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Goodwill
 6 Months Ended
Mar. 31, 2012
Goodwill [Abstract]  
Goodwill

8.    GOODWILL

Changes to the carrying amount of consolidated goodwill by segment for the six months ended 31 March 2012 are as follows:

 

        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  

Goodwill is subject to impairment testing at least annually. In addition, goodwill is tested more frequently if a change in circumstances or the occurrence of events indicates that potential impairment exists.