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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value of Financial Instruments [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The fair values of non-current financial instruments, determined based on Level 2 inputs, are shown in the following table:
 
December 31, 2011
 
December 31, 2010
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
 
(in millions)
Long-term debt, less current maturities
$
1,411.4

 
$
1,486.2

 
$
1,631.5

 
$
1,721.0