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Other Income (Expense), net - Details of Other Income (Expense), Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Income And Expenses [Abstract]      
Interest and dividend income $ 13.5 $ 15.5 $ 11.0
Net foreign exchange transaction gains (losses) 5.3 (7.8) (10.5)
Bank fee expense (5.8) (5.0) (6.8)
Net gain on disposals of property and equipment and other 3.3    
Other, net 3.6 6.1 (5.6)
Other income (expense), net $ 19.9 $ 8.8 $ (11.9)