Statements of Consolidated Earnings - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
REVENUES:
TOTAL REVENUES		$ 4,512.4	$ 4,215.6
Costs of revenues:
Operating expenses		2,157.6	2,074.4
Research and development		236.5	209.8
Depreciation and amortization		121.3	109.4
TOTAL COSTS OF REVENUES		2,515.4	2,393.6
Selling, general, and administrative expenses		880.3	800.3
Interest expense		91.6	51.2
TOTAL EXPENSES		3,487.3	3,245.1
Other (income)/expense, net		(67.7)	(39.5)
EARNINGS BEFORE INCOME TAXES		1,092.8	1,010.0
Provision for income taxes		233.4	231.0
NET EARNINGS		$ 859.4	$ 779.0
Earnings Per Share [Abstract]
BASIC EARNINGS PER SHARE (in US$ per share)		$ 2.09	$ 1.88
DILUTED EARNINGS PER SHARE (in US$ per share)		$ 2.08	$ 1.87
Basic weighted average shares outstanding (shares)		411.7	414.6
Diluted weighted average shares outstanding (shares)		413.6	416.9
Revenues, other than interest on funds held for clients and PEO revenues
REVENUES:
TOTAL REVENUES		$ 2,843.0	$ 2,646.5
Interest on funds held for clients
REVENUES:
TOTAL REVENUES		201.7	141.0
PEO Revenues
REVENUES:
TOTAL REVENUES	[1]	$ 1,467.7	$ 1,428.1

[1] Professional Employer Organization (“PEO”) revenues are net of direct pass-through costs, primarily consisting of payroll wages and payroll taxes of $15,994.6 million and $15,534.2 million for the three months ended September 30, 2023 and 2022, respectively.