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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Sep. 30, 2017
Stockholders' Equity Note [Abstract] |
Schedule of accumulated other comprehensive income (loss) | The components of accumulated other comprehensive income (loss), net of income taxes, recognized in the balance sheets at September 30 were as follows:
|  | Net Unrealized Gains (Losses) on Cash Flow Hedges |  | Defined Benefit Pension and Other Postretirement Benefit Plans |  | Net Unrealized Losses on Available for Sale Securities |  | Total
Spire |  |  |  |  |  |  |  |
Balance at September 30, 2015 |  | $ | (0.4 | ) |  | $ | (1.5 | ) |  | $ | (0.1 | ) |  | $ | (2.0 | )
Other comprehensive loss |  | (1.9 | ) |  | (0.3 | ) |  | — |  |  | (2.2 | )
Balance at September 30, 2016 |  | (2.3 | ) |  | (1.8 | ) |  | (0.1 | ) |  | (4.2 | )
Other comprehensive income (loss) |  | 7.2 |  |  | 0.3 |  |  | (0.1 | ) |  | 7.4 |
Balance at September 30, 2017 |  | $ | 4.9 |  |  | $ | (1.5 | ) |  | $ | (0.2 | ) |  | $ | 3.2 |
Spire Missouri |  |  |  |  |  |  |  |
Balance at September 30, 2015 |  | (0.2 | ) |  | (1.5 | ) |  | — |  |  | $ | (1.7 | )
Other comprehensive income (loss) |  | 0.3 |  |  | (0.3 | ) |  | (0.1 | ) |  | (0.1 | )
Balance at September 30, 2016 |  | 0.1 |  |  | (1.8 | ) |  | (0.1 | ) |  | (1.8 | )
Other comprehensive income (loss) |  | — |  |  | 0.2 |  |  | (0.1 | ) |  | 0.1 |
Balance at September 30, 2017 |  | $ | 0.1 |  |  | $ | (1.6 | ) |  | $ | (0.2 | ) |  | $ | (1.7 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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