PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS - Expected Future Benefit Payments (Details) $ in Millions |
Sep. 30, 2016
USD ($)
|
---|---|
Pension Plans | |
Expected benefit payments [Abstract] | |
2017 | $ 61.3 |
2018 | 56.2 |
2019 | 57.1 |
2020 | 56.6 |
2021 | 56.8 |
2022 - 2026 | 286.3 |
Postretirement Plans | |
Expected benefit payments [Abstract] | |
2017 | 15.4 |
2018 | 16.7 |
2019 | 17.9 |
2020 | 19.1 |
2021 | 20.1 |
2022 - 2026 | 108.6 |
Laclede Gas | Pension Plans | |
Expected benefit payments [Abstract] | |
2017 | 48.2 |
2018 | 43.3 |
2019 | 43.5 |
2020 | 42.2 |
2021 | 40.4 |
2022 - 2026 | 196.6 |
Laclede Gas | Postretirement Plans | |
Expected benefit payments [Abstract] | |
2017 | 12.3 |
2018 | 13.7 |
2019 | 14.8 |
2020 | 15.8 |
2021 | 16.8 |
2022 - 2026 | 92.5 |
Alagasco | Pension Plans | |
Expected benefit payments [Abstract] | |
2017 | 10.9 |
2018 | 10.6 |
2019 | 11.2 |
2020 | 11.9 |
2021 | 13.7 |
2022 - 2026 | 74.5 |
Alagasco | Postretirement Plans | |
Expected benefit payments [Abstract] | |
2017 | 2.9 |
2018 | 2.8 |
2019 | 2.8 |
2020 | 2.9 |
2021 | 2.9 |
2022 - 2026 | $ 14.1 |