Goodwill And Intangible Assets, Net (Changes In Goodwill) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 3,062.0
Additions and other adjustments, net	0.5
Currency translation adjustments	26.3
Ending balance	3,088.8
Employer Services [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	1,887.6
Additions and other adjustments, net	(0.3)
Currency translation adjustments	14.2
Ending balance	1,901.5
PEO Services [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	4.8
Additions and other adjustments, net	0
Currency translation adjustments	0
Ending balance	4.8
Dealer Services [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	1,169.6
Additions and other adjustments, net	0.8
Currency translation adjustments	12.1
Ending balance	$ 1,182.5