Supplemental Balance Sheet Information - Other Accrued Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Jun. 30, 2016
Balance Sheet Related Disclosures [Abstract]
Accrued employee-related expenses	$ 82.9	$ 82.8
Restructuring accrual	3.9	6.1
Accrued interest	6.2	0.1
Deferred revenue and fees	59.4	46.2
Accrued income tax	27.6	38.8
Other accrued liabilities and expenses	48.8	45.8
Other accrued liabilities	$ 228.8	$ 219.8