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Goodwill (Tables)
12 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
        Electronics and   
  Merchant  Tonnage  Performance   
  Gases  Gases  Materials  Total
Balance at 30 September 2011$ 479.2 $ 14.1 $ 302.9 $ 796.2
Acquisitions and adjustments  630.0   -   135.4   765.4
Currency translation and other  29.4   .6   6.8   36.8
Balance at 30 September 2012$ 1,138.6 $ 14.7 $ 445.1 $ 1,598.4
Acquisitions and adjustments  73.3   -   2.0   75.3
Currency translation and other  (19.9)   .5   (.5)   (19.9)
Balance at 30 September 2013$ 1,192.0 $ 15.2 $ 446.6 $ 1,653.8