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Property, Plant and Equipment (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Property, Plant and Equipment |  |
Utility | $ 3,285.3 | $ 2,998.9
Non-utility | 5,564.6 | 5,346.4
Total property, plant and equipment | 8,849.9 | 8,345.3
Distribution |  |
Property, Plant and Equipment |  |
Utility | 2,835.3 | 2,634.2
Transmission |  |
Property, Plant and Equipment |  |
Utility | 96.4 | 93.5
General and other |  |
Property, Plant and Equipment |  |
Utility | 241.0 | 167.3
Land |  |
Property, Plant and Equipment |  |
Non-utility | 180.1 | 169.9
Buildings and improvements |  |
Property, Plant and Equipment |  |
Non-utility | 351.2 | 382.2
Transportation equipment |  |
Property, Plant and Equipment |  |
Non-utility | 289.3 | 301.7
Equipment, primarily cylinders and tanks |  |
Property, Plant and Equipment |  |
Non-utility | 3,529.4 | 3,421.5
Electric generation |  |
Property, Plant and Equipment |  |
Non-utility | 310.0 | 309.4
Pipeline and related assets |  |
Property, Plant and Equipment |  |
Non-utility | 454.5 | 235.8
Work in process |  |
Property, Plant and Equipment |  |
Utility | 112.6 | 103.9
Non-utility | 95.3 | 201.6
Other |  |
Property, Plant and Equipment |  |
Non-utility | $ 354.8 | $ 324.3

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -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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- Definition Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale. + 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 + Details
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