Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Current:
U.S. Domestic	$ 134.9	$ 120.8	$ 114.8
Foreign	23.9	19.8	22.5
State	8.5	10.6	6.8
Total current	167.3	151.2	144.1
Deferred:
U.S. Domestic	(7.4)	4.5	(8.7)
Foreign	(0.4)	(0.9)	(0.4)
State	1.9	(3.0)	(2.5)
Total deferred	(5.9)	0.6	(11.6)
Total Provision for income taxes	$ 161.4	$ 151.8	$ 132.5