Other Income (Expense), net - Details of Other Income (Expense), Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Income And Expenses [Abstract]
Interest and dividend income	$ 3.6	$ 3.2
Net foreign exchange transaction losses	(2.0)	(1.6)
Bank fee expense	(1.6)	(1.6)
Non-controlling interests	0.2	0.2
Other, net	0.2	0.1
Other income, net	$ 0.4	$ 0.3