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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Of Financial Instruments (Tables) [Abstract]  
Fair Value By Balance Sheet Grouping Text Block
Note ##FV. Fair Value of Financial Instruments 
               
The estimated fair value of financial instruments at December 31, 2011 was as follows:
               
       Fair Value Measurements at Reporting Date Using
          Quoted Prices in Significant
    Total Total Active Markets for Observable
    Carrying Estimated Identical Assets Inputs
(In millions) Amount  Fair Value  (Level 1) (Level 2)
Cash and cash equivalents $ 380.6 $ 380.6 $ 380.6 $ -
Derivative financial instruments:            
 Assets   20.7   20.7   -   20.7
 Liabilities   17.1   17.1   -   17.1
Debt   1,509.3   1,791.3   1,684.5   106.8

The estimated fair value of financial instruments at December 31, 2010 was as follows:
               
       Fair Value Measurements at Reporting Date Using
          Quoted Prices in Significant
    Total Total Active Markets for Observable
    Carrying Estimated Identical Assets Inputs
(In millions) Amount  Fair Value  (Level 1) (Level 2)
Cash and cash equivalents $ 432.3 $ 432.3 $ 432.3 $ -
Derivative financial instruments:            
 Assets   20.1   20.1   -   20.1
 Liabilities   21.9   21.9   -   21.9
Debt (a)   1,063.3   1,328.4   1,284.9   43.5