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Other Income (Expense), net - Details of Other Income (Expense), Net (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Other Income And Expenses [Abstract]    
Interest and dividend income $ 3.6 $ 3.2
Net foreign exchange transaction gains (losses) (1.5) (0.5)
Bank fee expense (1.4) (1.1)
Net gain/(loss) on disposals of business and property and equipment (2.7) 3.3
Other, net (0.9) 0.5
Other income (expense), net $ (2.9) $ 5.4