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Other Income (Expense), net - Details of Other Income (Expense), Net (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Other Income And Expenses [Abstract]    
Interest and dividend income $ 3.2 $ 3.5
Net foreign exchange transaction losses (1.7) (3.6)
Settlement agreement and related costs (0.1) (0.1)
Noncontrolling interests 0.3 0.7
Other, net (1.5) (4.5)
Other income (expense), net $ 0.2 $ (4.0)