Business Segment and Geographic Information (Schedule of Income Information) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Sep. 30, 2012
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Segment Reporting Information [Line Items] | |||||||||
Business restructuring and cost reduction plans | $ 0 | $ 0 | $ 0 | $ 86.8 | $ 327.4 | ||||
Other operating income | (4.5) | (2.6) | (10.6) | (10.4) | |||||
Operating income | 383.1 | 482.8 | 1,145.2 | 1,124.5 | |||||
Merchant Gases [Member]
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Segment Reporting Information [Line Items] | |||||||||
Operating income | 164.9 | 164.6 | 504.0 | 483.4 | |||||
Tonnage Gases [Member]
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Segment Reporting Information [Line Items] | |||||||||
Operating income | 119.9 | 134.3 | 381.2 | 371.1 | |||||
Electronics and Performance Materials [Member]
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Segment Reporting Information [Line Items] | |||||||||
Operating income | 86.8 | 176.7 | [1] | 225.6 | 340.3 | [1] | |||
Equipment and Energy [Member]
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Segment Reporting Information [Line Items] | |||||||||
Operating income | 16.0 | 9.8 | 45.0 | 26.9 | |||||
Segment Total [Member]
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Segment Reporting Information [Line Items] | |||||||||
Operating income | $ 387.6 | $ 485.4 | $ 1,155.8 | $ 1,221.7 | |||||
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