Statements Of Consolidated Cash Flows - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities:
Net earnings		$ 2,598.5	$ 2,466.5	$ 2,292.8
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization		510.7	480.0	409.0
Amortization of deferred contract costs		935.3	915.0	874.0
Deferred income taxes		(251.1)	26.0	9.3
Stock-based compensation expense		175.3	130.8	167.3
Net pension (income)/expense		(52.8)	(11.6)	55.4
Net amortization of premiums and accretion of discounts on available-for-sale securities		69.5	50.2	50.1
Impairment of assets		19.9	29.9	12.1
Gain on sale of assets		(9.8)	(6.0)	(19.8)
Other		35.2	65.4	43.9
Changes in operating assets and liabilities:
Increase in accounts receivable		(339.8)	(113.8)	(473.9)
Increase in other assets		(1,029.4)	(910.4)	(987.2)
Increase/(Decrease) in accounts payable		36.9	(18.3)	(10.7)
Increase/(Decrease) in accrued expenses and other liabilities		394.9	(77.5)	266.0
Net cash flows provided by operating activities		3,093.3	3,026.2	2,688.3
Cash Flows from Investing Activities:
Purchases of corporate and client funds marketable securities		(9,266.3)	(3,905.1)	(4,422.6)
Proceeds from the sales and maturities of corporate and client funds marketable securities		6,238.4	7,648.4	2,909.0
Capital expenditures		(178.6)	(172.7)	(162.0)
Additions to intangibles		(327.3)	(443.7)	(404.5)
Acquisitions of businesses, net of cash acquired		0.0	0.0	(125.5)
Proceeds from the sale of property, plant, and equipment and other assets		18.8	29.4	7.9
Net cash flows (used in)/provided by investing activities		(3,515.0)	3,156.3	(2,197.7)
Cash Flows from Financing Activities:
Net increase /(decrease) in client funds obligations		8,336.2	(3,213.2)	1,696.0
Payments of debt		(1,001.8)	(2.2)	(2.1)
Proceeds from the issuance of debt		1,981.5	0.0	0.0
Settlement of cash flow hedges		(44.6)	0.0	0.0
Repurchases of common stock		(1,372.3)	(1,006.3)	(937.7)
Net proceeds from stock purchase plan and stock-based compensation plans		104.1	50.0	72.9
Dividends paid		(1,575.5)	(1,470.5)	(1,293.0)
Net proceeds/(payments) related to reverse repurchase agreements		9.9	(248.4)	262.0
Other		0.0	0.0	(5.8)
Net cash flows provided by/(used in) financing activities		6,437.5	(5,890.6)	(207.7)
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents		73.8	(34.5)	(28.8)
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents		6,089.6	257.4	254.1
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year		7,053.6	6,796.2	6,542.1
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year		13,143.2	7,053.6	6,796.2
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents to the Consolidated Balance Sheets
Cash and cash equivalents		2,575.2	1,908.5	1,949.2
Restricted cash and restricted cash equivalents included in funds held for clients	[1]	10,568.0	5,145.1	4,847.0
Total cash, cash equivalents, restricted cash, and restricted cash equivalents		13,143.2	7,053.6	6,796.2
Supplemental disclosures of cash flow information:
Cash paid for interest		53.1	104.8	127.5
Cash paid for income taxes, net of income tax refunds		$ 973.7	$ 677.1	$ 633.8

[1] See Note 4 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.