Accounting Pronouncements	6 Months Ended
	Dec. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements Recently Adopted Accounting Pronouncements Effective July 1, 2019, the Company adopted accounting standard update (“ASU”) 2016-02, “Leases (ASC 842)” under the optional transition method. As a result, the Company recorded on the Consolidated Balance Sheets total operating lease right-of-use (“ROU”) assets of $573.3 million and total operating lease liabilities of $522.6 million , as of the adoption date. The adoption did not have an impact on our Statements of Consolidated Earnings or Statements of Consolidated Cash Flows. Refer to Note 7 for further details. Recently Issued Accounting Pronouncements The following table summarizes recent ASU's issued by the Financial Accounting Standards Board (“FASB”) which have been assessed: Standard Description Effective Date Effect on Financial Statements or Other Significant Matters ASU 2018-14 Compensation-Retirement Benefits-Defined Benefit Plans This update modifies the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans by removing and adding certain disclosures for these plans. The eliminated disclosures include (a) the amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit costs over the next fiscal year, and (b) the effects of a one percentage point change in assumed health care cost trend rates on the net periodic benefit costs and the benefit obligation for post-retirement health care benefits. Additional disclosures include descriptions of significant gains and losses affecting the benefit obligation for the period. The amendments in ASU 2018-14 would need to be applied on a retrospective basis. July 1, 2021 (Fiscal 2022) The adoption of this guidance will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, or cash flows. ASU 2018-13 Fair Value Measurement This update modifies the disclosure requirements on fair value measurements. Certain disclosures in ASU 2018-13 would need to be applied on a retrospective basis and others on a prospective basis. July 1, 2020 (Fiscal 2021) The adoption of this guidance will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, or cash flows. ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments This update introduces the current expected credit loss (CECL) model, which will require an entity to measure credit losses for certain financial instruments and financial assets, including trade receivables. Under this update, on initial recognition and at each reporting period, an entity will be required to recognize an allowance that reflects the entity’s current estimate of credit losses expected to be incurred over the life of the financial instrument. In addition, this update modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. In November 2019, the FASB issued Accounting Standard Update 2019-11 Codification Improvements to Topic 326, Financial-Credit Losses which provides clarification and eliminates inconsistencies to amendments included in Update 2016-13. July 1, 2020 (Fiscal 2021) The adoption of this guidance will not have a material impact on its consolidated results of operations, financial condition, or cash flows.

Revenue

Revenue	6 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Based upon similar operational and economic characteristics, the Company’s revenues are disaggregated by its three strategic pillars: Human Capital Management (“HCM”), HR Outsourcing (“HRO”), and Global (“Global”) Solutions, with separate disaggregation for PEO zero-margin benefits pass-through revenues and client fund interest revenues. The Company believes these revenue categories depict how the nature, amount, timing, and uncertainty of its revenue and cash flows are affected by economic factors. HCM provides a suite of product offerings that assist employers of all types and sizes in all stages of the employment cycle, from recruitment to retirement. Global is generally consistent with the types of services provided within HCM but represents geographies outside of the United States and includes our multinational offerings. HCM and Global revenues are primarily attributable to fees for providing solutions for payroll, benefits, talent, retirement services and HR processing and fees charged to implement the Company's solutions for clients. HRO provides a comprehensive human resources outsourcing solution, including offering benefits, providing workers’ compensation insurance, and administering state unemployment insurance, among other human resources functions. This revenue is primarily driven by the PEO. Amounts collected from PEO worksite employers include payroll, fees for benefits, and an administrative fee that also includes payroll taxes, fees for workers’ compensation and state unemployment taxes. The payroll and payroll taxes collected from the worksite employers are presented in revenue net, as the Company does not retain risk and acts as an agent with respect to this aspect of the PEO arrangement. With respect to the payroll and payroll taxes, the worksite employer is primarily responsible for providing the service and has discretion in establishing wages. The fees collected from the worksite employers for benefits (i.e., PEO benefits pass-throughs), workers’ compensation and state unemployment taxes are presented in revenues and the associated costs of benefits, workers’ compensation and state unemployment taxes are included in operating expenses, as the Company acts as a principal with respect to this aspect of the arrangement. With respect to these fees, the Company is primarily responsible for fulfilling the service and has discretion in establishing price. The Company has further disaggregated HRO to separate out its PEO zero-margin benefits pass-through revenues. The Company recognizes client fund interest revenues on collected but not yet remitted funds held for clients in revenues as earned, as the collection, holding and remittance of these funds are critical components of providing these services. The following tables provide details of revenue by our strategic pillars with disaggregation for PEO zero-margin benefits pass-throughs and client fund interest, and include a reconciliation to the Company’s reportable segments: Three Months Ended Six Months Ended December 31, December 31, Types of Revenues 2019 2018 2019 2018 HCM $ 1,647.9 $ 1,599.4 $ 3,216.5 $ 3,114.7 HRO, excluding PEO zero-margin benefits pass-throughs 650.1 614.2 1,241.2 1,176.7 PEO zero-margin benefits pass-throughs 722.4 659.7 1,421.5 1,300.2 Global 511.4 490.0 1,014.5 963.5 Interest on funds held for clients 137.7 129.1 271.5 247.6 Total Revenues $ 3,669.5 $ 3,492.4 $ 7,165.2 $ 6,802.7 Reconciliation of disaggregated revenue to our reportable segments for the three months ended December 31, 2019: Types of Revenues Employer Services PEO Other Total HCM $ 1,649.8 $ — $ (1.9 ) $ 1,647.9 HRO, excluding PEO zero-margin benefits pass-throughs 239.9 411.0 (0.8 ) 650.1 PEO zero-margin benefits pass-throughs — 722.4 — 722.4 Global 511.4 — — 511.4 Interest on funds held for clients 136.4 1.3 — 137.7 Total Segment Revenues $ 2,537.5 $ 1,134.7 $ (2.7 ) $ 3,669.5 Reconciliation of disaggregated revenue to our reportable segments for the three months ended December 31, 2018: Types of Revenues Employer Services PEO Other Total HCM $ 1,599.6 $ — $ (0.2 ) $ 1,599.4 HRO, excluding PEO zero-margin benefits pass-throughs 232.9 383.8 (2.5 ) 614.2 PEO zero-margin benefits pass-throughs — 659.7 — 659.7 Global 490.0 — — 490.0 Interest on funds held for clients 127.9 1.2 — 129.1 Total Segment Revenues $ 2,450.4 $ 1,044.7 $ (2.7 ) $ 3,492.4 Reconciliation of disaggregated revenue to our reportable segments for the six months ended December 31, 2019: Types of Revenues Employer Services PEO Other Total HCM $ 3,219.8 $ — $ (3.3 ) $ 3,216.5 HRO, excluding PEO zero-margin benefits pass-throughs 475.6 767.5 (1.9 ) 1,241.2 PEO zero-margin benefits pass-throughs — 1,421.5 — 1,421.5 Global 1,014.5 — — 1,014.5 Interest on funds held for clients 269.0 2.5 — 271.5 Total Segment Revenues $ 4,978.9 $ 2,191.5 $ (5.2 ) $ 7,165.2 Reconciliation of disaggregated revenue to our reportable segments for the six months ended December 31, 2018: Types of Revenues Employer Services PEO Other Total HCM $ 3,116.4 $ — $ (1.7 ) $ 3,114.7 HRO, excluding PEO zero-margin benefits pass-throughs 463.4 717.1 (3.8 ) 1,176.7 PEO zero-margin benefits pass-throughs — 1,300.2 — 1,300.2 Global 963.5 — — 963.5 Interest on funds held for clients 245.3 2.3 — 247.6 Total Segment Revenues $ 4,788.6 $ 2,019.6 $ (5.5 ) $ 6,802.7 Contract Balances The timing of revenue recognition for HCM, HRO and Global Solutions is consistent with the invoicing of clients, as invoicing occurs in the period the services are provided. Therefore, the Company does not recognize a contract asset or liability resulting from the timing of revenue recognition and invoicing. Changes in deferred revenue related to set up fees for the six months ended December 31, 2019 were as follows: Contract Liability Contract liability, July 1, 2019 $ 563.4 Recognition of revenue included in beginning of year contract liability (88.7 ) Contract liability, net of revenue recognized on contracts during the period 66.1 Currency adjustments (4.0 ) Contract liability, December 31, 2019 $ 536.8

Earnings per Share (EPS)

Earnings per Share (EPS)	6 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings per Share (EPS)	Earnings per Share (“EPS”) Basic Effect of Employee Stock Option Shares Effect of Employee Restricted Stock Shares Diluted Three Months Ended December 31, 2019 Net earnings $ 651.6 $ 651.6 Weighted average shares (in millions) 431.5 1.1 0.7 433.3 EPS $ 1.51 $ 1.50 Three Months Ended December 31, 2018 Net earnings $ 558.2 $ 558.2 Weighted average shares (in millions) 435.7 1.2 1.1 438.0 EPS $ 1.28 $ 1.27 Six Months Ended December 31, 2019 Net earnings $ 1,234.0 $ 1,234.0 Weighted average shares (in millions) 432.1 1.1 1.1 434.3 EPS $ 2.86 $ 2.84 Six Months Ended December 31, 2018 Net earnings $ 1,063.6 $ 1,063.6 Weighted average shares (in millions) 436.2 1.3 1.4 438.9 EPS $ 2.44 $ 2.42 Options to purchase 1.3 million and 0.8 million shares of common stock for the three months ended December 31, 2019 and 2018 , respectively, and 1.0 million and 0.6 million shares of common stock for the six months ended December 31, 2019 and 2018 , respectively, were excluded from the calculation of diluted earnings per share because their inclusion would have been anti-dilutive.

Other Income, Net

Other Income, Net	6 Months Ended
	Dec. 31, 2019
Other Income and Expenses [Abstract]
Other Income, Net	Other Income, Net Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Interest income on corporate funds $ (25.7 ) $ (28.1 ) $ (58.0 ) $ (56.6 ) Realized gains on available-for-sale securities (7.6 ) (0.3 ) (10.1 ) (0.6 ) Realized losses on available-for-sale securities 0.5 0.8 0.7 2.0 Impairment of intangible assets — — — 12.1 Gain on sale of assets — (4.1 ) (1.9 ) (4.1 ) Gain on sale of investment (0.2 ) — (0.2 ) — Non-service components of pension expense, net (see Note 11) (13.0 ) (0.9 ) (31.1 ) 0.7 Other income, net $ (46.0 ) $ (32.6 ) $ (100.6 ) $ (46.5 ) In fiscal 2019, the Company wrote down $12.1 million of internally developed software which was determined to have no future use due to redundant software identified as part of an acquisition. In addition, the Company recognized a gain of $4.1 million for the sale of assets in relation to the Service Alignment Initiative.

Corporate Investments and Funds

Corporate Investments and Funds Held For Clients	6 Months Ended
	Dec. 31, 2019
Corporate Investments And Funds Held For Clients [Abstract]
Corporate Investments and Funds Held For Clients	Corporate Investments and Funds Held for Clients Corporate investments and funds held for clients at December 31, 2019 and June 30, 2019 were as follows: December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Market Value (A) Type of issue: Money market securities, cash and other cash equivalents $ 13,315.1 $ — $ — $ 13,315.1 Available-for-sale securities: Corporate bonds 10,933.2 218.8 (2.9 ) 11,149.1 Asset-backed securities 4,205.2 37.6 (3.5 ) 4,239.3 U.S. Treasury securities 3,581.8 26.7 (3.8 ) 3,604.7 U.S. government agency securities 2,046.7 20.9 (1.3 ) 2,066.3 Canadian government obligations and Canadian government agency obligations 1,177.4 3.8 (6.2 ) 1,175.0 Canadian provincial bonds 723.1 10.9 (0.6 ) 733.4 Municipal bonds 586.9 19.0 (0.1 ) 605.8 Other securities 1,208.1 20.8 (1.4 ) 1,227.5 Total available-for-sale securities 24,462.4 358.5 (19.8 ) 24,801.1 Total corporate investments and funds held for clients $ 37,777.5 $ 358.5 $ (19.8 ) $ 38,116.2 (A) Included within available-for-sale securities are corporate investments with fair values of $7.2 million and funds held for clients with fair values of $24,793.9 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy. June 30, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Market Value (B) Type of issue: Money market securities, cash and other cash equivalents $ 6,796.2 $ — $ — $ 6,796.2 Available-for-sale securities: Corporate bonds 10,691.8 182.8 (6.7 ) 10,867.9 Asset-backed securities 4,658.3 37.8 (5.4 ) 4,690.7 U.S. Treasury securities 2,933.0 23.8 (8.0 ) 2,948.8 U.S. government agency securities 2,612.0 17.7 (5.8 ) 2,623.9 Canadian government obligations and Canadian government agency obligations 1,164.1 7.0 (6.0 ) 1,165.1 Canadian provincial bonds 800.2 14.5 (0.5 ) 814.2 Municipal bonds 596.1 16.4 (0.1 ) 612.4 Other securities 1,116.1 20.6 (0.6 ) 1,136.1 Total available-for-sale securities 24,571.6 320.6 (33.1 ) 24,859.1 Total corporate investments and funds held for clients $ 31,367.8 $ 320.6 $ (33.1 ) $ 31,655.3 (B) Included within available-for-sale securities are corporate investments with fair values of $271.9 million and funds held for clients with fair values of $24,587.2 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy. For a description of the fair value hierarchy and the Company's fair value methodologies, including the use of an independent third-party pricing service, see Note 1 “Summary of Significant Accounting Policies” in the Company's Annual Report on Form 10-K for fiscal 2019 . The Company did not transfer any assets between Levels during the six months ended December 31, 2019 or fiscal 2019 . In addition, the Company concurred with and did not adjust the prices obtained from the independent pricing service. The Company had no available-for-sale securities included in Level 1 or Level 3 at December 31, 2019 . The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of December 31, 2019 , are as follows: December 31, 2019 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Value Gross Fair Market Value Gross Unrealized Losses Fair Market Value Corporate bonds $ (2.6 ) $ 715.4 $ (0.3 ) $ 260.3 $ (2.9 ) $ 975.7 Asset-backed securities (2.6 ) 593.2 (0.9 ) 628.8 (3.5 ) 1,222.0 U.S. Treasury securities (0.4 ) 257.5 (3.4 ) 1,005.0 (3.8 ) 1,262.5 U.S. government agency securities (0.7 ) 91.7 (0.6 ) 743.3 (1.3 ) 835.0 Canadian government obligations and Canadian government agency obligations (6.2 ) 870.1 — — (6.2 ) 870.1 Canadian provincial bonds (0.6 ) 113.8 — 30.5 (0.6 ) 144.3 Municipal bonds (0.1 ) 19.0 — 6.6 (0.1 ) 25.6 Other securities (1.1 ) 140.6 (0.3 ) 67.2 (1.4 ) 207.8 $ (14.3 ) $ 2,801.3 $ (5.5 ) $ 2,741.7 $ (19.8 ) $ 5,543.0 The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2019 , are as follows: June 30, 2019 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Value Gross Fair Market Value Gross Unrealized Losses Fair Market Value Corporate bonds $ (0.6 ) $ 151.9 $ (6.1 ) $ 2,055.6 $ (6.7 ) $ 2,207.5 Asset-backed securities (0.2 ) 171.9 (5.2 ) 2,083.5 (5.4 ) 2,255.4 U.S. Treasury securities — 1.8 (8.0 ) 1,159.4 (8.0 ) 1,161.2 U.S. government agency securities — — (5.8 ) 1,671.4 (5.8 ) 1,671.4 Canadian government obligations and Canadian government agency obligations (6.0 ) 662.7 — 1.1 (6.0 ) 663.8 Canadian provincial bonds (0.3 ) 81.5 (0.2 ) 50.1 (0.5 ) 131.6 Municipal bonds — 1.5 (0.1 ) 23.3 (0.1 ) 24.8 Other securities (0.1 ) 36.4 (0.5 ) 148.1 (0.6 ) 184.5 $ (7.2 ) $ 1,107.7 $ (25.9 ) $ 7,192.5 $ (33.1 ) $ 8,300.2 At December 31, 2019 , Corporate bonds include investment-grade debt securities with a wide variety of issuers, industries, and sectors, primarily carry credit ratings of A and above, and have maturities ranging from January 2020 through November 2029 . At December 31, 2019 , asset-backed securities include AAA-rated senior tranches of securities with predominantly prime collateral of fixed-rate auto loan, credit card, equipment lease, and rate reduction receivables with fair values of $2,101.3 million , $1,597.4 million , $418.8 million , and $121.8 million , respectively. These securities are collateralized by the cash flows of the underlying pools of receivables. The primary risk associated with these securities is the collection risk of the underlying receivables. All collateral on such asset-backed securities has performed as expected through December 31, 2019 . At December 31, 2019 , U.S. government agency securities primarily include debt directly issued by Federal Home Loan Banks and Federal Farm Credit Banks with fair values of $1,150.0 million and $715.6 million , respectively. U.S. government agency securities represent senior, unsecured, non-callable debt that primarily carry ratings of Aaa by Moody's, and AA+ by Standard & Poor's, with maturities ranging from January 2020 through December 2029 . At December 31, 2019 , other securities and their fair value primarily include U.S. government agency commercial mortgage-backed securities of $739.3 million issued by Federal Home Loan Mortgage Corporation and Federal National Mortgage Association, Aa2-rated United Kingdom Gilt securities of $201.9 million , and AAA-rated and AA-rated supranational bonds of $90.6 million . Classification of corporate investments on the Consolidated Balance Sheets is as follows: December 31, June 30, 2019 2019 Corporate investments: Cash and cash equivalents $ 1,500.4 $ 1,949.2 Short-term marketable securities 7.2 10.5 Long-term marketable securities (a) — 261.4 Total corporate investments $ 1,507.6 $ 2,221.1 (a) - Long-term marketable securities are included within Other assets on the Consolidated Balance Sheets. Funds held for clients represent assets that, based upon the Company's intent, are restricted for use solely for the purposes of satisfying the obligations to remit funds relating to the Company’s payroll and payroll tax filing services, which are classified as client funds obligations on our Consolidated Balance Sheets. Funds held for clients have been invested in the following categories: December 31, June 30, 2019 2019 Funds held for clients: Restricted cash and cash equivalents held to satisfy client funds obligations $ 11,814.7 $ 4,847.0 Restricted short-term marketable securities held to satisfy client funds obligations 5,241.3 5,013.9 Restricted long-term marketable securities held to satisfy client funds obligations 19,552.6 19,573.3 Total funds held for clients $ 36,608.6 $ 29,434.2 Client funds obligations represent the Company's contractual obligations to remit funds to satisfy clients' payroll, tax, and other payee payment obligations and are recorded on the Consolidated Balance Sheets at the time that the Company impounds funds from clients. The client funds obligations represent liabilities that will be repaid within one year of the balance sheet date. The Company has reported client funds obligations as a current liability on the Consolidated Balance Sheets totaling $36,269.9 million and $29,144.5 million at December 31, 2019 and June 30, 2019 , respectively. The Company has classified funds held for clients as a current asset since these funds are held solely for the purpose of satisfying the client funds obligations. Of the Company’s funds held for clients at December 31, 2019 and June 30, 2019 , $33,001.5 million and $26,648.0 million , respectively, are held in the grantor trust. The liabilities held within the trust are intercompany liabilities to other Company subsidiaries and are eliminated in consolidation. The Company has reported the cash flows related to the purchases of corporate and client funds marketable securities and related to the proceeds from the sales and maturities of corporate and client funds marketable securities on a gross basis in the investing section of the Statements of Consolidated Cash Flows. The Company has reported the cash and cash equivalents related to client funds investments with original maturities of ninety days or less , within the beginning and ending balances of cash, cash equivalents, restricted cash, and restricted cash equivalents. These amounts have been reconciled to the Consolidated Balance Sheets on the Statements of Consolidated Cash Flows. The Company has reported the cash flows related to the cash received from and paid on behalf of clients on a net basis within net increase / (decrease) in client funds obligations in the financing activities section of the Statements of Consolidated Cash Flows. Approximately 78% of the available-for-sale securities held a AAA-rating or AA-rating at December 31, 2019 , as rated by Moody's, Standard & Poor's, DBRS for Canadian dollar-denominated securities, and Fitch for asset-backed and commercial mortgage-backed securities. All available-for-sale securities were rated as investment grade at December 31, 2019 . Expected maturities of available-for-sale securities at December 31, 2019 are as follows: One year or less $ 5,248.5 One year to two years 5,107.8 Two years to three years 4,930.4 Three years to four years 3,740.3 After four years 5,774.1 Total available-for-sale securities $ 24,801.1

Leases

Leases	6 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	Leases During the first quarter of the fiscal year ending June 30, 2020 ("fiscal 2020"), the Company adopted ASC 842 using the optional transition method under which financial results reported in periods prior were not adjusted and continue to be reported in accordance with historic accounting under ASC 840 - Leases. The Company elected the following practical expedients permitted under the lease standard: • The Company did not reassess prior conclusions about lease identification, lease classification or initial direct costs, and did not use hindsight for leases existing at adoption date. • The Company did not record leases with an initial term of 12 months or less on the consolidated balance sheet but continues to expense them on a straight-line basis over the lease term. • The Company elected to combine lease and non-lease components for our facilities leases only. Non-lease components consist primarily of maintenance services. The Company records leases on the consolidated balance sheets as operating lease ROU assets, records the current portion of operating lease liabilities within accrued expenses and other current liabilities and, separately, records long-term operating lease liabilities. The Company has entered into operating lease agreements for facilities and equipment. The Company's leases have remaining lease terms of up to approximately ten years . Operating lease ROU assets and operating lease liabilities are recognized at the lease commencement date based on the present value of the lease payments over the lease term. The lease liabilities are measured by discounting future lease payments at the Company’s collateralized incremental borrowing rate for financing instruments of a similar term, unless the implicit rate is readily determinable. ROU assets also include adjustments related to prepaid or deferred lease payments and lease incentives. As of December 31, 2019 , total operating lease ROU assets were $500.2 million , current and long-term operating lease liabilities were approximately $104.5 million and $360.2 million , respectively. The difference between total ROU assets and total lease liabilities are primarily attributable to pre-payments of our obligations and the recognition of various lease incentives. The components of operating lease expense were as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2019 Operating lease cost $ 42.3 $ 86.5 Short-term lease cost 1.2 3.9 Variable lease cost 0.7 2.0 Total operating lease cost $ 44.2 $ 92.4 Information related to our operating lease ROU assets and operating lease liabilities was as follows: December 31, 2019 Cash paid for operating lease liabilities $ 75.8 Operating lease ROU assets obtained in exchange for new operating lease liabilities $ 17.4 Weighted-average remaining lease term (in years) 6 Weighted-average discount rate 2.4 % As of December 31, 2019 , maturities of operating lease liabilities are as follows: Six months ending June 30, 2020 $ 58.9 Twelve months ending June 30, 2021 102.4 Twelve months ending June 30, 2022 85.4 Twelve months ending June 30, 2023 73.1 Twelve months ending June 30, 2024 51.4 Thereafter 128.6 Total undiscounted lease obligations 499.8 Less: Imputed interest (35.1 ) Net lease obligations $ 464.7

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, net	6 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles Assets, net	Goodwill and Intangible Assets, net Changes in goodwill for the six months ended December 31, 2019 are as follows: Employer Services PEO Services Total Balance at June 30, 2019 $ 2,318.2 $ 4.8 $ 2,323.0 Additions and other adjustments (2.5 ) — (2.5 ) Currency translation adjustments (5.6 ) — (5.6 ) Balance at December 31, 2019 $ 2,310.1 $ 4.8 $ 2,314.9 Components of intangible assets, net, are as follows: December 31, June 30, 2019 2019 Intangible assets: Software and software licenses $ 2,617.6 $ 2,519.3 Customer contracts and lists 900.4 860.7 Other intangibles 238.9 237.9 3,756.9 3,617.9 Less accumulated amortization: Software and software licenses (1,840.3 ) (1,762.3 ) Customer contracts and lists (593.8 ) (566.4 ) Other intangibles (220.3 ) (217.7 ) (2,654.4 ) (2,546.4 ) Intangible assets, net $ 1,102.5 $ 1,071.5 Other intangibles consist primarily of purchased rights, trademarks and trade names (acquired directly or through acquisitions). All intangible assets have finite lives and, as such, are subject to amortization. The weighted average remaining useful life of the intangible assets is 6 years ( 6 years for software and software licenses, 6 years for customer contracts and lists, and 4 years for other intangibles). Amortization of intangible assets was $69.7 million and $55.4 million for the three months ended December 31, 2019 and 2018 , respectively, and $139.1 million and $108.8 million for the six months ended December 31, 2019 and 2018 , respectively. Estimated future amortization expenses of the Company's existing intangible assets are as follows: Amount Six months ending June 30, 2020 $ 147.6 Twelve months ending June 30, 2021 $ 241.8 Twelve months ending June 30, 2022 $ 194.1 Twelve months ending June 30, 2023 $ 154.5 Twelve months ending June 30, 2024 $ 120.4 Twelve months ending June 30, 2025 $ 69.1

Short-term Financing

Short-term Financing	6 Months Ended
	Dec. 31, 2019
Short-Term Financing [Abstract]
Short-term Financing	Short-term Financing The Company has a $3.8 billion , 364 -day credit agreement that matures in June 2020 with a one year term-out option. The Company also has a $2.75 billion five year credit facility that matures in June 2024 that contains an accordion feature under which the aggregate commitment can be increased by $500 million , subject to the availability of additional commitments. In addition, the Company has a five year $3.75 billion credit facility maturing in June 2023 that also contains an accordion feature under which the aggregate commitment can be increased by $500 million , subject to the availability of additional commitments. The interest rate applicable to committed borrowings is tied to LIBOR, the effective federal funds rate, or the prime rate, depending on the notification provided by the Company to the syndicated financial institutions prior to borrowing. The Company is also required to pay facility fees on the credit agreements. The primary uses of the credit facilities are to provide liquidity to the commercial paper program and funding for general corporate purposes, if necessary. The Company had no borrowings through December 31, 2019 under the credit agreements. The Company's U.S. short-term funding requirements related to client funds are sometimes obtained on an unsecured basis through the issuance of commercial paper, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. This commercial paper program provides for the issuance of up to $10.3 billion in aggregate maturity value. The Company’s commercial paper program is rated A-1+ by Standard & Poor’s and Prime-1 (“P-1”) by Moody’s. These ratings denote the highest quality commercial paper securities. Maturities of commercial paper can range from overnight to up to 364 days . At December 31, 2019 and June 30, 2019 , the Company had no commercial paper borrowing outstanding. Details of the borrowings under the commercial paper program are as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Average daily borrowings (in billions) $ 3.5 $ 3.8 $ 3.7 $ 3.8 Weighted average interest rates 1.7 % 2.3 % 2.0 % 2.1 % Weighted average maturity (approximately in days) 2 days 2 days 2 days 2 days The Company’s U.S., Canadian and United Kingdom short-term funding requirements related to client funds obligations are sometimes obtained on a secured basis through the use of reverse repurchase agreements, which are collateralized principally by government and government agency securities, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. These agreements generally have terms ranging from overnight to up to five business days . At December 31, 2019 there were no outstanding obligations related to reverse repurchase agreements. At June 30, 2019 , the Company had $262.0 million of outstanding obligations related to the reverse repurchase agreements, which were fully paid in early July 2019. Details of the reverse repurchase agreements are as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Average outstanding balances $ 335.9 $ 325.4 $ 381.2 $ 410.2 Weighted average interest rates 1.7 % 1.9 % 1.8 % 1.8 %

Long-term Debt

Long-term Debt	6 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	Debt The Company has fixed-rate notes with 5 -year and 10 -year maturities for an aggregate principal amount of $2.0 billion (collectively the “Notes”). The Notes are senior unsecured obligations, and interest is payable in arrears, semi-annually. The principal amounts and associated effective interest rates of the Notes and other debt as of December 31, 2019 and June 30, 2019 , are as follows: Debt instrument Effective Interest Rate December 31, 2019 June 30, 2019 Fixed-rate 2.25% notes due September 15, 2020 2.37% $ 1,000.0 $ 1,000.0 Fixed-rate 3.375% notes due September 15, 2025 3.47% 1,000.0 1,000.0 Other 8.9 10.9 2,008.9 2,010.9 Less: current portion (1,001.6 ) (2.5 ) Less: unamortized discount and debt issuance costs (4.3 ) (6.2 ) Total long-term debt $ 1,003.0 $ 2,002.2 The effective interest rates for the Notes include the interest on the Notes and amortization of the discount and debt issuance costs. As of December 31, 2019 , the fair value of the Notes, based on Level 2 inputs, was $2,068.9 million . For a description of the fair value hierarchy and the Company's fair value methodologies, including the use of an independent third-party service, see Note 1 “Summary of Significant Accounting Policies” in the Company's Annual Report on Form 10-K for fiscal 2019

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Pension Plans	Employee Benefit PlansStock-based Compensation Plans. Stock-based compensation consists of the following: The Company's share-based compensation consists of stock options, time-based restricted stock, time-based restricted stock units, performance-based restricted stock, and performance-based restricted stock units. The Company also offers an employee stock purchase plan for eligible employees. The Company currently utilizes treasury stock to satisfy stock option exercises, issuances under the Company's employee stock purchase plan, and restricted stock awards. From time to time, the Company may repurchase shares of its common stock under its authorized share repurchase program. In November 2019, the Board of Directors authorized the repurchase of $5 billion of our common stock, replacing in its entirety the previous 2015 authorization to purchase up to 25 million shares of our common stock. The Company repurchased 1.8 million and 2.2 million shares in the three months ended December 31, 2019 and 2018 , respectively, of which $155.4 million in the three months ended December 31, 2019 were repurchased under the November 2019 authorization. The Company repurchased 3.7 million and 3.8 million shares in the six months ended December 31, 2019 and 2018 , respectively. The Company considers several factors in determining when to execute share repurchases, including, among other things, actual and potential acquisition activity, cash balances and cash flows, issuances due to employee benefit plan activity, and market conditions. The following table represents pre-tax stock-based compensation expense for the three and six months ended December 31, 2019 and 2018 , respectively: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Operating expenses $ 3.4 $ 3.4 $ 7.4 $ 8.8 Selling, general and administrative expenses 28.0 30.4 56.3 58.4 System development and programming costs 4.8 4.8 9.6 9.8 Total stock-based compensation expense $ 36.2 $ 38.6 $ 73.3 $ 77.0 The methods and assumptions used in the determination of the fair value of stock-based awards are consistent with those described in the Company's Form 10-K for fiscal 2019. See the Company's Annual Report on Form 10-K for fiscal 2019 for a detailed description of the Company's stock-based compensation awards and employee stock purchase plan, including information related to vesting terms, service and performance conditions, payout percentages, and process for estimating the fair value of stock options granted. The components of net pension expense were as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Service cost – benefits earned during the period $ 14.9 $ 14.9 $ 29.9 $ 29.9 Interest cost on projected benefits 15.4 19.7 30.9 39.3 Expected return on plan assets (29.5 ) (33.0 ) (59.0 ) (65.9 ) Net amortization and deferral 1.5 — 2.9 0.1 Settlement charges and special termination benefits — 12.8 (5.1 ) 28.1 Net pension expense $ 2.3 $ 14.4 $ (0.4 ) $ 31.5 In fiscal 2018, the Company offered a Voluntary Early Retirement Program (“VERP”) to certain eligible U.S.-based associates aged 55 or above with at least 10 years of service. During the three and six months ended December 31, 2018 , the Company recorded $12.8 million and $28.1 million

Income Taxes

Income Taxes	6 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended December 31, 2019 and 2018 was 22.0% and 24.7% , respectively. The decrease in the effective tax rate is primarily due to the release of a valuation allowance related to foreign tax credit carryforwards and a reduction in the operating tax rate due to the mix between domestic and foreign earnings. The effective tax rate for the six months ended December 31, 2019 and 2018 was 21.6% and 23.4% , respectively. The decrease in the effective tax rate is primarily due to the release of a valuation allowance related to foreign tax credit carryforwards, a reduction in the operating tax rate due to the mix between domestic and foreign earnings and an increase in tax incentives related to our software development activities.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In June 2018, a potential class action complaint was filed against ADP in the Circuit Court of Cook County, Illinois. The complaint asserts that ADP violated the Illinois Biometric Privacy Act, was negligent and unjustly enriched itself in connection with its collection, use and storage of biometric data of employees of its clients who are residents of Illinois in connection with certain services provided by ADP to clients in Illinois. The complaint seeks statutory and other unspecified monetary damages, injunctive relief and attorney’s fees. In addition, similar potential class action complaints have been filed in Illinois state courts against ADP and/or certain of its clients with respect to the collection, use and storage of biometric data of the employees of these clients. All of these claims are still in their earliest stages and the Company is unable to estimate any reasonably possible loss, or range of loss, with respect to these matters. The Company intends to vigorously defend against these lawsuits. The Company is subject to various claims, litigation and regulatory compliance matters in the normal course of business. When a loss is considered probable and reasonably estimable, the Company records a liability in the amount of its best estimate for the ultimate loss. Management currently believes that the resolution of these claims, litigation and regulatory compliance matters against us, individually or in the aggregate, will not have a material adverse impact on our consolidated results of operations, financial condition or cash flows. These matters are subject to inherent uncertainties and management's view of these matters may change in the future. It is not the Company’s business practice to enter into off-balance sheet arrangements. In the normal course of business, the Company may enter into contracts in which it makes representations and warranties that relate to the performance of the Company’s services and products. The Company does not expect any material losses related to such representations and warranties.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Dec. 31, 2019
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity	Stockholders' Equity Changes in stockholders' equity by component are as follows: Three Months Ended December 31, 2019 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at September 30, 2019 $ 63.9 $ 1,213.7 $ 17,729.6 $ (13,412.6 ) $ (233.9 ) $ 5,360.7 Net earnings — — 651.6 — — 651.6 Other comprehensive income — — — — 2.7 2.7 Stock-based compensation expense — 31.3 — — — 31.3 Issuances relating to stock compensation plans — 8.7 — 14.5 — 23.2 Treasury stock acquired (1.8 shares) — — — (311.5 ) — (311.5 ) Dividends declared ($0.91 per share) — — (393.6 ) — — (393.6 ) Balance at December 31, 2019 $ 63.9 $ 1,253.7 $ 17,987.6 $ (13,709.6 ) $ (231.2 ) $ 5,364.4 Three Months Ended December 31, 2018 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at September 30, 2018 $ 63.9 $ 1,035.1 $ 16,741.1 $ (12,421.2 ) $ (740.1 ) $ 4,678.8 Net earnings — — 558.2 — — 558.2 Other comprehensive income — — — — 125.1 125.1 Stock-based compensation expense — 35.0 — — — 35.0 Issuances relating to stock compensation plans — 6.0 — 13.3 — 19.3 Treasury stock acquired (2.2 shares) — — — (312.3 ) — (312.3 ) Dividends declared ($0.79 per share) — — (340.2 ) — — (340.2 ) Balance at December 31, 2018 $ 63.9 $ 1,076.1 $ 16,959.1 $ (12,720.2 ) $ (615.0 ) $ 4,763.9 Six Months Ended December 31, 2019 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2019 $ 63.9 $ 1,183.2 $ 17,500.6 $ (13,090.5 ) $ (257.3 ) $ 5,399.9 Net earnings — — 1,234.0 — — 1,234.0 Other comprehensive income — — — — 26.1 26.1 Stock-based compensation expense — 67.3 — — — 67.3 Issuances relating to stock compensation plans — 3.2 — 84.9 — 88.1 Treasury stock acquired (3.7 shares) — — — (704.0 ) — (704.0 ) Dividends declared ($1.70 per share) — — (740.2 ) — — (740.2 ) Other — — (6.8 ) — — (6.8 ) Balance at December 31, 2019 $ 63.9 $ 1,253.7 $ 17,987.6 $ (13,709.6 ) $ (231.2 ) $ 5,364.4 Six Months Ended December 31, 2018 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2018 $ 63.9 $ 1,014.8 $ 16,546.6 $ (12,209.6 ) $ (679.8 ) $ 4,735.9 Net earnings — — 1,063.6 — — 1,063.6 Other comprehensive income — — — — 64.8 64.8 Stock-based compensation expense — 69.7 — — — 69.7 Issuances relating to stock compensation plans — (8.4 ) — 83.5 — 75.1 Treasury stock acquired (3.8 shares) — — — (594.1 ) — (594.1 ) Dividends declared ($1.48 per share) — — (651.1 ) — — (651.1 ) Balance at December 31, 2018 $ 63.9 $ 1,076.1 $ 16,959.1 $ (12,720.2 ) $ (615.0 ) $ 4,763.9

Reclassifications out of Accumu

Reclassifications out of Accumulated Other Comprehensive Income (AOCI)	6 Months Ended
	Dec. 31, 2019
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Reclassifications out of Accumulated Other Comprehensive Income (AOCI)	Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) Changes in AOCI by component are as follows: Three Months Ended December 31, 2019 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Other Accumulated Other Comprehensive Loss Balance at September 30, 2019 $ (318.1 ) $ 298.1 $ (213.9 ) $ — $ (233.9 ) Other comprehensive (loss)/income before reclassification adjustments 34.3 (35.5 ) — 0.7 (0.5 ) Tax effect — 7.5 — (0.2 ) 7.3 Reclassification adjustments to — (7.1 ) (A) 1.9 (B) — (5.2 ) Tax effect — 1.6 (0.5 ) — 1.1 Balance at December 31, 2019 $ (283.8 ) $ 264.6 $ (212.5 ) $ 0.5 $ (231.2 ) Three Months Ended December 31, 2018 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Accumulated Other Comprehensive Loss Balance at September 30, 2018 $ (249.9 ) $ (311.4 ) $ (178.8 ) $ (740.1 ) Other comprehensive (loss)/income before reclassification adjustments (24.7 ) 168.3 — 143.6 Tax effect — (38.8 ) — (38.8 ) Reclassification adjustments to net earnings — 0.5 (A) 26.2 (B) 26.7 Tax effect — (0.1 ) (6.3 ) (6.4 ) Balance at December 31, 2018 $ (274.6 ) $ (181.5 ) $ (158.9 ) $ (615.0 ) Six Months Ended December 31, 2019 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Other Accumulated Other Comprehensive Loss Balance at June 30, 2019 $ (269.2 ) $ 224.6 $ (212.7 ) $ — $ (257.3 ) Other comprehensive (loss)/income before reclassification adjustments (14.6 ) 60.6 — 0.7 46.7 Tax effect — (13.3 ) — (0.2 ) (13.5 ) Reclassification adjustments to net earnings — (9.4 ) (A) 0.2 (B) — (9.2 ) Tax effect — 2.1 — — 2.1 Balance at December 31, 2019 $ (283.8 ) $ 264.6 $ (212.5 ) $ 0.5 $ (231.2 ) Six Months Ended December 31, 2018 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Accumulated Other Comprehensive Loss Balance at June 30, 2018 $ (227.0 ) $ (274.0 ) $ (178.8 ) $ (679.8 ) Other comprehensive (loss)/income before reclassification adjustments (47.6 ) 118.0 — 70.4 Tax effect — (26.6 ) — (26.6 ) Reclassification adjustments to net earnings — 1.4 (A) 26.3 (B) 27.7 Tax effect — (0.3 ) (6.4 ) (6.7 ) Balance at December 31, 2018 $ (274.6 ) $ (181.5 ) $ (158.9 ) $ (615.0 ) (A) Reclassification adjustments out of AOCI are included within Other income, net, on the Statements of Consolidated Earnings. (B) Reclassification adjustments out of AOCI are included in net pension expense (see Note 11 ).

Interim Financial Data by Segme

Interim Financial Data by Segment	6 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Interim Financial Data by Segment	Interim Financial Data by Segment Based upon similar economic and operational characteristics, the Company’s strategic business units have been aggregated into the following two reportable segments: Employer Services and PEO Services. The primary components of the “Other” segment are certain corporate overhead charges and expenses that have not been allocated to the reportable segments, including corporate functions, costs related to our transformation office, non-recurring gains and losses, the elimination of intercompany transactions, and interest expense. Certain revenues and expenses are charged to the reportable segments at a standard rate for management reasons. Other costs are recorded based on management responsibility. Beginning in the first quarter of fiscal 2020, the Company made changes to the allocation methodology for certain corporate allocations, in both the current period and the prior period in the table below, which did not materially affect reportable segment results. In addition, the segment results in the table below reflect the impact of the revision to PEO revenues for comparability. Refer to Note 1 to our Consolidated Financial Statements for more information on this revision. Segment Results: Revenues Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Employer Services $ 2,537.5 $ 2,450.4 $ 4,978.9 $ 4,788.6 PEO Services 1,134.7 1,044.7 2,191.5 2,019.6 Other (2.7 ) (2.7 ) (5.2 ) (5.5 ) $ 3,669.5 $ 3,492.4 $ 7,165.2 $ 6,802.7 Earnings before Income Taxes Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Employer Services $ 767.4 $ 733.0 $ 1,448.4 $ 1,372.9 PEO Services 167.1 157.3 315.5 301.1 Other (99.0 ) (149.3 ) (189.3 ) (286.2 ) $ 835.5 $ 741.0 $ 1,574.6 $ 1,387.8

Basis of Presentation (Tables)

Basis of Presentation (Tables)	6 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Revision to Previously Reported Financial Information	the accompanying Statements of Consolidated Earnings for the three and six months ended December 31, 2018 have been revised to correct the amounts previously reported on a gross basis to a net basis by reducing PEO revenues and operating expenses for associated costs of an equal amount, as follows: Three Months Ended December 31, 2018 As reported Revision As revised PEO revenues $ 1,057.0 (13.5 ) $ 1,043.5 TOTAL REVENUES 3,505.9 (13.5 ) 3,492.4 Operating expenses 1,785.9 (13.5 ) 1,772.4 Total Expenses 2,797.5 (13.5 ) 2,784.0 EARNINGS BEFORE INCOME TAXES 741.0 — 741.0 Provision for income taxes 182.8 — 182.8 NET EARNINGS $ 558.2 — $ 558.2 Six Months Ended December 31, 2018 As reported Revision As revised PEO revenues $ 2,043.7 (26.4 ) $ 2,017.3 TOTAL REVENUES 6,829.1 (26.4 ) 6,802.7 Operating expenses 3,495.9 (26.4 ) 3,469.5 Total Expenses 5,487.8 (26.4 ) 5,461.4 EARNINGS BEFORE INCOME TAXES 1,387.8 — 1,387.8 Provision for income taxes 324.2 — 324.2 NET EARNINGS $ 1,063.6 — $ 1063.6

New Accounting Pronouncements (

New Accounting Pronouncements (Tables)	6 Months Ended
	Dec. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Recently Issued Accounting Pronouncements The following table summarizes recent ASU's issued by the Financial Accounting Standards Board (“FASB”) which have been assessed: Standard Description Effective Date Effect on Financial Statements or Other Significant Matters ASU 2018-14 Compensation-Retirement Benefits-Defined Benefit Plans This update modifies the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans by removing and adding certain disclosures for these plans. The eliminated disclosures include (a) the amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit costs over the next fiscal year, and (b) the effects of a one percentage point change in assumed health care cost trend rates on the net periodic benefit costs and the benefit obligation for post-retirement health care benefits. Additional disclosures include descriptions of significant gains and losses affecting the benefit obligation for the period. The amendments in ASU 2018-14 would need to be applied on a retrospective basis. July 1, 2021 (Fiscal 2022) The adoption of this guidance will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, or cash flows. ASU 2018-13 Fair Value Measurement This update modifies the disclosure requirements on fair value measurements. Certain disclosures in ASU 2018-13 would need to be applied on a retrospective basis and others on a prospective basis. July 1, 2020 (Fiscal 2021) The adoption of this guidance will modify disclosures but will not have an impact on the Company's consolidated results of operations, financial condition, or cash flows. ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments This update introduces the current expected credit loss (CECL) model, which will require an entity to measure credit losses for certain financial instruments and financial assets, including trade receivables. Under this update, on initial recognition and at each reporting period, an entity will be required to recognize an allowance that reflects the entity’s current estimate of credit losses expected to be incurred over the life of the financial instrument. In addition, this update modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. In November 2019, the FASB issued Accounting Standard Update 2019-11 Codification Improvements to Topic 326, Financial-Credit Losses which provides clarification and eliminates inconsistencies to amendments included in Update 2016-13. July 1, 2020 (Fiscal 2021) The adoption of this guidance will not have a material impact on its consolidated results of operations, financial condition, or cash flows.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Reconciliation of disaggregated revenue to our reportable segments for the three months ended December 31, 2019: Types of Revenues Employer Services PEO Other Total HCM $ 1,649.8 $ — $ (1.9 ) $ 1,647.9 HRO, excluding PEO zero-margin benefits pass-throughs 239.9 411.0 (0.8 ) 650.1 PEO zero-margin benefits pass-throughs — 722.4 — 722.4 Global 511.4 — — 511.4 Interest on funds held for clients 136.4 1.3 — 137.7 Total Segment Revenues $ 2,537.5 $ 1,134.7 $ (2.7 ) $ 3,669.5 Reconciliation of disaggregated revenue to our reportable segments for the three months ended December 31, 2018: Types of Revenues Employer Services PEO Other Total HCM $ 1,599.6 $ — $ (0.2 ) $ 1,599.4 HRO, excluding PEO zero-margin benefits pass-throughs 232.9 383.8 (2.5 ) 614.2 PEO zero-margin benefits pass-throughs — 659.7 — 659.7 Global 490.0 — — 490.0 Interest on funds held for clients 127.9 1.2 — 129.1 Total Segment Revenues $ 2,450.4 $ 1,044.7 $ (2.7 ) $ 3,492.4 Reconciliation of disaggregated revenue to our reportable segments for the six months ended December 31, 2019: Types of Revenues Employer Services PEO Other Total HCM $ 3,219.8 $ — $ (3.3 ) $ 3,216.5 HRO, excluding PEO zero-margin benefits pass-throughs 475.6 767.5 (1.9 ) 1,241.2 PEO zero-margin benefits pass-throughs — 1,421.5 — 1,421.5 Global 1,014.5 — — 1,014.5 Interest on funds held for clients 269.0 2.5 — 271.5 Total Segment Revenues $ 4,978.9 $ 2,191.5 $ (5.2 ) $ 7,165.2 Reconciliation of disaggregated revenue to our reportable segments for the six months ended December 31, 2018: Types of Revenues Employer Services PEO Other Total HCM $ 3,116.4 $ — $ (1.7 ) $ 3,114.7 HRO, excluding PEO zero-margin benefits pass-throughs 463.4 717.1 (3.8 ) 1,176.7 PEO zero-margin benefits pass-throughs — 1,300.2 — 1,300.2 Global 963.5 — — 963.5 Interest on funds held for clients 245.3 2.3 — 247.6 Total Segment Revenues $ 4,788.6 $ 2,019.6 $ (5.5 ) $ 6,802.7 The following tables provide details of revenue by our strategic pillars with disaggregation for PEO zero-margin benefits pass-throughs and client fund interest, and include a reconciliation to the Company’s reportable segments: Three Months Ended Six Months Ended December 31, December 31, Types of Revenues 2019 2018 2019 2018 HCM $ 1,647.9 $ 1,599.4 $ 3,216.5 $ 3,114.7 HRO, excluding PEO zero-margin benefits pass-throughs 650.1 614.2 1,241.2 1,176.7 PEO zero-margin benefits pass-throughs 722.4 659.7 1,421.5 1,300.2 Global 511.4 490.0 1,014.5 963.5 Interest on funds held for clients 137.7 129.1 271.5 247.6 Total Revenues $ 3,669.5 $ 3,492.4 $ 7,165.2 $ 6,802.7
Contract with Customer, Liability	Changes in deferred revenue related to set up fees for the six months ended December 31, 2019 were as follows: Contract Liability Contract liability, July 1, 2019 $ 563.4 Recognition of revenue included in beginning of year contract liability (88.7 ) Contract liability, net of revenue recognized on contracts during the period 66.1 Currency adjustments (4.0 ) Contract liability, December 31, 2019 $ 536.8

Earnings per Share (EPS) (Table

Earnings per Share (EPS) (Tables)	6 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Basic Effect of Employee Stock Option Shares Effect of Employee Restricted Stock Shares Diluted Three Months Ended December 31, 2019 Net earnings $ 651.6 $ 651.6 Weighted average shares (in millions) 431.5 1.1 0.7 433.3 EPS $ 1.51 $ 1.50 Three Months Ended December 31, 2018 Net earnings $ 558.2 $ 558.2 Weighted average shares (in millions) 435.7 1.2 1.1 438.0 EPS $ 1.28 $ 1.27 Six Months Ended December 31, 2019 Net earnings $ 1,234.0 $ 1,234.0 Weighted average shares (in millions) 432.1 1.1 1.1 434.3 EPS $ 2.86 $ 2.84 Six Months Ended December 31, 2018 Net earnings $ 1,063.6 $ 1,063.6 Weighted average shares (in millions) 436.2 1.3 1.4 438.9 EPS $ 2.44 $ 2.42

Other Income, Net (Tables)

Other Income, Net (Tables)	6 Months Ended
	Dec. 31, 2019
Other Income and Expenses [Abstract]
Other Income, net	Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Interest income on corporate funds $ (25.7 ) $ (28.1 ) $ (58.0 ) $ (56.6 ) Realized gains on available-for-sale securities (7.6 ) (0.3 ) (10.1 ) (0.6 ) Realized losses on available-for-sale securities 0.5 0.8 0.7 2.0 Impairment of intangible assets — — — 12.1 Gain on sale of assets — (4.1 ) (1.9 ) (4.1 ) Gain on sale of investment (0.2 ) — (0.2 ) — Non-service components of pension expense, net (see Note 11) (13.0 ) (0.9 ) (31.1 ) 0.7 Other income, net $ (46.0 ) $ (32.6 ) $ (100.6 ) $ (46.5 )

Corporate Investments and Fun_2

Corporate Investments and Funds Held For Clients (Tables)	6 Months Ended
	Dec. 31, 2019
Corporate Investments And Funds Held For Clients [Abstract]
Available-for-sale Securities	Corporate investments and funds held for clients at December 31, 2019 and June 30, 2019 were as follows: December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Market Value (A) Type of issue: Money market securities, cash and other cash equivalents $ 13,315.1 $ — $ — $ 13,315.1 Available-for-sale securities: Corporate bonds 10,933.2 218.8 (2.9 ) 11,149.1 Asset-backed securities 4,205.2 37.6 (3.5 ) 4,239.3 U.S. Treasury securities 3,581.8 26.7 (3.8 ) 3,604.7 U.S. government agency securities 2,046.7 20.9 (1.3 ) 2,066.3 Canadian government obligations and Canadian government agency obligations 1,177.4 3.8 (6.2 ) 1,175.0 Canadian provincial bonds 723.1 10.9 (0.6 ) 733.4 Municipal bonds 586.9 19.0 (0.1 ) 605.8 Other securities 1,208.1 20.8 (1.4 ) 1,227.5 Total available-for-sale securities 24,462.4 358.5 (19.8 ) 24,801.1 Total corporate investments and funds held for clients $ 37,777.5 $ 358.5 $ (19.8 ) $ 38,116.2 (A) Included within available-for-sale securities are corporate investments with fair values of $7.2 million and funds held for clients with fair values of $24,793.9 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy. June 30, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Market Value (B) Type of issue: Money market securities, cash and other cash equivalents $ 6,796.2 $ — $ — $ 6,796.2 Available-for-sale securities: Corporate bonds 10,691.8 182.8 (6.7 ) 10,867.9 Asset-backed securities 4,658.3 37.8 (5.4 ) 4,690.7 U.S. Treasury securities 2,933.0 23.8 (8.0 ) 2,948.8 U.S. government agency securities 2,612.0 17.7 (5.8 ) 2,623.9 Canadian government obligations and Canadian government agency obligations 1,164.1 7.0 (6.0 ) 1,165.1 Canadian provincial bonds 800.2 14.5 (0.5 ) 814.2 Municipal bonds 596.1 16.4 (0.1 ) 612.4 Other securities 1,116.1 20.6 (0.6 ) 1,136.1 Total available-for-sale securities 24,571.6 320.6 (33.1 ) 24,859.1 Total corporate investments and funds held for clients $ 31,367.8 $ 320.6 $ (33.1 ) $ 31,655.3 (B) Included within available-for-sale securities are corporate investments with fair values of $271.9 million and funds held for clients with fair values of $24,587.2 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of December 31, 2019 , are as follows: December 31, 2019 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Value Gross Fair Market Value Gross Unrealized Losses Fair Market Value Corporate bonds $ (2.6 ) $ 715.4 $ (0.3 ) $ 260.3 $ (2.9 ) $ 975.7 Asset-backed securities (2.6 ) 593.2 (0.9 ) 628.8 (3.5 ) 1,222.0 U.S. Treasury securities (0.4 ) 257.5 (3.4 ) 1,005.0 (3.8 ) 1,262.5 U.S. government agency securities (0.7 ) 91.7 (0.6 ) 743.3 (1.3 ) 835.0 Canadian government obligations and Canadian government agency obligations (6.2 ) 870.1 — — (6.2 ) 870.1 Canadian provincial bonds (0.6 ) 113.8 — 30.5 (0.6 ) 144.3 Municipal bonds (0.1 ) 19.0 — 6.6 (0.1 ) 25.6 Other securities (1.1 ) 140.6 (0.3 ) 67.2 (1.4 ) 207.8 $ (14.3 ) $ 2,801.3 $ (5.5 ) $ 2,741.7 $ (19.8 ) $ 5,543.0 The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of June 30, 2019 , are as follows: June 30, 2019 Securities in Unrealized Loss Position Less Than 12 Months Securities in Unrealized Loss Position Greater Than 12 Months Total Gross Fair Market Value Gross Fair Market Value Gross Unrealized Losses Fair Market Value Corporate bonds $ (0.6 ) $ 151.9 $ (6.1 ) $ 2,055.6 $ (6.7 ) $ 2,207.5 Asset-backed securities (0.2 ) 171.9 (5.2 ) 2,083.5 (5.4 ) 2,255.4 U.S. Treasury securities — 1.8 (8.0 ) 1,159.4 (8.0 ) 1,161.2 U.S. government agency securities — — (5.8 ) 1,671.4 (5.8 ) 1,671.4 Canadian government obligations and Canadian government agency obligations (6.0 ) 662.7 — 1.1 (6.0 ) 663.8 Canadian provincial bonds (0.3 ) 81.5 (0.2 ) 50.1 (0.5 ) 131.6 Municipal bonds — 1.5 (0.1 ) 23.3 (0.1 ) 24.8 Other securities (0.1 ) 36.4 (0.5 ) 148.1 (0.6 ) 184.5 $ (7.2 ) $ 1,107.7 $ (25.9 ) $ 7,192.5 $ (33.1 ) $ 8,300.2
Classification Of Corporate Investments On The Consolidated Balance Sheets	Classification of corporate investments on the Consolidated Balance Sheets is as follows: December 31, June 30, 2019 2019 Corporate investments: Cash and cash equivalents $ 1,500.4 $ 1,949.2 Short-term marketable securities 7.2 10.5 Long-term marketable securities (a) — 261.4 Total corporate investments $ 1,507.6 $ 2,221.1 (a) - Long-term marketable securities are included within Other assets on the Consolidated Balance Sheets.
Schedule Of Investment Of Funds Held For Clients	Funds held for clients have been invested in the following categories: December 31, June 30, 2019 2019 Funds held for clients: Restricted cash and cash equivalents held to satisfy client funds obligations $ 11,814.7 $ 4,847.0 Restricted short-term marketable securities held to satisfy client funds obligations 5,241.3 5,013.9 Restricted long-term marketable securities held to satisfy client funds obligations 19,552.6 19,573.3 Total funds held for clients $ 36,608.6 $ 29,434.2
Expected Maturities Of Available-For-Sale Securities	Expected maturities of available-for-sale securities at December 31, 2019 are as follows: One year or less $ 5,248.5 One year to two years 5,107.8 Two years to three years 4,930.4 Three years to four years 3,740.3 After four years 5,774.1 Total available-for-sale securities $ 24,801.1

Leases (Tables)

Leases (Tables)	6 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of Lease Cost	The components of operating lease expense were as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2019 Operating lease cost $ 42.3 $ 86.5 Short-term lease cost 1.2 3.9 Variable lease cost 0.7 2.0 Total operating lease cost $ 44.2 $ 92.4
Schedule of Operating lease ROU assets and liabilities	Information related to our operating lease ROU assets and operating lease liabilities was as follows: December 31, 2019 Cash paid for operating lease liabilities $ 75.8 Operating lease ROU assets obtained in exchange for new operating lease liabilities $ 17.4 Weighted-average remaining lease term (in years) 6 Weighted-average discount rate 2.4 %
Schedule of Operating Lease Maturities	As of December 31, 2019 , maturities of operating lease liabilities are as follows: Six months ending June 30, 2020 $ 58.9 Twelve months ending June 30, 2021 102.4 Twelve months ending June 30, 2022 85.4 Twelve months ending June 30, 2023 73.1 Twelve months ending June 30, 2024 51.4 Thereafter 128.6 Total undiscounted lease obligations 499.8 Less: Imputed interest (35.1 ) Net lease obligations $ 464.7

Goodwill and Intangibles Assets

Goodwill and Intangibles Assets, net (Tables)	6 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Changes In Goodwill	Changes in goodwill for the six months ended December 31, 2019 are as follows: Employer Services PEO Services Total Balance at June 30, 2019 $ 2,318.2 $ 4.8 $ 2,323.0 Additions and other adjustments (2.5 ) — (2.5 ) Currency translation adjustments (5.6 ) — (5.6 ) Balance at December 31, 2019 $ 2,310.1 $ 4.8 $ 2,314.9
Components Of Finite-Lived Intangible Assets	Components of intangible assets, net, are as follows: December 31, June 30, 2019 2019 Intangible assets: Software and software licenses $ 2,617.6 $ 2,519.3 Customer contracts and lists 900.4 860.7 Other intangibles 238.9 237.9 3,756.9 3,617.9 Less accumulated amortization: Software and software licenses (1,840.3 ) (1,762.3 ) Customer contracts and lists (593.8 ) (566.4 ) Other intangibles (220.3 ) (217.7 ) (2,654.4 ) (2,546.4 ) Intangible assets, net $ 1,102.5 $ 1,071.5
Schedule Of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated future amortization expenses of the Company's existing intangible assets are as follows: Amount Six months ending June 30, 2020 $ 147.6 Twelve months ending June 30, 2021 $ 241.8 Twelve months ending June 30, 2022 $ 194.1 Twelve months ending June 30, 2023 $ 154.5 Twelve months ending June 30, 2024 $ 120.4 Twelve months ending June 30, 2025 $ 69.1

Short-term Financing (Tables)

Short-term Financing (Tables)	6 Months Ended
	Dec. 31, 2019
Short-Term Financing [Abstract]
Commercial Paper Program	Details of the borrowings under the commercial paper program are as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Average daily borrowings (in billions) $ 3.5 $ 3.8 $ 3.7 $ 3.8 Weighted average interest rates 1.7 % 2.3 % 2.0 % 2.1 % Weighted average maturity (approximately in days) 2 days 2 days 2 days 2 days
Reverse Repurchase Agreement	Details of the reverse repurchase agreements are as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Average outstanding balances $ 335.9 $ 325.4 $ 381.2 $ 410.2 Weighted average interest rates 1.7 % 1.9 % 1.8 % 1.8 %

Long-term Debt (Tables)

Long-term Debt (Tables)	6 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long Term Debt	The principal amounts and associated effective interest rates of the Notes and other debt as of December 31, 2019 and June 30, 2019 , are as follows: Debt instrument Effective Interest Rate December 31, 2019 June 30, 2019 Fixed-rate 2.25% notes due September 15, 2020 2.37% $ 1,000.0 $ 1,000.0 Fixed-rate 3.375% notes due September 15, 2025 3.47% 1,000.0 1,000.0 Other 8.9 10.9 2,008.9 2,010.9 Less: current portion (1,001.6 ) (2.5 ) Less: unamortized discount and debt issuance costs (4.3 ) (6.2 ) Total long-term debt $ 1,003.0 $ 2,002.2

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Components Of Stock-Based Compensation Expense	The following table represents pre-tax stock-based compensation expense for the three and six months ended December 31, 2019 and 2018 , respectively: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Operating expenses $ 3.4 $ 3.4 $ 7.4 $ 8.8 Selling, general and administrative expenses 28.0 30.4 56.3 58.4 System development and programming costs 4.8 4.8 9.6 9.8 Total stock-based compensation expense $ 36.2 $ 38.6 $ 73.3 $ 77.0
Schedule of Net Benefit Costs	The components of net pension expense were as follows: Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Service cost – benefits earned during the period $ 14.9 $ 14.9 $ 29.9 $ 29.9 Interest cost on projected benefits 15.4 19.7 30.9 39.3 Expected return on plan assets (29.5 ) (33.0 ) (59.0 ) (65.9 ) Net amortization and deferral 1.5 — 2.9 0.1 Settlement charges and special termination benefits — 12.8 (5.1 ) 28.1 Net pension expense $ 2.3 $ 14.4 $ (0.4 ) $ 31.5

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Dec. 31, 2019
Stockholders' Equity Attributable to Parent [Abstract]
Schedule of Components of Stockholders' Equity	Changes in stockholders' equity by component are as follows: Three Months Ended December 31, 2019 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at September 30, 2019 $ 63.9 $ 1,213.7 $ 17,729.6 $ (13,412.6 ) $ (233.9 ) $ 5,360.7 Net earnings — — 651.6 — — 651.6 Other comprehensive income — — — — 2.7 2.7 Stock-based compensation expense — 31.3 — — — 31.3 Issuances relating to stock compensation plans — 8.7 — 14.5 — 23.2 Treasury stock acquired (1.8 shares) — — — (311.5 ) — (311.5 ) Dividends declared ($0.91 per share) — — (393.6 ) — — (393.6 ) Balance at December 31, 2019 $ 63.9 $ 1,253.7 $ 17,987.6 $ (13,709.6 ) $ (231.2 ) $ 5,364.4 Three Months Ended December 31, 2018 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at September 30, 2018 $ 63.9 $ 1,035.1 $ 16,741.1 $ (12,421.2 ) $ (740.1 ) $ 4,678.8 Net earnings — — 558.2 — — 558.2 Other comprehensive income — — — — 125.1 125.1 Stock-based compensation expense — 35.0 — — — 35.0 Issuances relating to stock compensation plans — 6.0 — 13.3 — 19.3 Treasury stock acquired (2.2 shares) — — — (312.3 ) — (312.3 ) Dividends declared ($0.79 per share) — — (340.2 ) — — (340.2 ) Balance at December 31, 2018 $ 63.9 $ 1,076.1 $ 16,959.1 $ (12,720.2 ) $ (615.0 ) $ 4,763.9 Six Months Ended December 31, 2019 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2019 $ 63.9 $ 1,183.2 $ 17,500.6 $ (13,090.5 ) $ (257.3 ) $ 5,399.9 Net earnings — — 1,234.0 — — 1,234.0 Other comprehensive income — — — — 26.1 26.1 Stock-based compensation expense — 67.3 — — — 67.3 Issuances relating to stock compensation plans — 3.2 — 84.9 — 88.1 Treasury stock acquired (3.7 shares) — — — (704.0 ) — (704.0 ) Dividends declared ($1.70 per share) — — (740.2 ) — — (740.2 ) Other — — (6.8 ) — — (6.8 ) Balance at December 31, 2019 $ 63.9 $ 1,253.7 $ 17,987.6 $ (13,709.6 ) $ (231.2 ) $ 5,364.4 Six Months Ended December 31, 2018 Common Stock Capital in Excess of Par Value Retained Earnings Treasury Stock AOCI Total Balance at June 30, 2018 $ 63.9 $ 1,014.8 $ 16,546.6 $ (12,209.6 ) $ (679.8 ) $ 4,735.9 Net earnings — — 1,063.6 — — 1,063.6 Other comprehensive income — — — — 64.8 64.8 Stock-based compensation expense — 69.7 — — — 69.7 Issuances relating to stock compensation plans — (8.4 ) — 83.5 — 75.1 Treasury stock acquired (3.8 shares) — — — (594.1 ) — (594.1 ) Dividends declared ($1.48 per share) — — (651.1 ) — — (651.1 ) Balance at December 31, 2018 $ 63.9 $ 1,076.1 $ 16,959.1 $ (12,720.2 ) $ (615.0 ) $ 4,763.9

Reclassifications out of Accu_2

Reclassifications out of Accumulated Other Comprehensive Income (AOCI) (Tables)	6 Months Ended
	Dec. 31, 2019
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Reclassification out of Accumulated Other Comprehensive Income	Changes in AOCI by component are as follows: Three Months Ended December 31, 2019 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Other Accumulated Other Comprehensive Loss Balance at September 30, 2019 $ (318.1 ) $ 298.1 $ (213.9 ) $ — $ (233.9 ) Other comprehensive (loss)/income before reclassification adjustments 34.3 (35.5 ) — 0.7 (0.5 ) Tax effect — 7.5 — (0.2 ) 7.3 Reclassification adjustments to — (7.1 ) (A) 1.9 (B) — (5.2 ) Tax effect — 1.6 (0.5 ) — 1.1 Balance at December 31, 2019 $ (283.8 ) $ 264.6 $ (212.5 ) $ 0.5 $ (231.2 ) Three Months Ended December 31, 2018 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Accumulated Other Comprehensive Loss Balance at September 30, 2018 $ (249.9 ) $ (311.4 ) $ (178.8 ) $ (740.1 ) Other comprehensive (loss)/income before reclassification adjustments (24.7 ) 168.3 — 143.6 Tax effect — (38.8 ) — (38.8 ) Reclassification adjustments to net earnings — 0.5 (A) 26.2 (B) 26.7 Tax effect — (0.1 ) (6.3 ) (6.4 ) Balance at December 31, 2018 $ (274.6 ) $ (181.5 ) $ (158.9 ) $ (615.0 ) Six Months Ended December 31, 2019 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Other Accumulated Other Comprehensive Loss Balance at June 30, 2019 $ (269.2 ) $ 224.6 $ (212.7 ) $ — $ (257.3 ) Other comprehensive (loss)/income before reclassification adjustments (14.6 ) 60.6 — 0.7 46.7 Tax effect — (13.3 ) — (0.2 ) (13.5 ) Reclassification adjustments to net earnings — (9.4 ) (A) 0.2 (B) — (9.2 ) Tax effect — 2.1 — — 2.1 Balance at December 31, 2019 $ (283.8 ) $ 264.6 $ (212.5 ) $ 0.5 $ (231.2 ) Six Months Ended December 31, 2018 Currency Translation Adjustment Net Gains/Losses on Available-for-sale Securities Pension Liability Accumulated Other Comprehensive Loss Balance at June 30, 2018 $ (227.0 ) $ (274.0 ) $ (178.8 ) $ (679.8 ) Other comprehensive (loss)/income before reclassification adjustments (47.6 ) 118.0 — 70.4 Tax effect — (26.6 ) — (26.6 ) Reclassification adjustments to net earnings — 1.4 (A) 26.3 (B) 27.7 Tax effect — (0.3 ) (6.4 ) (6.7 ) Balance at December 31, 2018 $ (274.6 ) $ (181.5 ) $ (158.9 ) $ (615.0 ) (A) Reclassification adjustments out of AOCI are included within Other income, net, on the Statements of Consolidated Earnings. (B) Reclassification adjustments out of AOCI are included in net pension expense (see Note 11 ).

Interim Financial Data by Seg_2

Interim Financial Data by Segment (Tables)	6 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Segment Results: Revenues Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Employer Services $ 2,537.5 $ 2,450.4 $ 4,978.9 $ 4,788.6 PEO Services 1,134.7 1,044.7 2,191.5 2,019.6 Other (2.7 ) (2.7 ) (5.2 ) (5.5 ) $ 3,669.5 $ 3,492.4 $ 7,165.2 $ 6,802.7 Earnings before Income Taxes Three Months Ended Six Months Ended December 31, December 31, 2019 2018 2019 2018 Employer Services $ 767.4 $ 733.0 $ 1,448.4 $ 1,372.9 PEO Services 167.1 157.3 315.5 301.1 Other (99.0 ) (149.3 ) (189.3 ) (286.2 ) $ 835.5 $ 741.0 $ 1,574.6 $ 1,387.8

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
PEO revenues	[1]	$ 1,133.4	$ 1,043.5	$ 2,189	$ 2,017.3
TOTAL REVENUES		3,669.5	3,492.4	7,165.2	6,802.7
Operating expenses		1,836	1,772.4	3,623.6	3,469.5
Total Expenses		2,880	2,784	5,691.2	5,461.4
EARNINGS BEFORE INCOME TAXES		835.5	741	1,574.6	1,387.8
Provision for income taxes		183.9	182.8	340.6	324.2
NET EARNINGS		$ 651.6	558.2	$ 1,234	1,063.6
Revision
Error Corrections and Prior Period Adjustments Restatement [Line Items]
PEO revenues	[1]		(13.5)		(26.4)
TOTAL REVENUES			(13.5)		(26.4)
Operating expenses			(13.5)		(26.4)
Total Expenses			(13.5)		(26.4)
EARNINGS BEFORE INCOME TAXES			0		0
Provision for income taxes			0		0
NET EARNINGS			0		0
As reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
PEO revenues	[1]		1,057		2,043.7
TOTAL REVENUES			3,505.9		6,829.1
Operating expenses			1,785.9		3,495.9
Total Expenses			2,797.5		5,487.8
EARNINGS BEFORE INCOME TAXES			741		1,387.8
Provision for income taxes			182.8		324.2
NET EARNINGS			$ 558.2		$ 1,063.6
[1]	Professional Employer Organization (“PEO”) revenues are net of direct pass-through costs, primarily consisting of payroll wages and payroll taxes of $12,371.6 million and $11,751.1 million for the three months ended December 31, 2019 and 2018 , respectively, and $22,882.2 million and $21,380.5 million for the six months ended December 31, 2019 and 2018

New Accounting Pronouncements_2

New Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jul. 01, 2019	Jun. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Operating lease right-of-use asset	$ 500.2	$ 573.3	$ 0
Operating lease liabilities	$ 360.2	$ 522.6	$ 0

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 3,669.5	$ 3,492.4	$ 7,165.2	$ 6,802.7
Employer Services
Disaggregation of Revenue [Line Items]
Revenues	2,537.5	2,450.4	4,978.9	4,788.6
PEO
Disaggregation of Revenue [Line Items]
Revenues	1,134.7	1,044.7	2,191.5	2,019.6
Other
Disaggregation of Revenue [Line Items]
Revenues	(2.7)	(2.7)	(5.2)	(5.5)
HCM
Disaggregation of Revenue [Line Items]
Revenues	1,647.9	1,599.4	3,216.5	3,114.7
HCM | Employer Services
Disaggregation of Revenue [Line Items]
Revenues	1,649.8	1,599.6	3,219.8	3,116.4
HCM | PEO
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
HCM | Other
Disaggregation of Revenue [Line Items]
Revenues	(1.9)	(0.2)	(3.3)	(1.7)
HRO, excluding PEO zero-margin benefits pass-throughs
Disaggregation of Revenue [Line Items]
Revenues	650.1	614.2	1,241.2	1,176.7
HRO, excluding PEO zero-margin benefits pass-throughs | Employer Services
Disaggregation of Revenue [Line Items]
Revenues	239.9	232.9	475.6	463.4
HRO, excluding PEO zero-margin benefits pass-throughs | PEO
Disaggregation of Revenue [Line Items]
Revenues	411	383.8	767.5	717.1
HRO, excluding PEO zero-margin benefits pass-throughs | Other
Disaggregation of Revenue [Line Items]
Revenues	(0.8)	(2.5)	(1.9)	(3.8)
PEO zero-margin benefits pass-throughs
Disaggregation of Revenue [Line Items]
Revenues	722.4	659.7	1,421.5	1,300.2
PEO zero-margin benefits pass-throughs | Employer Services
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
PEO zero-margin benefits pass-throughs | PEO
Disaggregation of Revenue [Line Items]
Revenues	722.4	659.7	1,421.5	1,300.2
PEO zero-margin benefits pass-throughs | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Global
Disaggregation of Revenue [Line Items]
Revenues	511.4	490	1,014.5	963.5
Global | Employer Services
Disaggregation of Revenue [Line Items]
Revenues	511.4	490	1,014.5	963.5
Global | PEO
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Global | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Interest on funds held for clients
Disaggregation of Revenue [Line Items]
Revenues	137.7	129.1	271.5	247.6
Interest on funds held for clients | Employer Services
Disaggregation of Revenue [Line Items]
Revenues	136.4	127.9	269	245.3
Interest on funds held for clients | PEO
Disaggregation of Revenue [Line Items]
Revenues	1.3	1.2	2.5	2.3
Interest on funds held for clients | Other
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

Revenue - Contract Liability (D

Revenue - Contract Liability (Details) $ in Millions	6 Months Ended
	Dec. 31, 2019USD ($)
Change In Contract With Customer, Liability [Roll Forward]
Contract liability, July 1, 2019	$ 563.4
Recognition of revenue included in beginning of year contract liability	(88.7)
Contract liability, net of revenue recognized on contracts during the period	66.1
Currency adjustments	(4)
Contract liability, December 31, 2019	$ 536.8

Earnings per Share (EPS) (Detai

Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net earnings	$ 651.6	$ 558.2	$ 1,234	$ 1,063.6
Basic weighted average shares outstanding (shares)	431.5	435.7	432.1	436.2
Effect of employee stock option shares (shares)	1.1	1.2	1.1	1.3
Effect of employee restricted stock shares (shares)	0.7	1.1	1.1	1.4
Diluted weighted average shares outstanding (shares)	433.3	438	434.3	438.9
Basic EPS from continuing operations (in US$ per share)	$ 1.51	$ 1.28	$ 2.86	$ 2.44
Diluted EPS from continuing operations (in US$ per share)	$ 1.50	$ 1.27	$ 2.84	$ 2.42
Options excluded from the calculation of diluted earnings per share (shares)	1.3	0.8	1	0.6

Other Income, Net (Details)

Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Interest income on corporate funds	$ (25.7)	$ (28.1)	$ (58)	$ (56.6)
Realized gains on available-for-sale securities	(7.6)	(0.3)	(10.1)	(0.6)
Realized losses on available-for-sale securities	0.5	0.8	0.7	2
Impairment of intangible assets	0	0	0	12.1
Gain on sale of assets	0	(4.1)	(1.9)	(4.1)
Gain on sale of investment	(0.2)	0	(0.2)	0
Non-service components of pension expense, net	(13)	(0.9)	(31.1)	0.7
Other income, net	$ (46)	$ (32.6)	$ (100.6)	$ (46.5)

Other Income, Net - Narrative (

Other Income, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Impairment of intangible assets	$ 0	$ 0	$ 0	$ 12.1
Gain on sale of assets	$ 0	$ (4.1)	$ (1.9)	$ (4.1)

Corporate Investments and Fun_3

Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($) $ in Millions	Dec. 31, 2019		Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Money market securities and other cash equivalents - amortized cost	$ 13,315.1		$ 6,796.2
Money market securities and other cash equivalents - gross unrealized gains	0		0
Money market securities and other cash equivalents - gross unrealized losses	0		0
Money market securities and other cash equivalents - fair market value	13,315.1		6,796.2
Amortized Cost	24,462.4		24,571.6
Gross Unrealized Gains	358.5		320.6
Gross Unrealized Losses	(19.8)		(33.1)
Fair market value	24,801.1	[1]	24,859.1	[2]
Total corporate investments and funds held for clients - amortized cost	37,777.5		31,367.8
Total corporate investments and funds held for clients - gross unrealized gains	358.5		320.6
Total corporate investments and funds held for clients - gross unrealized losses	(19.8)		(33.1)
Total corporate investments and funds held for clients - fair market value	38,116.2		31,655.3
Corporate Investments
Debt Securities, Available-for-sale [Line Items]
Fair market value	7.2		271.9
Funds Held For Clients
Debt Securities, Available-for-sale [Line Items]
Fair market value	24,793.9		24,587.2
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,933.2		10,691.8
Gross Unrealized Gains	218.8		182.8
Gross Unrealized Losses	(2.9)		(6.7)
Fair market value	11,149.1		10,867.9
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,205.2		4,658.3
Gross Unrealized Gains	37.6		37.8
Gross Unrealized Losses	(3.5)		(5.4)
Fair market value	4,239.3		4,690.7
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,046.7		2,612
Gross Unrealized Gains	20.9		17.7
Gross Unrealized Losses	(1.3)		(5.8)
Fair market value	2,066.3		2,623.9
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,581.8		2,933
Gross Unrealized Gains	26.7		23.8
Gross Unrealized Losses	(3.8)		(8)
Fair market value	3,604.7		2,948.8
Canadian government obligations and Canadian government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,177.4		1,164.1
Gross Unrealized Gains	3.8		7
Gross Unrealized Losses	(6.2)		(6)
Fair market value	1,175		1,165.1
Canadian provincial bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	723.1		800.2
Gross Unrealized Gains	10.9		14.5
Gross Unrealized Losses	(0.6)		(0.5)
Fair market value	733.4		814.2
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	586.9		596.1
Gross Unrealized Gains	19		16.4
Gross Unrealized Losses	(0.1)		(0.1)
Fair market value	605.8		612.4
Other securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,208.1		1,116.1
Gross Unrealized Gains	20.8		20.6
Gross Unrealized Losses	(1.4)		(0.6)
Fair market value	$ 1,227.5		$ 1,136.1
[1]	Included within available-for-sale securities are corporate investments with fair values of $7.2 million and funds held for clients with fair values of $24,793.9 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy.
[2]	Included within available-for-sale securities are corporate investments with fair values of $271.9 million and funds held for clients with fair values of $24,587.2 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy.

Corporate Investments and Fun_4

Corporate Investments and Funds Held For Clients (Available-For-Sale Securities That Have Been In An Unrealized Loss Position) (Details) - USD ($) $ in Millions	Dec. 31, 2019		Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	$ (14.3)		$ (7.2)
Fair market value of securities in unrealized loss position less than 12 months	2,801.3		1,107.7
Unrealized losses greater than 12 months	(5.5)		(25.9)
Fair market value of securities in unrealized loss positions greater than 12 months	2,741.7		7,192.5
Total gross unrealized losses	(19.8)		(33.1)
Total fair market value	5,543		8,300.2
Fair market value	24,801.1	[1]	24,859.1	[2]
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(2.6)		(0.6)
Fair market value of securities in unrealized loss position less than 12 months	715.4		151.9
Unrealized losses greater than 12 months	(0.3)		(6.1)
Fair market value of securities in unrealized loss positions greater than 12 months	260.3		2,055.6
Total gross unrealized losses	(2.9)		(6.7)
Total fair market value	975.7		2,207.5
Fair market value	11,149.1		10,867.9
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(2.6)		(0.2)
Fair market value of securities in unrealized loss position less than 12 months	593.2		171.9
Unrealized losses greater than 12 months	(0.9)		(5.2)
Fair market value of securities in unrealized loss positions greater than 12 months	628.8		2,083.5
Total gross unrealized losses	(3.5)		(5.4)
Total fair market value	1,222		2,255.4
Fair market value	4,239.3		4,690.7
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(0.4)		0
Fair market value of securities in unrealized loss position less than 12 months	257.5		1.8
Unrealized losses greater than 12 months	(3.4)		(8)
Fair market value of securities in unrealized loss positions greater than 12 months	1,005		1,159.4
Total gross unrealized losses	(3.8)		(8)
Total fair market value	1,262.5		1,161.2
Fair market value	3,604.7		2,948.8
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(0.7)		0
Fair market value of securities in unrealized loss position less than 12 months	91.7		0
Unrealized losses greater than 12 months	(0.6)		(5.8)
Fair market value of securities in unrealized loss positions greater than 12 months	743.3		1,671.4
Total gross unrealized losses	(1.3)		(5.8)
Total fair market value	835		1,671.4
Fair market value	2,066.3		2,623.9
Canadian government obligations and Canadian government agency obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(6.2)		(6)
Fair market value of securities in unrealized loss position less than 12 months	870.1		662.7
Unrealized losses greater than 12 months	0		0
Fair market value of securities in unrealized loss positions greater than 12 months	0		1.1
Total gross unrealized losses	(6.2)		(6)
Total fair market value	870.1		663.8
Fair market value	1,175		1,165.1
Canadian provincial bonds
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(0.6)		(0.3)
Fair market value of securities in unrealized loss position less than 12 months	113.8		81.5
Unrealized losses greater than 12 months	0		(0.2)
Fair market value of securities in unrealized loss positions greater than 12 months	30.5		50.1
Total gross unrealized losses	(0.6)		(0.5)
Total fair market value	144.3		131.6
Fair market value	733.4		814.2
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(0.1)		0
Fair market value of securities in unrealized loss position less than 12 months	19		1.5
Unrealized losses greater than 12 months	0		(0.1)
Fair market value of securities in unrealized loss positions greater than 12 months	6.6		23.3
Total gross unrealized losses	(0.1)		(0.1)
Total fair market value	25.6		24.8
Fair market value	605.8		612.4
Other securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses less than 12 months	(1.1)		(0.1)
Fair market value of securities in unrealized loss position less than 12 months	140.6		36.4
Unrealized losses greater than 12 months	(0.3)		(0.5)
Fair market value of securities in unrealized loss positions greater than 12 months	67.2		148.1
Total gross unrealized losses	(1.4)		(0.6)
Total fair market value	207.8		184.5
Fair market value	1,227.5		1,136.1
Fair Value, Inputs, Level 1
Debt Securities, Available-for-sale [Line Items]
Fair market value	0		0
Fair Value, Inputs, Level 3
Debt Securities, Available-for-sale [Line Items]
Fair market value	$ 0		$ 0
[1]	Included within available-for-sale securities are corporate investments with fair values of $7.2 million and funds held for clients with fair values of $24,793.9 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy.
[2]	Included within available-for-sale securities are corporate investments with fair values of $271.9 million and funds held for clients with fair values of $24,587.2 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy.

Corporate Investments and Fun_5

Corporate Investments and Funds Held For Clients (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019		Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Earliest Corporate bond debt maturity date	January 2020
Latest corporate debt maturity date	November 2029
Fair market value	$ 24,801.1	[1]	$ 24,859.1	[2]
Earliest U.S. treasury maturity date	January 2020
Latest U.S treasury maturity date	December 2029
Client fund obligation repayment period	1 year
Client funds obligations	$ 36,269.9		29,144.5
Client funds held in grantor trust	$ 33,001.5		$ 26,648
Client funds investments with original maturities	ninety days or less
Percentage of the available-for-sale securities were rated AAA Or AA	78.00%
Federal Home Loan Banks
Debt Securities, Available-for-sale [Line Items]
Fair market value	$ 1,150
Federal Farm Credit Banks
Debt Securities, Available-for-sale [Line Items]
Fair market value	715.6
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Fair market value	90.6
Fixed Rate Credit Card
Debt Securities, Available-for-sale [Line Items]
Fair market value	1,597.4
Asset-Backed Auto Loan Receivables
Debt Securities, Available-for-sale [Line Items]
Fair market value	2,101.3
Asset-Backed Equipment Lease Receivable
Debt Securities, Available-for-sale [Line Items]
Fair market value	418.8
Rate Reduction
Debt Securities, Available-for-sale [Line Items]
Fair market value	121.8
Supranational Bonds
Debt Securities, Available-for-sale [Line Items]
Fair market value	201.9
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fair market value	$ 739.3
[1]	Included within available-for-sale securities are corporate investments with fair values of $7.2 million and funds held for clients with fair values of $24,793.9 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy.
[2]	Included within available-for-sale securities are corporate investments with fair values of $271.9 million and funds held for clients with fair values of $24,587.2 million . All available-for-sale securities were included in Level 2 of the fair value hierarchy.

Corporate Investments and Fun_6

Corporate Investments and Funds Held For Clients (Classification Of Corporate Investments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Corporate Investments And Funds Held For Clients [Abstract]
Cash and cash equivalents		$ 1,500.4	$ 1,949.2	$ 2,785.6
Short-term marketable securities		7.2	10.5
Long-term marketable securities	[1]	0	261.4
Total corporate investments		$ 1,507.6	$ 2,221.1
[1]	(a) - Long-term marketable securities are included within Other assets on the Consolidated Balance Sheets.

Corporate Investments and Fun_7

Corporate Investments and Funds Held For Clients (Schedule Of Investment Of Funds Held For Clients) (Details) - USD ($) $ in Millions	Dec. 31, 2019		Jun. 30, 2019	Dec. 31, 2018	[1]
Debt Securities, Available-for-sale [Line Items]
Restricted cash and cash equivalents held to satisfy client funds obligations	$ 11,814.7	[1]	$ 4,847	$ 2,698.4
Total funds held for clients	36,608.6		29,434.2
Current
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, restricted	5,241.3		5,013.9
Non-current
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, restricted	$ 19,552.6		$ 19,573.3
[1]	See Note 6 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.

Corporate Investments and Fun_8

Corporate Investments and Funds Held For Clients (Expected Maturities Of Available-For-Sale Securities) (Details) $ in Millions	Dec. 31, 2019USD ($)
Corporate Investments And Funds Held For Clients [Abstract]
One year or less	$ 5,248.5
One year to two years	5,107.8
Two years to three years	4,930.4
Three years to four years	3,740.3
After four years	5,774.1
Total available-for-sale securities	$ 24,801.1

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jul. 01, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease, contract term	10 years
Operating lease right-of-use asset	$ 500.2	$ 573.3	$ 0
Operating lease liability, current	104.5
Operating lease liabilities	$ 360.2	$ 522.6	$ 0

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Cost	$ 42.3	$ 86.5
Short-term lease cost	1.2	3.9
Variable lease cost	0.7	2
Operating lease cost	$ 44.2	$ 92.4

Leases - Right of Use Assets an

Leases - Right of Use Assets and Operating Lease Liabilities (Details) $ in Millions	6 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Cash paid for operating lease liabilities	$ 75.8
Operating lease ROU assets obtained in exchange for new operating lease liabilities	$ 17.4
Weighted-average remaining lease term (in years)	6 years
Weighted-average discount rate	2.40%

Leases - Operating Lease Maturi

Leases - Operating Lease Maturities (Details) $ in Millions	Dec. 31, 2019USD ($)
Leases [Abstract]
Six months ending June 30, 2020	$ 58.9
Twelve months ending June 30, 2021	102.4
Twelve months ending June 30, 2022	85.4
Twelve months ending June 30, 2023	73.1
Twelve months ending June 30, 2024	51.4
Thereafter	128.6
Total undiscounted lease obligations	499.8
Less: Imputed interest	(35.1)
Net lease obligations	$ 464.7

Goodwill and Intangibles Asse_2

Goodwill and Intangibles Assets, net - Changes In Goodwill (Details) $ in Millions	6 Months Ended
	Dec. 31, 2019USD ($)
Goodwill [Roll Forward]
Balance at June 30, 2019	$ 2,323
Additions and other adjustments	(2.5)
Currency translation adjustments	(5.6)
Balance at December 31, 2019	2,314.9
Employer Services
Goodwill [Roll Forward]
Balance at June 30, 2019	2,318.2
Additions and other adjustments	(2.5)
Currency translation adjustments	(5.6)
Balance at December 31, 2019	2,310.1
PEO Services
Goodwill [Roll Forward]
Balance at June 30, 2019	4.8
Additions and other adjustments	0
Currency translation adjustments	0
Balance at December 31, 2019	$ 4.8

Goodwill and Intangibles Asse_3

Goodwill and Intangibles Assets, net - Components Of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Total - gross	$ 3,756.9	$ 3,617.9
Total - accumulated amortization	(2,654.4)	(2,546.4)
Intangible assets, net	1,102.5	1,071.5
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Total - gross	2,617.6	2,519.3
Total - accumulated amortization	(1,840.3)	(1,762.3)
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Total - gross	900.4	860.7
Total - accumulated amortization	(593.8)	(566.4)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Total - gross	238.9	237.9
Total - accumulated amortization	$ (220.3)	$ (217.7)

Goodwill and Intangibles Asse_4

Goodwill and Intangibles Assets, net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Useful life			6 years
Amortization of intangible assets	$ 69.7	$ 55.4	$ 139.1	$ 108.8
Software and software licenses
Finite-Lived Intangible Assets [Line Items]
Useful life			6 years
Customer contracts and lists
Finite-Lived Intangible Assets [Line Items]
Useful life			6 years
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Useful life			4 years

Goodwill and Intangibles Asse_5

Goodwill and Intangibles Assets, net - Schedule Of Finite-Lived Intangible Assets, Future Amortization Expense (Details) $ in Millions	Dec. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Six months ending June 30, 2020	$ 147.6
Twelve months ending June 30, 2021	241.8
Twelve months ending June 30, 2022	194.1
Twelve months ending June 30, 2023	154.5
Twelve months ending June 30, 2024	120.4
Twelve months ending June 30, 2025	$ 69.1

Short-term Financing (Details)

Short-term Financing (Details) - USD ($)		3 Months Ended		6 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Short-term Debt [Line Items]
Short-term debt		$ 0		$ 0
Commercial paper		0		0
Obligations under reverse repurchase agreements	[1]	0		$ 0		$ 262,000,000
Maturities of short-term funding agreements				overnight to up to five business days
364-day credit agreement
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		3,800,000,000		$ 3,800,000,000
Term of credit agreement				364 days
Expiration date of credit facilities				Jun. 30, 2020
Extension option term				1 year
Credit Facility Expiring In June 2024
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		2,750,000,000		$ 2,750,000,000
Term of credit agreement				5 years
Expiration date of credit facilities				Jun. 30, 2024
Line of credit facility potentially available increase in maximum borrowing capacity				$ 500,000,000
Credit Facility Expiring In June 2023
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		3,750,000,000		$ 3,750,000,000
Term of credit agreement				5 years
Expiration date of credit facilities				Jun. 30, 2023
Line of credit facility potentially available increase in maximum borrowing capacity				$ 500,000,000
Commercial paper program
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		10,300,000,000		$ 10,300,000,000
Maturities of commercial paper range				overnight to up to 364 days
Short-term debt, average outstanding amount		$ 3,500,000,000	$ 3,800,000,000	$ 3,700,000,000	$ 3,800,000,000
Debt instrument, interest rate during period		1.70%	2.30%	2.00%	2.10%
Short Term Commercial Paper Program
Short-term Debt [Line Items]
Commercial paper weighted average maturity		2 days	2 days	2 days	2 days
Reverse repurchase agreements
Short-term Debt [Line Items]
Short-term debt, average outstanding amount		$ 335,900,000	$ 325,400,000	$ 381,200,000	$ 410,200,000
Debt instrument, interest rate during period		1.70%	1.90%	1.80%	1.80%
[1]	(A) As of June 30, 2019, $261.4 million of long-term marketable securities and $0.6 million

Long-term Debt (Details)

Long-term Debt (Details) - USD ($)	6 Months Ended
	Dec. 31, 2019	Jun. 30, 2019
Debt Instrument [Line Items]
Aggregate principal amount	$ 2,000,000,000
Notes payable	2,008,900,000	$ 2,010,900,000
Less: current portion	(1,001,600,000)	(2,500,000)
Less: unamortized discount and debt issuance costs	(4,300,000)	(6,200,000)
Total long-term debt	1,003,000,000	2,002,200,000
Fair value of notes issued	$ 2,068,900,000
Fixed-rate 2.25% notes due September 15, 2020
Debt Instrument [Line Items]
Debt instrument, term	5 years
Debt instrument effective rate (percent)	2.37%
Notes payable	$ 1,000,000,000	1,000,000,000
Interest Rate	2.25%
Due Date	Sep. 15, 2020
Fixed-rate 3.375% notes due September 15, 2025
Debt Instrument [Line Items]
Debt instrument, term	10 years
Debt instrument effective rate (percent)	3.47%
Notes payable	$ 1,000,000,000	1,000,000,000
Interest Rate	3.375%
Due Date	Sep. 15, 2025
Other
Debt Instrument [Line Items]
Notes payable	$ 8,900,000	$ 10,900,000

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Nov. 12, 2019	Aug. 28, 2015
Defined Benefit Plan Disclosure [Line Items]
Stock repurchase program, authorized amount					$ 5,000
Stock repurchase program, shares authorized (in shares)						25
Treasury stock acquired (shares)	1.8	2.2	3.7	3.8
Treasury stock acquired, value	$ 311.5	$ 312.3	$ 704	$ 594.1
Defined benefit plan, benefit obligation, payment for settlement	0	$ (12.8)	$ 5.1	$ (28.1)
November 2019 Authorization
Defined Benefit Plan Disclosure [Line Items]
Treasury stock acquired, value	$ 155.4

Employee Benefit Plans (Compone

Employee Benefit Plans (Components Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 36.2	$ 38.6	$ 73.3	$ 77
Operating expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	3.4	3.4	7.4	8.8
Selling, general and administrative expenses
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	28	30.4	56.3	58.4
System development and programming costs
Defined Benefit Plan Disclosure [Line Items]
Total pre-tax stock-based compensation expense	$ 4.8	$ 4.8	$ 9.6	$ 9.8

Employee Benefit Plans (Compo_2

Employee Benefit Plans (Components Of Net Pension Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Service cost – benefits earned during the period	$ 14.9	$ 14.9	$ 29.9	$ 29.9
Interest cost on projected benefits	15.4	19.7	30.9	39.3
Expected return on plan assets	(29.5)	(33)	(59)	(65.9)
Net amortization and deferral	1.5	0	2.9	0.1
Settlement charges and special termination benefits	0	12.8	(5.1)	28.1
Net pension expense	$ 2.3	$ 14.4	$ (0.4)	$ 31.5

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	22.00%	24.70%	21.60%	23.40%

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,360.7	$ 4,678.8	$ 5,399.9	$ 4,735.9
Net earnings	651.6	558.2	1,234	1,063.6
Other comprehensive income	2.7	125.1	26.1	64.8
Stock-based compensation expense	31.3	35	67.3	69.7
Issuances relating to stock compensation plans	23.2	19.3	88.1	75.1
Treasury stock acquired	$ (311.5)	$ (312.3)	$ (704)	$ (594.1)
Treasury stock acquired (shares)	1.8	2.2	3.7	3.8
Dividends declared (in US$ per share)	$ 0.91	$ 0.79	$ 1.70	$ 1.48
Dividends declared	$ (393.6)	$ (340.2)	$ (740.2)	$ (651.1)
Other			(6.8)
Ending balance	5,364.4	4,763.9	5,364.4	4,763.9
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	63.9	63.9	63.9	63.9
Net earnings	0	0	0	0
Other comprehensive income	0	0	0	0
Stock-based compensation expense	0	0	0	0
Issuances relating to stock compensation plans	0	0	0	0
Treasury stock acquired	0	0	0	0
Dividends declared	0	0	0	0
Other			0
Ending balance	63.9	63.9	63.9	63.9
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,213.7	1,035.1	1,183.2	1,014.8
Net earnings	0	0	0	0
Other comprehensive income	0	0	0	0
Stock-based compensation expense	31.3	35	67.3	69.7
Issuances relating to stock compensation plans	8.7	6	3.2	(8.4)
Treasury stock acquired	0	0	0	0
Dividends declared	0	0	0	0
Other			0
Ending balance	1,253.7	1,076.1	1,253.7	1,076.1
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	17,729.6	16,741.1	17,500.6	16,546.6
Net earnings	651.6	558.2	1,234	1,063.6
Other comprehensive income	0	0	0	0
Stock-based compensation expense	0	0	0	0
Issuances relating to stock compensation plans	0	0	0	0
Treasury stock acquired	0	0	0	0
Dividends declared	(393.6)	(340.2)	(740.2)	(651.1)
Other			(6.8)
Ending balance	17,987.6	16,959.1	17,987.6	16,959.1
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(13,412.6)	(12,421.2)	(13,090.5)	(12,209.6)
Net earnings	0	0	0	0
Other comprehensive income	0	0	0	0
Stock-based compensation expense	0	0	0	0
Issuances relating to stock compensation plans	14.5	13.3	84.9	83.5
Treasury stock acquired	(311.5)	(312.3)	(704)	(594.1)
Dividends declared	0	0	0	0
Other			0
Ending balance	(13,709.6)	(12,720.2)	(13,709.6)	(12,720.2)
AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(233.9)	(740.1)	(257.3)	(679.8)
Net earnings	0	0	0	0
Other comprehensive income	2.7	125.1	26.1	64.8
Stock-based compensation expense	0	0	0	0
Issuances relating to stock compensation plans	0	0	0	0
Treasury stock acquired	0	0	0	0
Dividends declared	0	0	0	0
Other			0
Ending balance	$ (231.2)	$ (615)	$ (231.2)	$ (615)

Reclassifications out of Accu_3

Reclassifications out of Accumulated Other Comprehensive Income (AOCI) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		$ (233.9)	$ (740.1)	$ (257.3)	$ (679.8)
Other comprehensive (loss)/income before reclassification adjustments		(0.5)	143.6	46.7	70.4
Tax effect		7.3	(38.8)	(13.5)	(26.6)
Reclassification adjustments to net earnings		(5.2)	26.7	(9.2)	27.7
Tax effect		1.1	(6.4)	2.1	(6.7)
Accumulated other comprehensive income, ending balance		(231.2)	(615)	(231.2)	(615)
Currency Translation Adjustment
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		(318.1)	(249.9)	(269.2)	(227)
Other comprehensive (loss)/income before reclassification adjustments		34.3	(24.7)	(14.6)	(47.6)
Tax effect		0	0	0	0
Reclassification adjustments to net earnings		0	0	0	0
Tax effect		0	0	0	0
Accumulated other comprehensive income, ending balance		(283.8)	(274.6)	(283.8)	(274.6)
Net Gains/Losses on Available-for-sale Securities
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		298.1	(311.4)	224.6	(274)
Other comprehensive (loss)/income before reclassification adjustments		(35.5)	168.3	60.6	118
Tax effect		7.5	(38.8)	(13.3)	(26.6)
Reclassification adjustments to net earnings	[1]	(7.1)	0.5	(9.4)	1.4
Tax effect		1.6	(0.1)	2.1	(0.3)
Accumulated other comprehensive income, ending balance		264.6	(181.5)	264.6	(181.5)
Pension Liability
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		(213.9)	(178.8)	(212.7)	(178.8)
Other comprehensive (loss)/income before reclassification adjustments		0	0	0	0
Tax effect		0	0	0	0
Reclassification adjustments to net earnings	[2]	1.9	26.2	0.2	26.3
Tax effect		(0.5)	(6.3)	0	(6.4)
Accumulated other comprehensive income, ending balance		(212.5)	$ (158.9)	(212.5)	$ (158.9)
Other
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		0		0
Other comprehensive (loss)/income before reclassification adjustments		0.7		0.7
Tax effect		(0.2)		(0.2)
Reclassification adjustments to net earnings	[2]	0		0
Tax effect		0		0
Accumulated other comprehensive income, ending balance		$ 0.5		$ 0.5
[1]	(A) Reclassification adjustments out of AOCI are included within Other income, net, on the Statements of Consolidated Earnings.
[2]	(B) Reclassification adjustments out of AOCI are included in net pension expense (see Note 11 ).

Interim Financial Data by Seg_3

Interim Financial Data by Segment (Narrative) (Details)	6 Months Ended
	Dec. 31, 2019segment
Segment Reporting [Abstract]
Number of reportable segments	2

Interim Financial Data by Seg_4

Interim Financial Data by Segment (Financial Data By Strategic Business Unit Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ (3,669.5)	$ (3,492.4)	$ (7,165.2)	$ (6,802.7)
Earnings before Income Taxes	835.5	741	1,574.6	1,387.8
Employer Services
Segment Reporting Information [Line Items]
Revenues	(2,537.5)	(2,450.4)	(4,978.9)	(4,788.6)
Earnings before Income Taxes	767.4	733	1,448.4	1,372.9
PEO Services
Segment Reporting Information [Line Items]
Revenues	(1,134.7)	(1,044.7)	(2,191.5)	(2,019.6)
Earnings before Income Taxes	167.1	157.3	315.5	301.1
Other
Segment Reporting Information [Line Items]
Revenues	(2.7)	(2.7)	(5.2)	(5.5)
Earnings before Income Taxes	$ (99)	$ (149.3)	$ (189.3)	$ (286.2)