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Goodwill
6 Months Ended
Mar. 31, 2014
Goodwill Disclosure [Abstract]  
Goodwill disclosure

6.       GOODWILL

Changes to the carrying amount of consolidated goodwill by segment for the six months ended 31 March 2014 are as follows:

        Electronics and   
  Merchant  Tonnage  Performance   
  Gases  Gases  Materials  Total
Balance at 30 September 2013$ 1,192.0 $ 15.2 $ 446.6 $ 1,653.8
Currency translation and other  (39.5)   .3   (.6)   (39.8)
Balance at 31 March 2014$ 1,152.5 $ 15.5 $ 446.0 $ 1,614.0
            

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.