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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Of Financial Instruments (Tables) [Abstract]  
Fair Value By Balance Sheet Grouping Text Block
       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 $ 138.0 $ 138.0 $ 138.0 $ -
Derivative financial instruments:            
 Assets   15.4   15.4   -   15.4
 Liabilities   6.0   6.0   -   6.0
Debt   1,479.1   1,700.7   1,624.2   76.5

The estimated fair value of financial instruments at December 31, 2012 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 $ 304.6 $ 304.6 $ 304.6 $ -
Derivative financial instruments:            
 Assets   6.2   6.2   -   6.2
 Liabilities   11.8   11.8   -   11.8
Debt    1,480.1   1,703.2   1,625.6   77.6