Quarterly report pursuant to Section 13 or 15(d)

Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities) (Detail)

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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets And Liabilities Components [Line Items]    
Cash equivalents   $ 351.2
Derivative assets 55.9 157.9
International marketable securities 25.3 27.1
Foreign exchange contracts 23.5 8.0
Total Assets 104.7 544.2
Derivative liabilities 11.7 19.5
Foreign exchange contracts 1.3 3.5
Total Liabilities 13.0 23.0
Derivative asset, fair value 79.4 165.9
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Cash equivalents   351.2
Derivative assets      
International marketable securities 25.3 27.1
Foreign exchange contracts      
Total Assets 25.3 378.3
Derivative liabilities      
Foreign exchange contracts      
Total Liabilities      
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Cash equivalents     
Derivative assets      
International marketable securities      
Foreign exchange contracts 23.5 8.0
Total Assets 23.5 8.0
Derivative liabilities      
Foreign exchange contracts 1.3 3.5
Total Liabilities 1.3 3.5
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Cash equivalents     
Derivative assets 55.9 157.9 [1]
International marketable securities      
Foreign exchange contracts      
Total Assets 55.9 157.9
Derivative liabilities 11.7 19.5
Foreign exchange contracts      
Total Liabilities 11.7 19.5
Accounts Receivable [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Derivative asset, fair value   83.8
Not Designated as Hedging Instrument [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Derivative asset, fair value 57.0 160.7
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Derivative asset, fair value     
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Derivative asset, fair value     
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Accounts Receivable [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Derivative asset, fair value   83.8
Designated as Hedging Instrument [Member]
    
Fair Value, Assets And Liabilities Components [Line Items]    
Derivative asset, fair value $ 22.4 $ 5.2
[1] Derivative assets includes $83.8 million classified as Accounts receivable in the Statements of Unaudited Condensed Consolidated Financial Position as of December 31, 2011. Refer to NOTE 3 - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES for further information.