Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Undistributed foreign pre-tax earnings	$ 519.8
Accrued tax liability net of foreign tax credits	135.5
Effective cash taxes, amount	64.0
Unrecognized tax benefits	3.1	$ 3.1
Accrued interest related to uncertain tax positions	$ 0.3
Accrued interest and penalties related to uncertain tax positions		$ 0.3