Goodwill And Intangible Assets, Net (Changes In Goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Goodwill [Roll Forward]
Beginning balance	$ 3,062.0	$ 2,980.3
Additions and other adjustments, net	30.2	163.0
Currency translation adjustments	(3.1)	81.3
Goodwill, Impairment Loss	42.7	0	0
Ending balance	3,052.6	3,062.0	2,980.3
Employer Services [Member]
Goodwill [Roll Forward]
Beginning balance	1,887.6	1,841.7
Additions and other adjustments, net	29.4	106.8
Currency translation adjustments	(4.5)	60.9
Goodwill, Impairment Loss	(42.7)
Ending balance	1,878.8	1,887.6
PEO Services [Member]
Goodwill [Roll Forward]
Beginning balance	4.8	4.8
Additions and other adjustments, net	0	0
Currency translation adjustments	0	0
Goodwill, Impairment Loss	0
Ending balance	4.8	4.8
Dealer Services [Member]
Goodwill [Roll Forward]
Beginning balance	1,169.6	1,133.8
Additions and other adjustments, net	0.8	56.2
Currency translation adjustments	1.4	20.4
Goodwill, Impairment Loss	0
Ending balance	$ 1,169.0	$ 1,169.6