Goodwill And Intangible Assets, Net (Changes In Goodwill) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 3,073.6
Additions and other adjustments, net	119.5
Currency translation adjustments	(29.4)
Ending balance	3,163.7
Employer Services [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	1,935.0
Additions and other adjustments, net	61.5
Currency translation adjustments	(17.8)
Ending balance	1,978.7
PEO Services [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	4.8
Additions and other adjustments, net
Currency translation adjustments
Ending balance	4.8
Dealer Services [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	1,133.8
Additions and other adjustments, net	58.0
Currency translation adjustments	(11.6)
Ending balance	$ 1,180.2