Supplemental Balance Sheet Information - Other Accrued Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Accrued employee-related expenses	$ 119.2	$ 103.9
Restructuring accrual	3.8	8.2
Accrued interest	12.1	11.7
Contract liability	160.2	155.2
Accrued income tax	0.0	8.5
Other accrued liabilities and expenses	73.8	50.9
Other accrued liabilities	$ 369.1	$ 338.4