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Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 307.5 $ 722.5
Investments 151.8 131.6
Derivative assets 208.3 192.9
Total assets at fair value 667.6 1,047.0
Derivative liabilities (15.8) (8.4)
Total liabilities at fair value (15.8) (8.4)
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 307.5 722.5
Investments 151.8 [1] 131.6 [1]
Derivative assets 127.3 [1] 104.4 [1]
Total assets at fair value 586.6 958.5
Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 81.0 88.5
Total assets at fair value 81.0 88.5
Derivative liabilities (15.8) (8.4)
Total liabilities at fair value $ (15.8) $ (8.4)
[1] Includes investments and derivatives that hedge market-driven changes in liabilities associated with the Company's supplemental benefit plans.