Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Taxes [Line Items]
Income tax expense (benefit)	$ (8.4)	$ 2.4	$ (0.2)	$ 8.1
Unrecognized tax benefits	1.7		1.7		$ 1.5
Accrued Interest included in unrecognized tax benefits	0.3		0.3		$ 0.2
Unrecognized tax benefits if recognized would impact on effective income tax rate	1.7		$ 1.7
Income tax examination description			With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2015.
Deferred Compensation, Share-based Payments
Income Taxes [Line Items]
Income tax expense (benefit)			$ 3.7
State [Member]
Income Taxes [Line Items]
Valuation allowance	$ 12.0		12.0
Income tax expense (benefit)			2.3
Unremitted Foreign Earnings [Member]
Income Taxes [Line Items]
Income tax expense (benefit)			1.8
US and Foreign Operations [Member]
Income Taxes [Line Items]
Income tax expense (benefit)			$ 2.9