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Property, Plant and Equipment (Tables) | 12 Months Ended
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Sep. 30, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | September 30, 2017, estimated useful lives by type were as follows:
Asset Type |  | Minimum Estimated Useful Life (in years) |  | Maximum Estimated Useful Life (in years)
Buildings and improvements |  | 10 |  | 40
Equipment, primarily cylinders and tanks |  | 5 |  | 40
Electricity generation facilities |  | 25 |  | 40
Pipeline and related assets |  | 25 |  | 40
Transportation equipment and office furniture and fixtures |  | 3 |  | 12
Computer software |  | 1 |  | 10
Property, plant and equipment comprise the following at September 30:
| 2017 |  | 2016
Utilities: |  |  |
Distribution | $ | 2,835.3 |  |  | $ | 2,634.2 |
Transmission | 96.4 |  |  | 93.5 |
Work in process | 112.6 |  |  | 103.9 |
General and other | 241.0 |  |  | 167.3 |
Total Utilities | 3,285.3 |  |  | 2,998.9 |
Non-utility: |  |  |
Land | 180.1 |  |  | 169.9 |
Buildings and improvements | 351.2 |  |  | 382.2 |
Transportation equipment | 289.3 |  |  | 301.7 |
Equipment, primarily cylinders and tanks | 3,529.4 |  |  | 3,421.5 |
Electric generation | 310.0 |  |  | 309.4 |
Pipeline and related assets | 454.5 |  |  | 235.8 |
Work in process | 95.3 |  |  | 201.6 |
Other | 354.8 |  |  | 324.3 |
Total non-utility | 5,564.6 |  |  | 5,346.4 |
Total property, plant and equipment | $ | 8,849.9 |  |  | $ | 8,345.3 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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