Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 30, 2016
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 61.3	$ 61.5
Unrecognized Tax Benefits, Including Income Tax Penalties and Interest Accrued	66.8	67.1
Unrecognized tax benefits that impact the effective income tax rate	45.7	45.7
Accrued interest related to uncertain tax positions	5.5	5.6
Interest and penalties subject to indemnification	1.7	2.1
Former Owner [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits Subject to Indemnification	$ 0.8	$ 1.7