Goodwill and Intangible Assets, net - Changes In Goodwill (Details) $ in Millions	3 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Balance at June 30, 2021	$ 2,300.5
Currency translation adjustments	(27.1)
Balance at September 30, 2022	2,273.4
Employer Services
Goodwill [Roll Forward]
Balance at June 30, 2021	2,295.7
Currency translation adjustments	(27.1)
Balance at September 30, 2022	2,268.6
PEO Services
Goodwill [Roll Forward]
Balance at June 30, 2021	4.8
Currency translation adjustments	0.0
Balance at September 30, 2022	$ 4.8