Income Taxes (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019	Mar. 31, 2020 USD ($) item	Mar. 31, 2019	Jun. 30, 2019 USD ($)
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Percent	4.30%	18.40%	9.60%	19.50%
Gain on cash flow hedge	$ 111.8		$ 83.8
Number of operating units benefit from local tax incentives | item			3
U.S. federal corporate tax rate			21.00%		21.00%
Minimum | Scenario, Plan [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible					$ 25.0
Maximum | Scenario, Plan [Member]
Income Tax Contingency [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible					$ 27.0