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Derivative Instruments (Notional Amount of All Foreign Exchange Contracts and Interest Rate Swaps Outstanding) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Cash flow - foreign exchange contracts $ 113.1 $ 64.6
Fair value - foreign exchange contracts 365.7 189.2
Fair value - interest rate contracts 350.0 200.0
Undesignated hedge - cross currency interest rate swap $ 81.2