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v3.23.1

Note 13 - Pension Plans and Other Postretirement Benefits (Tables) | 12 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Service cost – benefits earned during the period |  | $ | 20.0 |  |  | $ | 21.7 |  |  | $ | 22.5 |  |  | $ | 14.4 |  |  | $ | 15.4 |  |  | $ | 15.7 |  |  | $ | 4.8 |  |  | $ | 5.5 |  |  | $ | 6.1 |
Interest cost on projected benefit obligation |  |  | 21.5 |  |  |  | 20.7 |  |  |  | 22.6 |  |  |  | 14.7 |  |  |  | 14.2 |  |  |  | 15.8 |  |  |  | 4.7 |  |  |  | 4.6 |  |  |  | 4.9 |
Expected return on plan assets |  |  | (31.3 | ) |  |  | (31.6 | ) |  |  | (35.0 | ) |  |  | (22.7 | ) |  |  | (22.5 | ) |  |  | (24.6 | ) |  |  | (5.2 | ) |  |  | (5.8 | ) |  |  | (6.9 | )
Amortization of prior service (credit) cost |  |  | (4.5 | ) |  |  | (3.1 | ) |  |  | (2.5 | ) |  |  | (1.9 | ) |  |  | (0.6 | ) |  |  | 0.1 |  |  |  | (2.4 | ) |  |  | (2.3 | ) |  |  | (2.4 | )
Amortization of actuarial loss |  |  | 11.9 |  |  |  | 14.9 |  |  |  | 14.4 |  |  |  | 9.6 |  |  |  | 11.0 |  |  |  | 11.3 |  |  |  | 2.4 |  |  |  | 3.9 |  |  |  | 3.1 |
Loss on lump-sum settlements and curtailments |  |  | 33.6 |  |  |  | 18.2 |  |  |  | 31.6 |  |  |  | 27.3 |  |  |  | 11.6 |  |  |  | 26.6 |  |  |  | 6.3 |  |  |  | 6.6 |  |  |  | 5.0 |
Subtotal |  |  | 51.2 |  |  |  | 40.8 |  |  |  | 53.6 |  |  |  | 41.4 |  |  |  | 29.1 |  |  |  | 44.9 |  |  |  | 10.6 |  |  |  | 12.5 |  |  |  | 9.8 |
Regulatory adjustment |  |  | 12.5 |  |  |  | 20.6 |  |  |  | 6.6 |  |  |  | 9.9 |  |  |  | 19.0 |  |  |  | 3.9 |  |  |  | 1.7 |  |  |  | 0.7 |  |  |  | 1.8 |
Net pension cost |  | $ | 63.7 |  |  | $ | 61.4 |  |  | $ | 60.2 |  |  | $ | 51.3 |  |  | $ | 48.1 |  |  | $ | 48.8 |  |  | $ | 12.3 |  |  | $ | 13.2 |  |  | $ | 11.6 |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Service cost – benefits earned during the period |  | $ | 7.5 |  |  | $ | 7.3 |  |  | $ | 5.9 |  |  | $ | 6.3 |  |  | $ | 6.2 |  |  | $ | 5.3 |  |  | $ | 1.1 |  |  | $ | 0.9 |  |  | $ | 0.4 |
Interest cost on accumulated postretirement benefit obligation |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.3 |  |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 4.7 |  |  |  | 1.4 |  |  |  | 1.3 |  |  |  | 1.4 |
Expected return on plan assets |  |  | (16.8 | ) |  |  | (16.1 | ) |  |  | (16.7 | ) |  |  | (11.3 | ) |  |  | (10.9 | ) |  |  | (11.4 | ) |  |  | (5.2 | ) |  |  | (4.9 | ) |  |  | (5.0 | )
Amortization of prior service cost (credit) |  |  | 1.0 |  |  |  | 1.0 |  |  |  | (0.5 | ) |  |  | 0.7 |  |  |  | 0.7 |  |  |  | (0.2 | ) |  |  | 0.3 |  |  |  | 0.3 |  |  |  | (0.3 | )
Amortization of actuarial gain |  |  | (2.2 | ) |  |  | (1.6 | ) |  |  | (2.0 | ) |  |  | (1.9 | ) |  |  | (1.5 | ) |  |  | (2.0 | ) |  |  | — |  |  |  | — |  |  |  | — |
Subtotal |  |  | (4.5 | ) |  |  | (3.4 | ) |  |  | (7.0 | ) |  |  | (1.7 | ) |  |  | (1.0 | ) |  |  | (3.6 | ) |  |  | (2.4 | ) |  |  | (2.4 | ) |  |  | (3.5 | )
Regulatory adjustment |  |  | 3.3 |  |  |  | 13.2 |  |  |  | 16.0 |  |  |  | 5.0 |  |  |  | 15.0 |  |  |  | 17.7 |  |  |  | (1.8 | ) |  |  | (1.8 | ) |  |  | (1.8 | )
Net postretirement benefit (income) cost |  | $ | (1.2 | ) |  | $ | 9.8 |  |  | $ | 9.0 |  |  | $ | 3.3 |  |  | $ | 14.0 |  |  | $ | 14.1 |  |  | $ | (4.2 | ) |  | $ | (4.2 | ) |  | $ | (5.3 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Current year actuarial (gain) loss |  | $ | (16.9 | ) |  | $ | (8.1 | ) |  | $ | 68.0 |  |  | $ | 0.9 |  |  | $ | (0.9 | ) |  | $ | 37.8 |  |  | $ | (16.0 | ) |  | $ | (1.5 | ) |  | $ | 24.4 |
Amortization of actuarial loss |  |  | (11.9 | ) |  |  | (14.9 | ) |  |  | (14.4 | ) |  |  | (9.6 | ) |  |  | (11.0 | ) |  |  | (11.3 | ) |  |  | (2.4 | ) |  |  | (3.9 | ) |  |  | (3.1 | )
Acceleration of loss recognized due to settlement |  |  | (33.6 | ) |  |  | (18.2 | ) |  |  | (31.7 | ) |  |  | (27.3 | ) |  |  | (11.6 | ) |  |  | (26.6 | ) |  |  | (6.3 | ) |  |  | (6.6 | ) |  |  | (5.1 | )
Current year service credit |  |  | — |  |  |  | (17.9 | ) |  |  | (4.4 | ) |  |  | — |  |  |  | (17.9 | ) |  |  | (4.4 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service credit (cost) |  |  | 4.5 |  |  |  | 3.1 |  |  |  | 2.5 |  |  |  | 1.9 |  |  |  | 0.6 |  |  |  | (0.1 | ) |  |  | 2.4 |  |  |  | 2.3 |  |  |  | 2.4 |
Subtotal |  |  | (57.9 | ) |  |  | (56.0 | ) |  |  | 20.0 |  |  |  | (34.1 | ) |  |  | (40.8 | ) |  |  | (4.6 | ) |  |  | (22.3 | ) |  |  | (9.7 | ) |  |  | 18.6 |
Regulatory adjustment |  |  | 56.3 |  |  |  | 57.3 |  |  |  | (19.5 | ) |  |  | 32.5 |  |  |  | 42.1 |  |  |  | 5.1 |  |  |  | 22.3 |  |  |  | 9.7 |  |  |  | (18.6 | )
Total recognized in OCI |  | $ | (1.6 | ) |  | $ | 1.3 |  |  | $ | 0.5 |  |  | $ | (1.6 | ) |  | $ | 1.3 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Current year actuarial loss (gain) |  | $ | 15.8 |  |  | $ | (41.0 | ) |  | $ | (7.3 | ) |  | $ | 9.8 |  |  | $ | (29.0 | ) |  | $ | (7.6 | ) |  | $ | 5.9 |  |  | $ | (9.9 | ) |  | $ | 1.1 |
Amortization of actuarial gain |  |  | 2.2 |  |  |  | 1.6 |  |  |  | 2.0 |  |  |  | 1.9 |  |  |  | 1.5 |  |  |  | 2.0 |  |  |  | — |  |  |  | — |  |  |  | — |
Current year prior service (cost) credit |  |  | (6.3 | ) |  |  | — |  |  |  | 15.8 |  |  |  | (1.1 | ) |  |  | — |  |  |  | 9.5 |  |  |  | (5.2 | ) |  |  | — |  |  |  | 6.3 |
Amortization of prior service (cost) credit |  |  | (1.0 | ) |  |  | (1.0 | ) |  |  | 0.5 |  |  |  | (0.7 | ) |  |  | (0.7 | ) |  |  | 0.2 |  |  |  | (0.3 | ) |  |  | (0.3 | ) |  |  | 0.3 |
Subtotal |  |  | 10.7 |  |  |  | (40.4 | ) |  |  | 11.0 |  |  |  | 9.9 |  |  |  | (28.2 | ) |  |  | 4.1 |  |  |  | 0.4 |  |  |  | (10.2 | ) |  |  | 7.7 |
Regulatory adjustment |  |  | (10.7 | ) |  |  | 40.4 |  |  |  | (11.0 | ) |  |  | (9.9 | ) |  |  | 28.2 |  |  |  | (4.1 | ) |  |  | (0.4 | ) |  |  | 10.2 |  |  |  | (7.7 | )
Total recognized in OCI |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Benefit obligation, beginning of year |  | $ | 689.6 |  |  | $ | 732.6 |  |  | $ | 479.0 |  |  | $ | 505.2 |  |  | $ | 149.4 |  |  | $ | 163.5 |
Service cost |  |  | 20.0 |  |  |  | 21.7 |  |  |  | 14.4 |  |  |  | 15.4 |  |  |  | 4.8 |  |  |  | 5.5 |
Interest cost |  | 21.5 |  |  |  | 20.7 |  |  |  | 14.7 |  |  |  | 14.2 |  |  |  | 4.7 |  |  |  | 4.6 |
Actuarial (gain) loss |  |  | (173.9 | ) |  |  | 6.6 |  |  |  | (116.2 | ) |  |  | 11.0 |  |  |  | (42.4 | ) |  |  | (1.8 | )
Plan amendments |  |  | — |  |  |  | (17.9 | ) |  |  | — |  |  |  | (17.9 | ) |  |  | — |  |  |  | — |
Settlement loss |  |  | 33.4 |  |  |  | 12.3 |  |  |  | 27.9 |  |  |  | 8.2 |  |  |  | 5.6 |  |  |  | 4.1 |
Settlement benefits paid |  |  | (109.3 | ) |  |  | (67.6 | ) |  |  | (87.0 | ) |  |  | (44.6 | ) |  |  | (22.3 | ) |  |  | (22.9 | )
Regular benefits paid |  |  | (16.9 | ) |  |  | (18.8 | ) |  |  | (12.2 | ) |  |  | (12.5 | ) |  |  | (2.0 | ) |  |  | (3.6 | )
Benefit obligation, end of year |  | $ | 464.4 |  |  | $ | 689.6 |  |  | $ | 320.6 |  |  | $ | 479.0 |  |  | $ | 97.8 |  |  | $ | 149.4 |
Accumulated benefit obligation, end of year |  | $ | 457.1 |  |  | $ | 673.3 |  |  | $ | 315.0 |  |  | $ | 465.4 |  |  | $ | 96.2 |  |  | $ | 146.9 |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Benefit obligation, beginning of year |  | $ | 204.2 |  |  | $ | 212.3 |  |  | $ | 151.7 |  |  | $ | 158.4 |  |  | $ | 48.0 |  |  | $ | 48.3 |
Service cost |  |  | 7.5 |  |  |  | 7.3 |  |  |  | 6.3 |  |  |  | 6.2 |  |  |  | 1.1 |  |  |  | 0.9 |
Interest cost |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 1.4 |  |  |  | 1.3 |
Actuarial (gain) loss |  |  | (52.6 | ) |  |  | (7.5 | ) |  |  | (37.7 | ) |  |  | (6.7 | ) |  |  | (13.6 | ) |  |  | 0.7 |
Plan amendments |  |  | (6.2 | ) |  |  | — |  |  |  | (1.0 | ) |  |  | — |  |  |  | (5.2 | ) |  |  | — |
Retiree drug subsidy program |  |  | 0.2 |  |  |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (11.0 | ) |  |  | (13.9 | ) |  |  | (9.2 | ) |  |  | (10.7 | ) |  |  | (1.8 | ) |  |  | (3.2 | )
Benefit obligation, end of year |  | $ | 148.1 |  |  | $ | 204.2 |  |  | $ | 114.8 |  |  | $ | 151.7 |  |  | $ | 29.9 |  |  | $ | 48.0 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Fair value of plan assets, beginning of year |  | $ | 498.9 |  |  | $ | 473.1 |  |  | $ | 364.0 |  |  | $ | 336.2 |  |  | $ | 82.8 |  |  | $ | 88.6 |
Actual return on plan assets |  |  | (92.5 | ) |  |  | 58.8 |  |  |  | (66.7 | ) |  |  | 42.7 |  |  |  | (15.6 | ) |  |  | 9.6 |
Employer contributions |  |  | 52.4 |  |  |  | 53.4 |  |  |  | 37.8 |  |  |  | 42.2 |  |  |  | 14.4 |  |  |  | 11.1 |
Settlement benefits paid |  |  | (109.3 | ) |  |  | (67.6 | ) |  |  | (87.0 | ) |  |  | (44.6 | ) |  |  | (22.3 | ) |  |  | (22.9 | )
Regular benefits paid |  |  | (16.8 | ) |  |  | (18.8 | ) |  |  | (12.2 | ) |  |  | (12.5 | ) |  |  | (2.0 | ) |  |  | (3.6 | )
Fair value of plan assets, end of year |  | $ | 332.7 |  |  | $ | 498.9 |  |  | $ | 235.9 |  |  | $ | 364.0 |  |  | $ | 57.3 |  |  | $ | 82.8 |
Funded status of plans, end of year |  | $ | (131.7 | ) |  | $ | (190.7 | ) |  | $ | (84.7 | ) |  | $ | (115.0 | ) |  | $ | (40.5 | ) |  | $ | (66.6 | )
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Fair value of plan assets at beginning of year |  | $ | 326.9 |  |  | $ | 291.0 |  |  | $ | 221.7 |  |  | $ | 199.2 |  |  | $ | 99.4 |  |  | $ | 87.0 |
Actual return on plan assets |  |  | (51.6 | ) |  |  | 49.7 |  |  |  | (36.2 | ) |  |  | 33.1 |  |  |  | (14.3 | ) |  |  | 15.6 |
Employer contributions |  |  | 0.4 |  |  |  | 0.1 |  |  |  | 0.4 |  |  |  | 0.1 |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (11.0 | ) |  |  | (13.9 | ) |  |  | (9.2 | ) |  |  | (10.7 | ) |  |  | (1.8 | ) |  |  | (3.2 | )
Fair value of plan assets, end of year |  | $ | 264.7 |  |  | $ | 326.9 |  |  | $ | 176.7 |  |  | $ | 221.7 |  |  | $ | 83.3 |  |  | $ | 99.4 |
Funded status of plans, end of year |  | $ | 116.6 |  |  | $ | 122.7 |  |  | $ | 61.9 |  |  | $ | 70.0 |  |  | $ | 53.4 |  |  | $ | 51.4 |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Current liabilities |  | $ | (1.1 | ) |  | $ | (0.8 | ) |  | $ | (1.1 | ) |  | $ | (0.8 | ) |  | $ | — |  |  | $ | — |
Noncurrent liabilities |  |  | (130.6 | ) |  |  | (189.9 | ) |  |  | (83.6 | ) |  |  | (114.2 | ) |  |  | (40.5 | ) |  |  | (66.6 | )
Total |  | $ | (131.7 | ) |  | $ | (190.7 | ) |  | $ | (84.7 | ) |  | $ | (115.0 | ) |  | $ | (40.5 | ) |  | $ | (66.6 | )
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Noncurrent assets |  | $ | 151.6 |  |  | $ | 170.2 |  |  | $ | 96.9 |  |  | $ | 117.5 |  |  | $ | 53.4 |  |  | $ | 51.4 |
Current liabilities |  |  | (0.3 | ) |  |  | (0.5 | ) |  |  | (0.3 | ) |  |  | (0.5 | ) |  |  | — |  |  |  | — |
Noncurrent liabilities |  |  | (34.7 | ) |  |  | (47.0 | ) |  |  | (34.7 | ) |  |  | (47.0 | ) |  |  | — |  |  |  | — |
Total |  | $ | 116.6 |  |  | $ | 122.7 |  |  | $ | 61.9 |  |  | $ | 70.0 |  |  | $ | 53.4 |  |  | $ | 51.4 |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Net actuarial loss |  | $ | 132.0 |  |  | $ | 194.6 |  |  | $ | 93.6 |  |  | $ | 129.6 |  |  | $ | 41.2 |  |  | $ | 66.1 |
Prior service credit |  |  | (35.7 | ) |  |  | (40.3 | ) |  |  | (18.1 | ) |  |  | (20.1 | ) |  |  | (16.3 | ) |  |  | (18.7 | )
Subtotal |  |  | 96.3 |  |  |  | 154.3 |  |  |  | 75.5 |  |  |  | 109.5 |  |  |  | 24.9 |  |  |  | 47.4 |
Adjustments for amounts included in regulatory assets |  |  | (93.1 | ) |  |  | (149.5 | ) |  |  | (72.3 | ) |  |  | (104.7 | ) |  |  | (24.9 | ) |  |  | (47.4 | )
Total |  | $ | 3.2 |  |  | $ | 4.8 |  |  | $ | 3.2 |  |  | $ | 4.8 |  |  | $ | — |  |  | $ | — |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Net actuarial gain |  | $ | (83.3 | ) |  | $ | (101.2 | ) |  | $ | (74.2 | ) |  | $ | (85.8 | ) |  | $ | (5.6 | ) |  | $ | (11.5 | )
Prior service cost (credit) |  |  | 7.1 |  |  |  | 14.6 |  |  |  | 7.9 |  |  |  | 9.7 |  |  |  | (0.8 | ) |  |  | 4.9 |
Subtotal |  |  | (76.2 | ) |  |  | (86.6 | ) |  |  | (66.3 | ) |  |  | (76.1 | ) |  |  | (6.4 | ) |  |  | (6.6 | )
Adjustments for amounts included in regulatory assets |  |  | 76.2 |  |  |  | 86.6 |  |  |  | 66.3 |  |  |  | 76.1 |  |  |  | 6.4 |  |  |  | 6.6 |
Total |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Weighted average discount rate - Spire Missouri East plan |  |  | 3.00% |  |  |  | 2.85% |  |  |  | 3.20% |
Weighted average discount rate - Spire Missouri West plan |  |  | 3.00% |  |  |  | 2.75% |  |  |  | 3.15% |
Weighted average rate of future compensation increase |  |  | 3.00% |  |  |  | 3.00% |  |  |  | 3.00% |
Expected long-term rate of return on plan assets |  |  | 6.75% |  |  |  | 6.75% |  |  |  | 7.25% |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Weighted average discount rate |  |  | 3.10%/3.0% |  |  |  | 2.95%/2.80% |  |  |  | 3.25%/3.20% |
Weighted average rate of future compensation increase |  |  | 3.00% |  |  |  | 3.00% |  |  |  | 3.00% |
Expected long-term rate of return on plan assets |  |  | 6.75% |  |  |  | 6.75% |  |  |  | 7.25% |
|  | 2022 |  |  | 2021 |
Weighted average discount rate - Spire Missouri East plan |  |  | 5.70% |  |  |  | 3.00% |
Weighted average discount rate - Spire Missouri West plan |  |  | 5.80% |  |  |  | 3.00% |
Weighted average discount rate - Spire Alabama plans |  |  | 5.70%/5.65% |  |  |  | 3.1%/3.0% |
Weighted average rate of future compensation increase |  |  | 3.00% |  |  |  | 3.00% |
Cash balance interest crediting rate - Spire Alabama / Spire Missouri |  |  | 4.25% |  |  |  | 4.25% |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Weighted average discount rate - Spire Missouri plans |  |  | 2.95% |  |  |  | 2.75% |  |  |  | 3.15% |
Weighted average rate of future compensation increase |  |  | 3.00% |  |  |  | 3.00% |  |  |  | 3.00% |
Expected long-term rate of return on plan assets - Spire Missouri plans |  |  | 5.75% |  |  |  | 5.75% |  |  |  | 6.25% |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Weighted average discount rate |  |  | 2.95% |  |  |  | 2.75% |  |  |  | 3.15% |
Expected long-term rate of return on plan assets |  | 5.00%/6.25% |  |  | 5.00%/6.25% |  |  | 5.00%/6.25% |
|  | 2022 |  |  | 2021 |
Weighted average discount rate - Spire Alabama plans |  |  | 5.80% |  |  |  | 2.95% |
Weighted average discount rate - Spire Missouri plans |  |  | 5.80% |  |  |  | 2.95% |
Weighted average rate of future compensation increase - Spire Missouri East plans |  |  | 3.00% |  |  |  | 3.00% |
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Projected benefit obligation |  | $ | 464.4 |  |  | $ | 689.6 |  |  | $ | 320.6 |  |  | $ | 479.0 |  |  | $ | 97.8 |  |  | $ | 149.4 |
Accumulated benefit obligation |  |  | 457.1 |  |  |  | 673.3 |  |  |  | 315.0 |  |  |  | 465.4 |  |  |  | 96.2 |  |  |  | 146.9 |
Fair value of plan assets |  |  | 332.7 |  |  |  | 498.9 |  |  |  | 235.9 |  |  |  | 364.0 |  |  |  | 57.3 |  |  |  | 82.8 |
Schedule of Allocation of Plan Assets [Table Text Block] |
Spire Missouri |  | 2022 Target |  |  | 2022 Actual |  |  | 2021 Target |  |  | 2021 Actual |
Return seeking assets |  |  | 70.0 | % |  |  | 74.3 | % |  |  | 70.0 | % |  |  | 74.5 | %
Liability hedging assets |  |  | 30.0 | % |  |  | 22.8 | % |  |  | 30.0 | % |  |  | 23.1 | %
Cash and cash equivalents |  |  | — | % |  |  | 2.9 | % |  |  | — | % |  |  | 2.4 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Spire Alabama |  | 2022 Target |  |  | 2022 Actual |  |  | 2021 Target |  |  | 2021 Actual |
Return seeking assets |  |  | 70.0 | % |  |  | 68.7 | % |  |  | 70.0 | % |  |  | 72.8 | %
Liability hedging assets |  |  | 30.0 | % |  |  | 25.3 | % |  |  | 30.0 | % |  |  | 25.5 | %
Cash and cash equivalents |  |  | — | % |  |  | 6.0 | % |  |  | — | % |  |  | 1.7 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Spire Missouri |  | Target |  |  | 2022 Actual |  |  | 2021 Actual |
Equity securities |  |  | 60.0 | % |  |  | 58.7 | % |  |  | 59.2 | %
Debt securities |  |  | 40.0 | % |  |  | 40.5 | % |  |  | 38.9 | %
Cash and cash equivalents |  |  | — | % |  |  | 0.8 | % |  |  | 1.9 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Spire Alabama |  | Target |  |  | 2022 Actual |  |  | 2021 Actual |
Equity securities |  |  | 60.5 | % |  |  | 57.7 | % |  |  | 60.5 | %
Debt securities |  |  | 39.5 | % |  |  | 42.3 | % |  |  | 39.5 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Schedule of Expected Benefit Payments [Table Text Block] |
|  | 2023 |  |  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  |  | 2028- 2032 |
Spire |  | $ | 55.8 |  |  | $ | 52.3 |  |  | $ | 47.2 |  |  | $ | 44.0 |  |  | $ | 43.5 |  |  | $ | 202.9 |
Spire Missouri |  |  | 41.4 |  |  |  | 38.9 |  |  |  | 33.9 |  |  |  | 30.8 |  |  |  | 29.6 |  |  |  | 137.5 |
Spire Alabama |  |  | 11.3 |  |  |  | 10.2 |  |  |  | 9.9 |  |  |  | 9.7 |  |  |  | 10.4 |  |  |  | 46.4 |
|  | 2023 |  |  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  |  | 2028 - 2032 |
Spire |  | $ | 13.7 |  |  | $ | 14.4 |  |  | $ | 14.6 |  |  | $ | 14.5 |  |  | $ | 14.7 |  |  | $ | 69.5 |
Spire Missouri |  |  | 11.6 |  |  |  | 12.2 |  |  |  | 12.3 |  |  |  | 12.2 |  |  |  | 12.2 |  |  |  | 55.7 |
Spire Alabama |  |  | 1.9 |  |  |  | 2.0 |  |  |  | 2.1 |  |  |  | 2.1 |  |  |  | 2.2 |  |  |  | 11.9 |
Schedule of Health Care Cost Trend Rates [Table Text Block] |
|  | 2022 |  |  | 2021 |
Medical cost trend assumed for next year - Spire Missouri |  |  | 6.75% |  |  |  | 7.00% |
Medical cost trend assumed for next year - Spire Alabama |  |  | 6.75% |  |  |  | 7.00% |
Rate to which the medical cost trend rate is assumed to decline (the ultimate medical cost trend rate) |  |  | 5.00% |  |  |  | 5.00% |
Year the rate reaches the ultimate trend |  |  | 2028 |  |  |  | 2028 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Quoted Prices |  |  | Significant |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 11.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 11.5 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 122.2 |  |  |  | — |  |  |  | 122.2 |
Real asset funds |  |  | — |  |  |  | 61.0 |  |  |  | — |  |  |  | 61.0 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 42.3 |  |  |  | — |  |  |  | — |  |  |  | 42.3 |
U.S. government index funds |  |  | 36.1 |  |  |  | — |  |  |  | — |  |  |  | 36.1 |
Global funds (including U.S.) |  |  | — |  |  |  | 59.6 |  |  |  | — |  |  |  | 59.6 |
Total |  | $ | 89.9 |  |  | $ | 242.8 |  |  | $ | — |  |  | $ | 332.7 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 10.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 10.6 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 201.2 |  |  |  | — |  |  |  | 201.2 |
Real asset funds |  |  | — |  |  |  | 87.7 |  |  |  | — |  |  |  | 87.7 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 58.4 |  |  |  | — |  |  |  | — |  |  |  | 58.4 |
U.S. government index funds |  |  | 60.1 |  |  |  | — |  |  |  | — |  |  |  | 60.1 |
Global funds (including U.S.) |  |  | — |  |  |  | 80.9 |  |  |  | — |  |  |  | 80.9 |
Total |  | $ | 129.1 |  |  | $ | 369.8 |  |  | $ | — |  |  | $ | 498.9 |
|  | Quoted Prices |  |  | Significant |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 3.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 3.5 |
U.S. stock/bond mutual funds |  |  | 177.1 |  |  |  | 69.4 |  |  |  | — |  |  |  | 246.5 |
International fund |  |  | 0.8 |  |  |  | 13.9 |  |  |  | — |  |  |  | 14.7 |
Total |  | $ | 181.4 |  |  | $ | 83.3 |  |  | $ | — |  |  | $ | 264.7 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 3.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 3.1 |
U.S. stock/bond mutual funds |  |  | 223.2 |  |  |  | 82.5 |  |  |  | — |  |  |  | 305.7 |
International fund |  |  | 1.2 |  |  |  | 16.9 |  |  |  | — |  |  |  | 18.1 |
Total |  | $ | 227.5 |  |  | $ | 99.4 |  |  | $ | — |  |  | $ | 326.9 |
|  | Quoted Prices |  |  | Significant |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 5.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 5.7 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 85.7 |  |  |  | — |  |  |  | 85.7 |
Real asset funds |  |  | — |  |  |  | 47.2 |  |  |  | — |  |  |  | 47.2 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 29.4 |  |  |  | — |  |  |  | — |  |  |  | 29.4 |
U.S. government index funds |  |  | 24.6 |  |  |  | — |  |  |  | — |  |  |  | 24.6 |
Global funds (including U.S.) |  |  | — |  |  |  | 43.3 |  |  |  | — |  |  |  | 43.3 |
Total |  | $ | 59.7 |  |  | $ | 176.2 |  |  | $ | — |  |  | $ | 235.9 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 8.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 8.3 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 148.6 |  |  |  | — |  |  |  | 148.6 |
Real asset funds |  |  | — |  |  |  | 59.2 |  |  |  | — |  |  |  | 59.2 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 38.4 |  |  |  | — |  |  |  | — |  |  |  | 38.4 |
U.S. government index funds |  |  | 45.6 |  |  |  | — |  |  |  | — |  |  |  | 45.6 |
Global funds (including U.S.) |  |  | — |  |  |  | 63.9 |  |  |  | — |  |  |  | 63.9 |
Total |  | $ | 92.3 |  |  | $ | 271.7 |  |  | $ | — |  |  | $ | 364.0 |
|  | Quoted Prices |  |  | Significant |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.7 |
U.S. stock/bond mutual funds |  |  | 174.0 |  |  |  | — |  |  |  | — |  |  |  | 174.0 |
Total |  | $ | 176.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 176.7 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.4 |
U.S. stock/bond mutual funds |  |  | 219.3 |  |  |  | — |  |  |  | — |  |  |  | 219.3 |
Total |  | $ | 221.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 221.7 |
|  | Quoted Prices |  |  | Significant |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 3.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 3.5 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 21.6 |  |  |  | — |  |  |  | 21.6 |
Real asset funds |  |  | — |  |  |  | 8.1 |  |  |  | — |  |  |  | 8.1 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 7.7 |  |  |  | — |  |  |  | — |  |  |  | 7.7 |
U.S. government index funds |  |  | 6.8 |  |  |  | — |  |  |  | — |  |  |  | 6.8 |
Global funds (including U.S.) |  |  | — |  |  |  | 9.6 |  |  |  | — |  |  |  | 9.6 |
Total |  | $ | 18.0 |  |  | $ | 39.3 |  |  | $ | — |  |  | $ | 57.3 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 1.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 1.4 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 32.3 |  |  |  | — |  |  |  | 32.3 |
Real asset funds |  |  | — |  |  |  | 14.6 |  |  |  | — |  |  |  | 14.6 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 12.3 |  |  |  | — |  |  |  | — |  |  |  | 12.3 |
U.S. government index funds |  |  | 8.9 |  |  |  | — |  |  |  | — |  |  |  | 8.9 |
Global funds (including U.S.) |  |  | — |  |  |  | 13.3 |  |  |  | — |  |  |  | 13.3 |
Total |  | $ | 22.6 |  |  | $ | 60.2 |  |  | $ | — |  |  | $ | 82.8 |
|  | Quoted Prices |  |  | Significant |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  | Unobservable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. stock/bond mutual funds |  | $ | — |  |  | $ | 69.4 |  |  | $ | — |  |  | $ | 69.4 |
International fund |  |  | — |  |  |  | 13.9 |  |  |  | — |  |  |  | 13.9 |
Total |  | $ | — |  |  | $ | 83.3 |  |  | $ | — |  |  | $ | 83.3 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. stock/bond mutual funds |  | $ | — |  |  | $ | 82.5 |  |  | $ | — |  |  | $ | 82.5 |
International fund |  |  | — |  |  |  | 16.9 |  |  |  | — |  |  |  | 16.9 |
Total |  | $ | — |  |  | $ | 99.4 |  |  | $ | — |  |  | $ | 99.4 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (b) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (l) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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