Statements of Consolidated Cash Flows - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Cash Flows from Operating Activities:
Net earnings		$ 4,079.7	$ 3,752.0	$ 3,412.0
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization		582.4	561.9	549.3
Amortization of deferred contract costs		1,145.3	1,067.6	992.9
Deferred income taxes		37.0	(37.4)	(80.1)
Stock-based compensation expense		266.1	243.5	220.4
Bad debt expense		53.2	54.6	44.0
Net pension income		(19.7)	(22.9)	(42.6)
Net accretion of discounts and amortization of premiums on available-for-sale securities		(72.2)	(42.6)	23.0
Other		13.4	(1.7)	27.4
Changes in operating assets and liabilities:
(Increase)/decrease in accounts receivable		(146.6)	(483.7)	129.2
Increase in deferred contract costs		(1,290.3)	(1,271.2)	(1,189.2)
Increase in other assets		(59.8)	(157.2)	(168.2)
Increase/(decrease) in accounts payable		60.6	1.8	(11.8)
Increase in accrued expenses and other liabilities		290.6	492.9	301.3
Net cash flows provided by operating activities		4,939.7	4,157.6	4,207.6
Cash Flows from Investing Activities:
Purchases of corporate and client funds marketable securities		(7,857.9)	(6,835.3)	(6,618.8)
Proceeds from the sales and maturities of corporate and client funds marketable securities		6,539.1	6,039.5	4,705.5
Capital expenditures		(168.7)	(208.4)	(206.3)
Additions to intangibles		(378.3)	(355.0)	(365.3)
Acquisitions of businesses, net of cash acquired		(1,165.1)	(33.6)	(32.4)
Proceeds from the sale of property, plant, and equipment and other assets		10.8	28.3	0.0
Other		(14.9)	(24.5)	0.0
Net cash flows used in investing activities		(3,035.0)	(1,389.0)	(2,517.3)
Cash Flows from Financing Activities:
Net (decrease)/increase in client funds obligations		(8,274.0)	1,014.1	(12,701.6)
Net cash (distributed)/received from the Internal Revenue Service		(552.2)	602.7	0.0
Payments of debt		(1,001.2)	(0.9)	(1.0)
Proceeds from the issuance of debt		1,980.3	0.0	0.0
Settlement of cash flow hedges		(15.6)	0.0	0.0
Repurchases of common stock		(1,280.5)	(1,231.7)	(1,121.4)
Net proceeds from stock purchase plan and stock-based compensation plans		131.0	47.2	91.6
Dividends paid		(2,398.9)	(2,183.1)	(1,903.6)
Net (payments)/proceeds related to reverse repurchase agreements		(331.8)	320.0	(44.7)
Net proceeds from issuance of commercial paper		4,769.5	0.0	0.0
Net cash flows used in financing activities		(6,973.4)	(1,431.7)	(15,680.7)
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents		37.3	(22.4)	(21.1)
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents		(5,031.4)	1,314.5	(14,011.5)
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year		10,086.0	8,771.5	22,783.0
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year		5,054.6	10,086.0	8,771.5
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents to the Consolidated Balance Sheets
Cash and cash equivalents		3,347.8	2,913.4	2,083.5
Restricted cash and restricted cash equivalents included in funds held for clients	[1]	1,706.8	7,172.6	6,688.0
Total cash, cash equivalents, restricted cash, and restricted cash equivalents		5,054.6	10,086.0	8,771.5
Supplemental disclosures of cash flow information:
Cash paid for interest		426.8	353.9	246.5
Cash paid for income taxes, net of income tax refunds		$ 1,198.0	$ 1,185.2	$ 1,080.7

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