Supplemental Balance Sheet Information - Other Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 30, 2016
Balance Sheet Related Disclosures [Abstract]
Accrued employee-related expenses	$ 60.4	$ 82.8
Restructuring accrual	4.7	6.1
Accrued interest	1.2	0.1
Deferred revenue and fees	46.6	46.2
Accrued income tax	24.6	38.8
Other accrued liabilities and expenses	46.6	45.8
Other accrued liabilities	$ 184.1	$ 219.8