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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2017
Accounting Policies [Abstract] |
Equity Method Investments | Our equity and cost method investments are included in “Other assets” on the Consolidated Balance Sheets and comprise the following amounts at September 30, 2017 and 2016:
| 2017 |  | 2016
Equity method investments | $ | 59.1 |  |  | $ | 25.9 |
Cost method investments (a) | $ | 61.3 |  |  | $ | 70.1 |
(a) | Cost method investments at September 30, 2017 and 2016 include $7.0 and $18.0, respectively, associated with our investment in a private equity partnership that invests in renewable energy companies.
Cost Method Investments | Our equity and cost method investments are included in “Other assets” on the Consolidated Balance Sheets and comprise the following amounts at September 30, 2017 and 2016:
| 2017 |  | 2016
Equity method investments | $ | 59.1 |  |  | $ | 25.9 |
Cost method investments (a) | $ | 61.3 |  |  | $ | 70.1 |
(a) | Cost method investments at September 30, 2017 and 2016 include $7.0 and $18.0, respectively, associated with our investment in a private equity partnership that invests in renewable energy companies.
Shares Used in Computing Basic and Diluted Earnings Per Share | In the following table, we present shares used in computing basic and diluted earnings per share for Fiscal 2017, Fiscal 2016 and Fiscal 2015:
(Thousands of shares) |  | 2017 |  | 2016 |  | 2015
Weighted-average common shares outstanding for basic computation |  | 173,662 |  |  | 173,154 |  |  | 173,115 |
Incremental shares issuable for stock options and common stock awards (a) |  | 3,497 |  |  | 2,418 |  |  | 2,552 |
Weighted-average common shares outstanding for diluted computation |  | 177,159 |  |  | 175,572 |  |  | 175,667 |
(a) | For Fiscal 2017, Fiscal 2016 and Fiscal 2015, there were 146 shares, 38 shares and 1 share, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive. See “Equity-Based Compensation” below for a description of the impact on the calculation of diluted shares for Fiscal 2017, resulting from the adoption of new accounting guidance regarding share-based payments.
Estimated Useful Lives by Type | 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 |
Average Composite Depreciation Rates | The average composite depreciation rates at our Gas Utility and Electric Utility for Fiscal 2017, 2016 and 2015 were as follows:
| 2017 |  | 2016 |  | 2015
Gas Utility | 2.2 | % |  | 2.2 | % |  | 2.2 | %
Electric Utility | 2.4 | % |  | 2.5 | % |  | 2.5 | %

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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