Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Company's effective tax rate	27.70%	3.50%	26.90%	12.00%
Increase in unrecognized tax benefits	$ (0.3)
Increase in unrecognized tax benefits that would impact the effective tax rate			$ (0.2)
Unrecognized tax benefits that would impact effective tax rate	(0.3)		(0.3)
Unrecognized tax benefits, interest expense	(0.1)		(0.2)
Unrecognized tax benefits, income tax penalties and interest accrued	5.1		5.1		$ 4.9
Reasonable possible decrease in unrecognized tax benefits during the next twelve months	$ 6.1		$ 6.1