Statements of Consolidated Cash Flows - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Cash Flows from Operating Activities:
Net earnings		$ 4,413.5	$ 4,079.7	$ 3,752.0
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization		585.9	582.4	561.9
Amortization of deferred contract costs		1,200.5	1,145.3	1,067.6
Deferred income taxes		156.4	37.0	(37.4)
Stock-based compensation expense		242.6	266.1	243.5
Bad debt expense		47.5	53.2	54.6
Net pension (income)/expense		(15.4)	(19.7)	(22.9)
Net accretion of discounts and amortization of premiums on available-for-sale securities		(88.2)	(72.2)	(42.6)
Other		4.2	13.4	(1.7)
Changes in operating assets and liabilities:
(Increase)/decrease in accounts receivable		1.0	(146.6)	(483.7)
Increase in deferred contract costs		(1,307.9)	(1,290.3)	(1,271.2)
Increase in other assets		(204.5)	(59.8)	(157.2)
Increase/(decrease) in accounts payable		(4.5)	60.6	1.8
Increase in accrued expenses and other liabilities		410.1	290.6	492.9
Net cash flows provided by operating activities		5,441.2	4,939.7	4,157.6
Cash Flows from Investing Activities:
Purchases of corporate and client funds marketable securities		(12,359.7)	(7,857.9)	(6,835.3)
Proceeds from the sales and maturities of corporate and client funds marketable securities		8,344.7	6,539.1	6,039.5
Capital expenditures		(196.6)	(168.7)	(208.4)
Additions to intangibles		(468.5)	(378.3)	(355.0)
Acquisitions of businesses, net of cash acquired		(22.8)	(1,165.1)	(33.6)
Proceeds from the sale of property, plant, and equipment and other assets		0.0	10.8	28.3
Other		(10.9)	(14.9)	(24.5)
Net cash flows used in investing activities		(4,713.8)	(3,035.0)	(1,389.0)
Cash Flows from Financing Activities:
Net increase/(decrease) in client funds obligations		13,242.6	(8,274.0)	1,014.1
Net cash (distributed)/received from the Internal Revenue Service		24.0	(552.2)	602.7
Payments of debt		(1.1)	(1,001.2)	(0.9)
Proceeds from the issuance of debt		985.7	1,980.3	0.0
Settlement of cash flow hedges		3.7	(15.6)	0.0
Repurchases of common stock		(2,083.3)	(1,280.5)	(1,231.7)
Net (repurchases)/proceeds from stock-based compensation plans and stock purchase plan		(1.0)	131.0	47.2
Dividends paid		(2,626.3)	(2,398.9)	(2,183.1)
Net (payments)/proceeds related to reverse repurchase agreements		106.2	(331.8)	320.0
Net (payments)/proceeds from issuance of commercial paper		(4,769.5)	4,769.5	0.0
Net cash flows provided by/(used in) financing activities		4,881.0	(6,973.4)	(1,431.7)
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents		(37.8)	37.3	(22.4)
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents		5,570.6	(5,031.4)	1,314.5
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year		5,054.6	10,086.0	8,771.5
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year		10,625.2	5,054.6	10,086.0
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents to the Consolidated Balance Sheets
Cash and cash equivalents		4,230.1	3,347.8	2,913.4
Restricted cash and restricted cash equivalents included in funds held for clients	[1]	6,395.1	1,706.8	7,172.6
Total cash, cash equivalents, restricted cash, and restricted cash equivalents		10,625.2	5,054.6	10,086.0
Supplemental disclosures of cash flow information:
Cash paid for interest		439.6	426.8	353.9
Cash paid for income taxes, net of income tax refunds		$ 1,006.7	$ 1,198.0	$ 1,185.2

[1] See Note 5 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.