Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Accrued expenses	$ 1.9	$ 1.9
Accounts receivable	1.5	1.0
Net operating loss carryforward	4.8	16.4
Stock-based compensation	1.4	1.1
Credits		0.1
Lease obligations	7.2	10.1
Other comprehensive income	0.4	0.4
Other	1.1	0.6
Total deferred tax assets	18.3	31.6
Valuation allowance	(1.9)	(1.7)
Net deferred tax assets	16.4	29.9
Deferred tax liabilities:
Intangible assets	(70.3)	(69.1)
Property and equipment	(5.9)	(7.2)
Lease assets	(6.4)	(8.4)
Other	(0.5)	(0.2)
Total deferred tax liabilities	(83.1)	(84.9)
Net deferred tax liabilities	$ (66.7)	$ (55.0)