Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent	19.90%	18.60%	17.40%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 5.1	$ 2.1
Decreased deferred tax assets net	10.4
Recognized net deferred tax asset	20.9	31.3
Operating Loss Carryforwards, Valuation Allowance	0.0	0.0
Deferred Tax Liabilities, Insurance Premiums	(6.0)	$ 0.0
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	4.5
Operating Loss Carryforwards	$ 41.1