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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components Of Income Tax Expense Benefit [Line Items]
Income tax effective rate	9.50%		181.40%	164.70%	107.90%
Income tax benefit reversed	$ 3.0
CARES Act income tax expenses benefit				$ 0.0
Internal Revenue Service [Member]
Components Of Income Tax Expense Benefit [Line Items]
Income tax benefit		$ 17.8		17.8
Income tax expense	0.1
Minimum [Member]
Components Of Income Tax Expense Benefit [Line Items]
Decrease in unrecognized tax benefits	0.2			0.2
Maximum [Member]
Components Of Income Tax Expense Benefit [Line Items]
Decrease in unrecognized tax benefits	$ 0.7			$ 0.7