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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS - Expected Future Benefit Payments (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014
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Pension Plans | Pensions from Qualified Trust |
Expected benefit payments [Abstract] |
2015 | $ 22.3
2016 | 25.2
2017 | 27.0
2018 | 30.6
2019 | 32.9
2020 - 2024 | 224.4
Pension Plans | Pensions from Laclede Gas Funds |
Expected benefit payments [Abstract] |
2015 | 0.5
2016 | 0.5
2017 | 0.6
2018 | 0.6
2019 | 0.7
2020 - 2024 | 4.4
Pension Plans | Benefits Paid from Alagasco Funds |
Expected benefit payments [Abstract] |
2015 | 9.9
2016 | 10.2
2017 | 10.6
2018 | 10.6
2019 | 11.2
2020 - 2024 | 58.7
Postretirement Plans | Pensions from Qualified Trust |
Expected benefit payments [Abstract] |
2015 | 9.7
2016 | 10.6
2017 | 11.5
2018 | 12.5
2019 | 13.9
2020 - 2024 | 87.0
Postretirement Plans | Pensions from Laclede Gas Funds |
Expected benefit payments [Abstract] |
2015 | 0.3
2016 | 0.3
2017 | 0.3
2018 | 0.4
2019 | 0.4
2020 - 2024 | 2.1
Postretirement Plans | Benefits Paid from Alagasco Funds |
Expected benefit payments [Abstract] |
2015 | 3.8
2016 | 3.8
2017 | 3.8
2018 | 3.8
2019 | 3.8
2020 - 2024 | 18.6
Laclede Gas | Pension Plans | Pensions from Qualified Trust |
Expected benefit payments [Abstract] |
2015 | 22.3
2016 | 25.2
2017 | 27.0
2018 | 30.6
2019 | 32.9
2020 - 2024 | 224.4
Laclede Gas | Pension Plans | Pensions from Laclede Gas Funds |
Expected benefit payments [Abstract] |
2015 | 0.5
2016 | 0.5
2017 | 0.6
2018 | 0.6
2019 | 0.7
2020 - 2024 | $ 4.4

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- Definition Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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