Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		8 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 0.0	$ (1.9)		$ 0.5	$ (3.4)
Effective income tax rate			24.10%	(2.30%)
Federal net operating tax loss carryforwards						$ 27.0
Percentage of future taxable income						80.00%
Deferred employer payroll taxes under CARES act	$ 5.6			$ 5.6