Statements of Consolidated Cash Flows - USD ($) $ in Millions		6 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities:
Net earnings		$ 1,737.8	$ 1,592.2
Adjustments to reconcile net earnings to cash flows provided by operating activities:
Depreciation and amortization		281.6	271.9
Amortization of deferred contract costs		526.7	488.6
Deferred income taxes		22.5	9.9
Stock-based compensation expense		132.4	109.0
Net pension income		(11.6)	(20.0)
Net accretion of discounts and amortization of premiums on available-for-sale securities		(17.4)	23.6
Other		16.9	30.8
Changes in operating assets and liabilities:
Increase in accounts receivable		(382.3)	(1.1)
Increase in deferred contract costs		(538.0)	(503.3)
Increase in other assets		(313.6)	(284.6)
Decrease in accounts payable		(19.0)	(20.5)
Decrease in accrued expenses and other liabilities		(77.1)	(78.7)
Net cash flows provided by operating activities		1,358.9	1,617.8
Cash Flows from Investing Activities:
Purchases of corporate and client funds marketable securities		(1,305.5)	(3,707.1)
Proceeds from the sales and maturities of corporate and client funds marketable securities		1,503.2	2,525.6
Capital expenditures		(94.1)	(95.1)
Additions to intangibles		(165.7)	(178.4)
Acquisitions of businesses, net of cash acquired		(33.6)	(14.4)
Proceeds from sale of property, plant, and equipment and other assets		26.4	0.0
Other		8.5	0.0
Net cash flows used in investing activities		(77.8)	(1,469.4)
Cash Flows from Financing Activities:
Net increase/(decrease) in client funds obligations		5,421.9	(8,096.8)
Payments of debt		(0.5)	(0.5)
Repurchases of common stock		(504.7)	(553.5)
Net proceeds from stock purchase plan and stock-based compensation plans		(17.5)	24.8
Dividends paid		(1,032.1)	(865.5)
Net payments related to reverse repurchase agreements		(51.0)	(132.8)
Net cash flows provided by/(used in) financing activities		3,816.1	(9,624.3)
Effect of exchange rate changes on cash, cash equivalents, restricted cash, and restricted cash equivalents		10.6	(24.6)
Net change in cash, cash equivalents, restricted cash, and restricted cash equivalents		5,107.8	(9,500.5)
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of period		8,771.5	22,783.0
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of period		13,879.3	13,282.5
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents to the Consolidated Balance Sheets
Cash and cash equivalents		1,641.3	1,345.0
Restricted cash and restricted cash equivalents included in funds held for clients (A)	[1]	12,238.0	11,937.5
Total cash, cash equivalents, restricted cash, and restricted cash equivalents		13,879.3	13,282.5
Supplemental disclosures of cash flow information:
Cash paid for interest		192.8	104.5
Cash paid for income taxes, net of income tax refunds		$ 590.4	$ 537.1

[1] See Note 6 for a reconciliation of restricted cash and restricted cash equivalents in funds held for clients on the Consolidated Balance Sheets.