Goodwill And Intangible Assets, Net (Changes In Goodwill) (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Goodwill
Goodwill, Period Increase (Decrease)		$ 0.0
Goodwill, Impairment Loss			$ (42.7)
Goodwill [Roll Forward]
Beginning balance	[1]	1,793.5	1,883.5
Additions and other adjustments, net			6.8
Currency translation adjustments		(11.1)	(96.8)
Ending balance		1,682.0	1,793.5	[1]
Goodwill, Written off Related to Sale of Business Unit		100.4
Employer Services [Member]
Goodwill
Goodwill, Period Increase (Decrease)		(100.4)
Goodwill [Roll Forward]
Beginning balance	[1]	1,788.7	1,878.7
Additions and other adjustments, net			6.8
Currency translation adjustments		(11.1)	(96.8)
Ending balance		1,677.2	1,788.7	[1]
Goodwill, Written off Related to Sale of Business Unit		0.0
PEO Services [Member]
Goodwill
Goodwill, Period Increase (Decrease)		0.0
Goodwill [Roll Forward]
Beginning balance	[1]	4.8	4.8
Additions and other adjustments, net			0.0
Currency translation adjustments		0.0	0.0
Ending balance		4.8	4.8	[1]
Goodwill, Written off Related to Sale of Business Unit		0.0
Other Segments [Member]
Goodwill
Goodwill, Period Increase (Decrease)		100.4
Goodwill [Roll Forward]
Beginning balance		0.0	0.0	[1]
Additions and other adjustments, net			0.0
Currency translation adjustments		0.0	0.0
Ending balance		0.0	$ 0.0
Goodwill, Written off Related to Sale of Business Unit		$ 100.4

[1] The goodwill balance at June 30, 2015 and 2014 is net of accumulated impairment losses of $42.7 million related to the Employer Services segment.