Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rates, percentage	50.00%	18.00%	21.00%	16.00%
Earnings of foreign entities	$ 20.7	$ 12.3	$ 27.6	$ 20.0
Decrease in valuation allowance of deferred tax assets			10.1
Unrecognized tax benefit for uncertain tax positions	22.9		22.9		$ 21.1
Accrued interest and penalties related to income tax liabilities	2.1		2.1		$ 2.2
Decrease in unrecognized tax benefits due to expiration of statutes of limitations and settlement of various audits	$ 1.6		$ 1.6