Income Taxes - Components of Provision for Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Current, U.S. Domestic	$ 114.8	$ 73.1	$ 53.3
Current, Foreign	22.5	15.8	22.0
Current, State	6.8	8.1	9.0
Total current	144.1	97.0	84.3
Deferred, U.S. Domestic	(8.7)	16.0	(5.2)
Deferred, Foreign	(0.4)		(1.1)
Deferred, State	(2.5)	(1.9)	(2.1)
Total deferred	(11.6)	14.1	(8.4)
Total Provision for income taxes	$ 132.5	$ 111.1	$ 75.9