Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective tax rate, benefit percentage	17.70%	54.80%		36.50%
Earnings of foreign entities	$ 18.6	$ 2.5	$ 24.2	$ 11.4
Positive impact of uncertain tax positions on effective tax rate				1.4
Unrecognized tax benefit for uncertain tax positions	14.7		14.7		15.0
Accrued interest and penalties related to income tax liabilities	2.2		2.2		2.3
Decrease in unrecognized tax benefits due to expiration of statutes of limitations and settlement of various audits	$ 0.8		$ 0.8