Goodwill And Intangible Assets, Net (Changes In Goodwill) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Beginning balance	$ 3,062.0
Additions and other adjustments, net	0.4
Currency translation adjustments	(38.3)
Ending balance	3,100.7
Employer Services [Member]
Finite-Lived Intangible Assets [Line Items]
Beginning balance	1,887.6
Additions and other adjustments, net	(0.4)
Currency translation adjustments	(23.0)
Ending balance	1,910.2
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	(15.3)
Ending balance	$ 1,185.7