XML 51 R32.htm IDEA: XBRL DOCUMENT
v3.20.2

Shareholders' Equity (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2020
Stockholders Equity Note [Abstract] |
Schedule of Accumulated Other Comprehensive Income | The components of accumulated other comprehensive income (AOCI), 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 Debt Securities |  |  | Total |
Spire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at September 30, 2018 |  | $ | 7.9 |  |  | $ | (1.5 | ) |  | $ | — |  |  | $ | 6.4 |
Other comprehensive (loss) income |  |  | (36.9 | ) |  |  | (0.9 | ) |  |  | 0.1 |  |  |  | (37.7 | )
Balance at September 30, 2019 |  |  | (29.0 | ) |  |  | (2.4 | ) |  |  | 0.1 |  |  |  | (31.3 | )
Other comprehensive loss |  |  | (9.4 | ) |  |  | (0.5 | ) |  |  | — |  |  |  | (9.9 | )
Balance at September 30, 2020 |  | $ | (38.4 | ) |  | $ | (2.9 | ) |  | $ | 0.1 |  |  | $ | (41.2 | )
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at September 30, 2018 |  | $ | — |  |  | $ | (1.6 | ) |  | $ | — |  |  | $ | (1.6 | )
Other comprehensive loss |  |  | — |  |  |  | (0.8 | ) |  |  | — |  |  |  | (0.8 | )
Balance at September 30, 2019 |  |  | — |  |  |  | (2.4 | ) |  |  | — |  |  |  | (2.4 | )
Other comprehensive loss |  |  | — |  |  |  | (0.5 | ) |  |  | — |  |  |  | (0.5 | )
Balance at September 30, 2020 |  | $ | — |  |  | $ | (2.9 | ) |  | $ | — |  |  | $ | (2.9 | )

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration