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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Carrying value and estimated fair value of other financial instruments
The carrying values and estimated fair values of the Company's other financial instruments follow:

              
   
At December 31,
 
   
2011
  
2010
 
(In millions)
 
Carrying
Amount
 
Est. Fair
Value
  
Carrying
Amount
 
Est. Fair
Value
 
Long-term debt
 $1,622.3  $1,804.4  $1,715.9  $1,841.2 
Short-term borrowings & notes payable
  227.1   227.1   118.3   118.3 
Cash & cash equivalents
  8.6   8.6   10.4   10.4