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Goodwill (Tables)
6 Months Ended
Mar. 31, 2012
Goodwill [Abstract]  
Schedule Of Goodwill By Segment
        30 September
2011
     Acquisitions and
Adjustments
     Currency
Translation
     31 March
2012

Merchant Gases

       $ 479.2          $ 9.2          $ 10.6          $ 499.0  

Tonnage Gases

         14.1            —              .8            14.9  

Electronics and Performance Materials

         302.9            11.0            4.0            317.9  
         $ 796.2          $ 20.2          $ 15.4          $ 831.8