Income Taxes (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 8.9	$ 12.2
Income tax interest and penalty expense	8.9	9.2
Accrued interest related to uncertain tax positions	$ 3.7	$ 3.3