Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate, percent	19.10%	10.00%
U.S. statutory rate	21.00%
Unrecognized tax benefits	$ 42.3		$ 42.8
Liability for uncertainty in income taxes, current	7.4
Liability for uncertain tax positions, noncurrent	34.9
Unrecognized tax benefits that would impact effective tax rate	38.2
Interest and penalties accrued	$ 4.0		$ 3.8