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Inventories - Components of Inventories (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2013
--- | --- | --- | ---
Inventory |  |  |
Total inventories | $ 324.4 | $ 365.5 | $ 292.4
Non-utility LPG and Natural Gas |  |  |
Inventory |  |  |
Total inventories | 251.4 | 230.0 | 220.3
Gas Utility Natural Gas |  |  |
Inventory |  |  |
Total inventories | 7.5 | 78.9 | 5.4
Materials, Supplies and Other |  |  |
Inventory |  |  |
Total inventories | $ 65.5 | $ 56.6 | $ 66.7

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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