Statements of Consolidated Cash Flows - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash Flows from Operating Activities:
Net earnings	$ 2,075.1	$ 1,919.5
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization	292.3	289.7
Amortization of deferred contract costs	598.1	565.9
Deferred income taxes	119.1	32.5
Stock-based compensation expense	131.9	139.7
Bad debt expense	22.5	23.1
Net pension (income)/loss	(7.7)	(9.8)
Net accretion of discounts and amortization of premiums on available-for-sale securities	(45.4)	(31.5)
Other	4.2	4.7
Changes in operating assets and liabilities:
Decrease/(increase) in accounts receivable	145.9	(94.7)
Increase in deferred contract costs	(556.4)	(565.3)
Increase in other assets	(350.1)	(271.0)
(Decrease)/increase in accounts payable	(25.0)	82.4
Decrease in accrued expenses and other liabilities	(629.3)	(110.5)
Net cash flows provided by operating activities	1,775.2	1,974.7
Cash Flows from Investing Activities:
Purchases of corporate and client funds marketable securities	(5,652.0)	(3,990.7)
Proceeds from the sales and maturities of corporate and client funds marketable securities	3,436.1	2,524.1
Capital expenditures	(73.2)	(98.2)
Additions to intangibles	(209.1)	(175.7)
Acquisitions of businesses, net of cash acquired	(22.9)	(1,160.6)
Proceeds from the sale of property, plant, and equipment and other assets	0.0	3.3
Other	(18.4)	(4.5)
Net cash flows used in investing activities	(2,539.5)	(2,902.3)
Cash Flows from Financing Activities:
Net increase in client funds obligations	36,273.1	9,090.4
Net cash distributed from the Internal Revenue Service	(1.2)	(487.6)
Payments of debt	(0.5)	(0.6)
Proceeds from the issuance of debt	0.0	988.9
Settlement of cash flow hedges	0.0	(12.5)
Repurchases of common stock	(881.8)	(644.9)
Net (repurchases)/proceeds from stock-based compensation plans and stock purchase plan	(40.0)	38.6
Dividends paid	(1,256.0)	(1,145.1)
Net (payments)/proceeds related to reverse repurchase agreements	18.5	(344.7)
Net (payments)/proceeds related to commercial paper	(4,769.5)	0.0
Net cash flows provided by financing activities	29,342.6	7,482.5
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents	28.8	(36.7)
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents	28,607.1	6,518.2
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of period	5,054.6	10,086.0
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period	33,661.7	16,604.2
Supplemental disclosures of cash flow information:
Cash paid for interest	253.9	249.5
Cash paid for income taxes, net of income tax refunds	$ 303.7	$ 583.5