Consolidated Statements Of Income and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Service revenue	$ 2,094.3	$ 2,016.0	$ 1,939.4
Reimbursement revenue	332.0	314.3	327.0
Total revenue	2,426.3	2,330.3	2,266.4
Costs and expenses:
Direct costs	1,360.3	1,344.2	1,279.2
Reimbursable out-of-pocket expenses	332.0	314.3	327.0
Selling, general and administrative	385.3	367.2	379.8
Depreciation	74.6	69.3	66.4
Amortization	22.3	15.6	14.9
Restructuring charge (benefit)	27.8	19.8	(0.4)
Total costs and expenses	2,202.3	2,130.4	2,066.9
Income from operations	224.0	199.9	199.5
Interest expense, net	(8.6)	(7.1)	(9.1)
Miscellaneous expense, net	(0.2)	7.4	(2.5)
Total other expense, net	(8.8)	0.3	(11.6)
Income before provision for income taxes	215.2	200.2	187.9
Provision for income taxes	60.3	52.4	58.8
Net income	$ 154.9	$ 147.8	$ 129.1
Earnings per share:
Basic	$ 2.90	$ 2.69	$ 2.28
Diluted	$ 2.86	$ 2.65	$ 2.25
Weighted average shares:
Basic	53.5	54.9	56.5
Diluted	54.2	55.8	57.5
Statement of Comprehensive Income [Abstract]
Net income	$ 154.9	$ 147.8	$ 129.1
Unrealized gain (loss) on derivative instruments, net of taxes	(5.8)	(3.9)	5.1
Foreign currency translation adjustment	(34.3)	(94.1)	27.0
Total comprehensive income	$ 114.8	$ 49.8	$ 161.2