Goodwill And Intangible Assets, Net (Changes In Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Goodwill [Roll Forward]
Beginning balance	$ 2,300.5	$ 2,338.4
Additions and other adjustments	26.2	11.1
Currency translation adjustments	12.7	(49.0)
Ending balance	2,339.4	2,300.5
Employer Services
Goodwill [Roll Forward]
Beginning balance	2,295.7	2,333.6
Additions and other adjustments	26.2	11.1
Currency translation adjustments	12.7	(49.0)
Ending balance	2,334.6	2,295.7
PEO Services
Goodwill [Roll Forward]
Beginning balance	4.8	4.8
Additions and other adjustments	0.0	0.0
Currency translation adjustments	0.0	0.0
Ending balance	$ 4.8	$ 4.8