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v3.23.3

Note 13 - Pension Plans and Other Postretirement Benefits (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Service cost – benefits earned during the period |  | $ | 16.3 |  |  | $ | 20.0 |  |  | $ | 21.7 |  |  | $ | 11.4 |  |  | $ | 14.4 |  |  | $ | 15.4 |  |  | $ | 4.2 |  |  | $ | 4.8 |  |  | $ | 5.5 |
Interest cost on projected benefit obligation |  |  | 25.1 |  |  |  | 21.5 |  |  |  | 20.7 |  |  |  | 17.8 |  |  |  | 14.7 |  |  |  | 14.2 |  |  |  | 4.8 |  |  |  | 4.7 |  |  |  | 4.6 |
Expected return on plan assets |  |  | (24.5 | ) |  |  | (31.3 | ) |  |  | (31.6 | ) |  |  | (18.0 | ) |  |  | (22.7 | ) |  |  | (22.5 | ) |  |  | (3.5 | ) |  |  | (5.2 | ) |  |  | (5.8 | )
Amortization of prior service credit |  |  | (4.5 | ) |  |  | (4.5 | ) |  |  | (3.1 | ) |  |  | (1.9 | ) |  |  | (1.9 | ) |  |  | (0.6 | ) |  |  | (2.4 | ) |  |  | (2.4 | ) |  |  | (2.3 | )
Amortization of actuarial loss |  |  | 6.6 |  |  |  | 11.9 |  |  |  | 14.9 |  |  |  | 6.1 |  |  |  | 9.6 |  |  |  | 11.0 |  |  |  | 0.9 |  |  |  | 2.4 |  |  |  | 3.9 |
Loss on lump-sum settlements and curtailments |  |  | 9.7 |  |  |  | 33.6 |  |  |  | 18.2 |  |  |  | 0.6 |  |  |  | 27.3 |  |  |  | 11.6 |  |  |  | 9.1 |  |  |  | 6.3 |  |  |  | 6.6 |
Subtotal |  |  | 28.7 |  |  |  | 51.2 |  |  |  | 40.8 |  |  |  | 16.0 |  |  |  | 41.4 |  |  |  | 29.1 |  |  |  | 13.1 |  |  |  | 10.6 |  |  |  | 12.5 |
Regulatory adjustment |  |  | 26.3 |  |  |  | 12.5 |  |  |  | 20.6 |  |  |  | 27.1 |  |  |  | 9.9 |  |  |  | 19.0 |  |  |  | (1.7 | ) |  |  | 1.7 |  |  |  | 0.7 |
Net pension cost |  | $ | 55.0 |  |  | $ | 63.7 |  |  | $ | 61.4 |  |  | $ | 43.1 |  |  | $ | 51.3 |  |  | $ | 48.1 |  |  | $ | 11.4 |  |  | $ | 12.3 |  |  | $ | 13.2 |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Service cost – benefits earned during the period |  | $ | 4.8 |  |  | $ | 7.5 |  |  | $ | 7.3 |  |  | $ | 4.0 |  |  | $ | 6.3 |  |  | $ | 6.2 |  |  | $ | 0.7 |  |  | $ | 1.1 |  |  | $ | 0.9 |
Interest cost on accumulated postretirement benefit obligation |  |  | 8.5 |  |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.5 |  |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 1.8 |  |  |  | 1.4 |  |  |  | 1.3 |
Expected return on plan assets |  |  | (15.8 | ) |  |  | (16.8 | ) |  |  | (16.1 | ) |  |  | (10.5 | ) |  |  | (11.3 | ) |  |  | (10.9 | ) |  |  | (5.0 | ) |  |  | (5.2 | ) |  |  | (4.9 | )
Amortization of prior service cost (credit) |  |  | 0.3 |  |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 0.6 |  |  |  | 0.7 |  |  |  | 0.7 |  |  |  | (0.3 | ) |  |  | 0.3 |  |  |  | 0.3 |
Amortization of actuarial gain |  |  | (4.0 | ) |  |  | (2.2 | ) |  |  | (1.6 | ) |  |  | (3.2 | ) |  |  | (1.9 | ) |  |  | (1.5 | ) |  |  | (0.5 | ) |  |  | — |  |  |  | — |
Subtotal |  |  | (6.2 | ) |  |  | (4.5 | ) |  |  | (3.4 | ) |  |  | (2.6 | ) |  |  | (1.7 | ) |  |  | (1.0 | ) |  |  | (3.3 | ) |  |  | (2.4 | ) |  |  | (2.4 | )
Regulatory adjustment |  |  | 0.6 |  |  |  | 3.3 |  |  |  | 13.2 |  |  |  | 1.8 |  |  |  | 5.0 |  |  |  | 15.0 |  |  |  | (1.3 | ) |  |  | (1.8 | ) |  |  | (1.8 | )
Net postretirement benefit (income) cost |  | $ | (5.6 | ) |  | $ | (1.2 | ) |  | $ | 9.8 |  |  | $ | (0.8 | ) |  | $ | 3.3 |  |  | $ | 14.0 |  |  | $ | (4.6 | ) |  | $ | (4.2 | ) |  | $ | (4.2 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Current year actuarial loss (gain) |  | $ | 14.5 |  |  | $ | (16.9 | ) |  | $ | (8.1 | ) |  | $ | 5.7 |  |  | $ | 0.9 |  |  | $ | (0.9 | ) |  | $ | 9.0 |  |  | $ | (16.0 | ) |  | $ | (1.5 | )
Amortization of actuarial loss |  |  | (6.6 | ) |  |  | (11.9 | ) |  |  | (14.9 | ) |  |  | (6.1 | ) |  |  | (9.6 | ) |  |  | (11.0 | ) |  |  | (0.9 | ) |  |  | (2.4 | ) |  |  | (3.9 | )
Acceleration of loss recognized due to settlement |  |  | (9.7 | ) |  |  | (33.6 | ) |  |  | (18.2 | ) |  |  | (0.6 | ) |  |  | (27.3 | ) |  |  | (11.6 | ) |  |  | (9.1 | ) |  |  | (6.3 | ) |  |  | (6.6 | )
Current year service credit |  |  | — |  |  |  | — |  |  |  | (17.9 | ) |  |  | — |  |  |  | — |  |  |  | (17.9 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service credit |  |  | 4.5 |  |  |  | 4.5 |  |  |  | 3.1 |  |  |  | 1.9 |  |  |  | 1.9 |  |  |  | 0.6 |  |  |  | 2.4 |  |  |  | 2.4 |  |  |  | 2.3 |
Subtotal |  |  | 2.7 |  |  |  | (57.9 | ) |  |  | (56.0 | ) |  |  | 0.9 |  |  |  | (34.1 | ) |  |  | (40.8 | ) |  |  | 1.4 |  |  |  | (22.3 | ) |  |  | (9.7 | )
Regulatory adjustment |  |  | (2.8 | ) |  |  | 56.3 |  |  |  | 57.3 |  |  |  | (1.0 | ) |  |  | 32.5 |  |  |  | 42.1 |  |  |  | (1.4 | ) |  |  | 22.3 |  |  |  | 9.7 |
Total recognized in OCI |  | $ | (0.1 | ) |  | $ | (1.6 | ) |  | $ | 1.3 |  |  | $ | (0.1 | ) |  | $ | (1.6 | ) |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Current year actuarial (gain) loss |  | $ | (24.4 | ) |  | $ | 15.8 |  |  | $ | (41.0 | ) |  | $ | (21.5 | ) |  | $ | 9.8 |  |  | $ | (29.0 | ) |  | $ | (1.1 | ) |  | $ | 5.9 |  |  | $ | (9.9 | )
Amortization of actuarial gain |  |  | 4.0 |  |  |  | 2.2 |  |  |  | 1.6 |  |  |  | 3.2 |  |  |  | 1.9 |  |  |  | 1.5 |  |  |  | 0.5 |  |  |  | — |  |  |  | — |
Current year prior service cost |  |  | — |  |  |  | (6.3 | ) |  |  | — |  |  |  |  |  |  |  | (1.1 | ) |  |  | — |  |  |  | — |  |  |  | (5.2 | ) |  |  | — |
Amortization of prior service (cost) credit |  |  | (0.3 | ) |  |  | (1.0 | ) |  |  | (1.0 | ) |  |  | (0.6 | ) |  |  | (0.7 | ) |  |  | (0.7 | ) |  |  | 0.3 |  |  |  | (0.3 | ) |  |  | (0.3 | )
Subtotal |  |  | (20.7 | ) |  |  | 10.7 |  |  |  | (40.4 | ) |  |  | (18.9 | ) |  |  | 9.9 |  |  |  | (28.2 | ) |  |  | (0.3 | ) |  |  | 0.4 |  |  |  | (10.2 | )
Regulatory adjustment |  |  | 20.7 |  |  |  | (10.7 | ) |  |  | 40.4 |  |  |  | 18.9 |  |  |  | (9.9 | ) |  |  | 28.2 |  |  |  | 0.3 |  |  |  | (0.4 | ) |  |  | 10.2 |
Total recognized in OCI |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Schedule of Accumulated and Projected Benefit Obligations [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Benefit obligation, beginning of year |  | $ | 464.4 |  |  | $ | 689.6 |  |  | $ | 320.6 |  |  | $ | 479.0 |  |  | $ | 97.8 |  |  | $ | 149.4 |
Service cost |  |  | 16.3 |  |  |  | 20.0 |  |  |  | 11.4 |  |  |  | 14.4 |  |  |  | 4.2 |  |  |  | 4.8 |
Interest cost |  |  | 25.1 |  |  |  | 21.5 |  |  |  | 17.8 |  |  |  | 14.7 |  |  |  | 4.8 |  |  |  | 4.7 |
Actuarial (gain) loss |  |  | (1.1 | ) |  |  | (173.9 | ) |  |  | (4.9 | ) |  |  | (116.2 | ) |  |  | 5.4 |  |  |  | (42.4 | )
Settlement loss |  |  | 9.7 |  |  |  | 33.4 |  |  |  | 0.6 |  |  |  | 27.9 |  |  |  | 9.1 |  |  |  | 5.6 |
Settlement benefits paid |  |  | (48.8 | ) |  |  | (109.3 | ) |  |  | (9.9 | ) |  |  | (87.0 | ) |  |  | (38.8 | ) |  |  | (22.3 | )
Regular benefits paid |  |  | (26.9 | ) |  |  | (16.9 | ) |  |  | (22.4 | ) |  |  | (12.2 | ) |  |  | (1.9 | ) |  |  | (2.0 | )
Benefit obligation, end of year |  | $ | 438.7 |  |  | $ | 464.4 |  |  | $ | 313.2 |  |  | $ | 320.6 |  |  | $ | 80.6 |  |  | $ | 97.8 |
Accumulated benefit obligation, end of year |  | $ | 433.1 |  |  | $ | 457.1 |  |  | $ | 309.5 |  |  | $ | 315.0 |  |  | $ | 78.8 |  |  | $ | 96.2 |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Benefit obligation, beginning of year |  | $ | 148.1 |  |  | $ | 204.2 |  |  | $ | 114.8 |  |  | $ | 151.7 |  |  | $ | 29.9 |  |  | $ | 48.0 |
Service cost |  |  | 4.8 |  |  |  | 7.5 |  |  |  | 4.0 |  |  |  | 6.3 |  |  |  | 0.7 |  |  |  | 1.1 |
Interest cost |  |  | 8.5 |  |  |  | 6.0 |  |  |  | 6.5 |  |  |  | 4.5 |  |  |  | 1.8 |  |  |  | 1.4 |
Actuarial (gain) loss |  |  | (10.6 | ) |  |  | (52.6 | ) |  |  | (13.4 | ) |  |  | (37.7 | ) |  |  | 4.2 |  |  |  | (13.6 | )
Plan amendments |  |  | — |  |  |  | (6.2 | ) |  |  | — |  |  |  | (1.0 | ) |  |  | — |  |  |  | (5.2 | )
Retiree drug subsidy program |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.2 |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (8.4 | ) |  |  | (11.0 | ) |  |  | (6.8 | ) |  |  | (9.2 | ) |  |  | (1.5 | ) |  |  | (1.8 | )
Benefit obligation, end of year |  | $ | 142.6 |  |  | $ | 148.1 |  |  | $ | 105.3 |  |  | $ | 114.8 |  |  | $ | 35.1 |  |  | $ | 29.9 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Fair value of plan assets, beginning of year |  | $ | 332.7 |  |  | $ | 498.9 |  |  | $ | 235.9 |  |  | $ | 364.0 |  |  | $ | 57.3 |  |  | $ | 82.8 |
Actual return on plan assets |  |  | 9.1 |  |  |  | (92.5 | ) |  |  | 7.5 |  |  |  | (66.7 | ) |  |  | — |  |  |  | (15.6 | )
Employer contributions |  |  | 58.9 |  |  |  | 52.4 |  |  |  | 30.3 |  |  |  | 37.8 |  |  |  | 27.9 |  |  |  | 14.4 |
Settlement benefits paid |  |  | (39.1 | ) |  |  | (109.3 | ) |  |  | (9.3 | ) |  |  | (87.0 | ) |  |  | (29.7 | ) |  |  | (22.3 | )
Regular benefits paid |  |  | (26.9 | ) |  |  | (16.8 | ) |  |  | (22.4 | ) |  |  | (12.2 | ) |  |  | (1.9 | ) |  |  | (2.0 | )
Fair value of plan assets, end of year |  | $ | 334.7 |  |  | $ | 332.7 |  |  | $ | 242.0 |  |  | $ | 235.9 |  |  | $ | 53.6 |  |  | $ | 57.3 |
Funded status of plans, end of year |  | $ | (104.0 | ) |  | $ | (131.7 | ) |  | $ | (71.2 | ) |  | $ | (84.7 | ) |  | $ | (27.0 | ) |  | $ | (40.5 | )
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Fair value of plan assets at beginning of year |  | $ | 264.7 |  |  | $ | 326.9 |  |  | $ | 176.7 |  |  | $ | 221.7 |  |  | $ | 83.3 |  |  | $ | 99.4 |
Actual return on plan assets |  |  | 29.9 |  |  |  | (51.6 | ) |  |  | 18.8 |  |  |  | (36.2 | ) |  |  | 10.2 |  |  |  | (14.3 | )
Employer contributions |  |  | 0.1 |  |  |  | 0.4 |  |  |  | 0.1 |  |  |  | 0.4 |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (8.4 | ) |  |  | (11.0 | ) |  |  | (6.8 | ) |  |  | (9.2 | ) |  |  | (1.5 | ) |  |  | (1.8 | )
Fair value of plan assets, end of year |  | $ | 286.3 |  |  | $ | 264.7 |  |  | $ | 188.8 |  |  | $ | 176.7 |  |  | $ | 92.0 |  |  | $ | 83.3 |
Funded status of plans, end of year |  | $ | 143.7 |  |  | $ | 116.6 |  |  | $ | 83.5 |  |  | $ | 61.9 |  |  | $ | 56.9 |  |  | $ | 53.4 |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Current liabilities |  | $ | (1.6 | ) |  | $ | (1.1 | ) |  | $ | (1.6 | ) |  | $ | (1.1 | ) |  | $ | — |  |  | $ | — |
Noncurrent liabilities |  |  | (102.4 | ) |  |  | (130.6 | ) |  |  | (69.6 | ) |  |  | (83.6 | ) |  |  | (27.0 | ) |  |  | (40.5 | )
Total |  | $ | (104.0 | ) |  | $ | (131.7 | ) |  | $ | (71.2 | ) |  | $ | (84.7 | ) |  | $ | (27.0 | ) |  | $ | (40.5 | )
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Noncurrent assets |  | $ | 180.7 |  |  | $ | 151.6 |  |  | $ | 120.5 |  |  | $ | 96.9 |  |  | $ | 56.9 |  |  | $ | 53.4 |
Current liabilities |  |  | (0.4 | ) |  |  | (0.3 | ) |  |  | (0.4 | ) |  |  | (0.3 | ) |  |  | — |  |  |  | — |
Noncurrent liabilities |  |  | (36.6 | ) |  |  | (34.7 | ) |  |  | (36.6 | ) |  |  | (34.7 | ) |  |  | — |  |  |  | — |
Total |  | $ | 143.7 |  |  | $ | 116.6 |  |  | $ | 83.5 |  |  | $ | 61.9 |  |  | $ | 56.9 |  |  | $ | 53.4 |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net actuarial loss |  | $ | 130.1 |  |  | $ | 132.0 |  |  | $ | 92.5 |  |  | $ | 93.6 |  |  | $ | 40.2 |  |  | $ | 41.2 |
Prior service credit |  |  | (31.2 | ) |  |  | (35.7 | ) |  |  | (16.2 | ) |  |  | (18.1 | ) |  |  | (13.9 | ) |  |  | (16.3 | )
Subtotal |  |  | 98.9 |  |  |  | 96.3 |  |  |  | 76.3 |  |  |  | 75.5 |  |  |  | 26.3 |  |  |  | 24.9 |
Adjustments for amounts included in regulatory assets |  |  | (95.9 | ) |  |  | (93.1 | ) |  |  | (73.3 | ) |  |  | (72.3 | ) |  |  | (26.3 | ) |  |  | (24.9 | )
Total |  | $ | 3.0 |  |  | $ | 3.2 |  |  | $ | 3.0 |  |  | $ | 3.2 |  |  | $ | — |  |  | $ | — |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net actuarial gain |  | $ | (103.3 | ) |  | $ | (83.3 | ) |  | $ | (92.3 | ) |  | $ | (74.2 | ) |  | $ | (6.1 | ) |  | $ | (5.6 | )
Prior service cost (credit) |  |  | 7.0 |  |  |  | 7.1 |  |  |  | 7.4 |  |  |  | 7.9 |  |  |  | (0.4 | ) |  |  | (0.8 | )
Subtotal |  |  | (96.3 | ) |  |  | (76.2 | ) |  |  | (84.9 | ) |  |  | (66.3 | ) |  |  | (6.5 | ) |  |  | (6.4 | )
Adjustments for amounts included in regulatory assets |  |  | 96.3 |  |  |  | 76.2 |  |  |  | 84.9 |  |  |  | 66.3 |  |  |  | 6.5 |  |  |  | 6.4 |
Total |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Weighted average discount rate - Spire Missouri East plan |  |  | 5.70% |  |  |  | 3.00% |  |  |  | 2.85% |
Weighted average discount rate - Spire Missouri West plan |  |  | 5.80% |  |  |  | 3.00% |  |  |  | 2.75% |
Weighted average rate of future compensation increase |  |  | 3.00% |  |  |  | 3.00% |  |  |  | 3.00% |
Expected long-term rate of return on plan assets |  |  | 6.50% |  |  |  | 6.75% |  |  |  | 6.75% |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Weighted average discount rate |  | 5.65%/5.7% |  |  | 3.10%/3.0% |  |  | 2.95%/2.80% |
Weighted average rate of future compensation increase |  |  | 3.00% |  |  |  | 3.00% |  |  |  | 3.00% |
Expected long-term rate of return on plan assets |  |  | 6.50% |  |  |  | 6.75% |  |  |  | 6.75% |
|  | 2023 |  |  | 2022 |
Weighted average discount rate - Spire Missouri East plan |  |  | 6.25% |  |  |  | 5.70% |
Weighted average discount rate - Spire Missouri West plan |  |  | 6.30% |  |  |  | 5.80% |
Weighted average discount rate - Spire Alabama plans |  | 6.2%/6.25% |  |  | 5.70%/5.65% |
Weighted average rate of future compensation increase |  |  | 3.00% |  |  |  | 3.00% |
Cash balance interest crediting rate - Spire Alabama / Spire Missouri |  |  | 4.25% |  |  |  | 4.25% |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Weighted average discount rate - Spire Missouri plans |  |  | 5.80% |  |  |  | 2.95% |  |  |  | 2.75% |
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 |  |  | 5.50% |  |  |  | 5.75% |  |  |  | 5.75% |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Weighted average discount rate |  |  | 5.80% |  |  |  | 2.95% |  |  |  | 2.75% |
Expected long-term rate of return on plan assets |  | 4.75%/6.0% |  |  | 5.00%/6.25% |  |  | 5.00%/6.25% |
|  | 2023 |  |  | 2022 |
Weighted average discount rate - Spire Alabama plans and Spire Missouri Plans |  |  | 6.30% |  |  |  | 5.80% |
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 |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Projected benefit obligation |  | $ | 438.7 |  |  | $ | 464.4 |  |  | $ | 313.2 |  |  | $ | 320.6 |  |  | $ | 80.6 |  |  | $ | 97.8 |
Accumulated benefit obligation |  |  | 433.1 |  |  |  | 457.1 |  |  |  | 309.5 |  |  |  | 315.0 |  |  |  | 78.8 |  |  |  | 96.2 |
Fair value of plan assets |  |  | 334.7 |  |  |  | 332.7 |  |  |  | 242.0 |  |  |  | 235.9 |  |  |  | 53.6 |  |  |  | 57.3 |
Schedule of Allocation of Plan Assets [Table Text Block] |
Spire Missouri |  | 2023 Target |  |  | 2023 Actual |  |  | 2022 Target |  |  | 2022 Actual |
Return seeking assets |  |  | 70.0 | % |  |  | 77.0 | % |  |  | 70.0 | % |  |  | 74.3 | %
Liability hedging assets |  |  | 30.0 | % |  |  | 20.0 | % |  |  | 30.0 | % |  |  | 22.8 | %
Cash and cash equivalents |  |  | — | % |  |  | 3.0 | % |  |  | — | % |  |  | 2.9 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Spire Alabama |  | 2023 Target |  |  | 2023 Actual |  |  | 2022 Target |  |  | 2022 Actual |
Return seeking assets |  |  | 75.0 | % |  |  | 76.0 | % |  |  | 70.0 | % |  |  | 68.7 | %
Liability hedging assets |  |  | 25.0 | % |  |  | 15.0 | % |  |  | 30.0 | % |  |  | 25.3 | %
Cash and cash equivalents |  |  | — | % |  |  | 9.0 | % |  |  | — | % |  |  | 6.0 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Spire Missouri |  | Target |  |  | 2023 Actual |  |  | 2022 Actual |
Equity securities |  |  | 60.0 | % |  |  | 58.9 | % |  |  | 58.7 | %
Debt securities |  |  | 40.0 | % |  |  | 38.1 | % |  |  | 40.5 | %
Cash and cash equivalents |  |  | — | % |  |  | 3.0 | % |  |  | 0.8 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Spire Alabama |  | Target |  |  | 2023 Actual |  |  | 2022 Actual |
Equity securities |  |  | 60.5 | % |  |  | 59.9 | % |  |  | 57.7 | %
Debt securities |  |  | 39.5 | % |  |  | 40.1 | % |  |  | 42.3 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Schedule of Expected Benefit Payments [Table Text Block] |
|  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 – 2032 |
Spire |  | $ | 52.4 |  |  | $ | 45.3 |  |  | $ | 41.8 |  |  | $ | 41.8 |  |  | $ | 43.3 |  |  | $ | 202.8 |
Spire Missouri |  |  | 41.0 |  |  |  | 34.1 |  |  |  | 30.4 |  |  |  | 29.4 |  |  |  | 30.5 |  |  |  | 139.1 |
Spire Alabama |  |  | 8.0 |  |  |  | 7.7 |  |  |  | 7.8 |  |  |  | 8.7 |  |  |  | 8.9 |  |  |  | 44.1 |
|  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 – 2032 |
Spire |  | $ | 14.6 |  |  | $ | 14.8 |  |  | $ | 14.9 |  |  | $ | 14.8 |  |  | $ | 14.5 |  |  | $ | 68.6 |
Spire Missouri |  |  | 11.6 |  |  |  | 11.8 |  |  |  | 11.8 |  |  |  | 11.7 |  |  |  | 11.4 |  |  |  | 52.2 |
Spire Alabama |  |  | 2.9 |  |  |  | 2.9 |  |  |  | 2.9 |  |  |  | 2.9 |  |  |  | 2.9 |  |  |  | 15.0 |
Schedule of Health Care Cost Trend Rates [Table Text Block] |
|  | 2023 |  |  | 2022 |
Medical cost trend assumed for next year - Spire Alabama and Spire Missouri |  | 6.50% |  |  | 6.75% |
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 |  | 2030 |  |  | 2028 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | As of September 30, 2023 |  |  | As of September 30, 2022 |
|  | Quoted Prices |  |  | Significant |  |  |  |  |  |  | Quoted Prices |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  |  |  |  |  | in Active |  |  | Observable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  |  |  |  |  | Markets |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | Total |
Cash and cash equivalents |  | $ | 14.8 |  |  | $ | — |  |  | $ | 14.8 |  |  | $ | 11.5 |  |  | $ | — |  |  | $ | 11.5 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 139.0 |  |  |  | 139.0 |  |  |  | — |  |  |  | 122.2 |  |  |  | 122.2 |
Real asset funds |  |  | — |  |  |  | 55.2 |  |  |  | 55.2 |  |  |  | — |  |  |  | 61.0 |  |  |  | 61.0 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 27.8 |  |  |  | — |  |  |  | 27.8 |  |  |  | 42.3 |  |  |  | — |  |  |  | 42.3 |
U.S. government index funds |  |  | 36.2 |  |  |  | — |  |  |  | 36.2 |  |  |  | 36.1 |  |  |  | — |  |  |  | 36.1 |
Global funds (including U.S.) |  |  | — |  |  |  | 61.7 |  |  |  | 61.7 |  |  |  | — |  |  |  | 59.6 |  |  |  | 59.6 |
Total |  | $ | 78.8 |  |  | $ | 255.9 |  |  | $ | 334.7 |  |  | $ | 89.9 |  |  | $ | 242.8 |  |  | $ | 332.7 |
|  | As of September 30, 2023 |  |  | As of September 30, 2022 |
|  | Quoted Prices |  |  | Significant |  |  |  |  |  |  | Quoted Prices |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  |  |  |  |  | in Active |  |  | Observable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  |  |  |  |  | Markets |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | Total |
Cash and cash equivalents |  | $ | 5.1 |  |  | $ | — |  |  | $ | 5.1 |  |  | $ | 3.5 |  |  | $ | — |  |  | $ | 3.5 |
U.S. stock/bond mutual funds |  |  | 188.2 |  |  |  | 76.5 |  |  |  | 264.7 |  |  |  | 177.1 |  |  |  | 69.4 |  |  |  | 246.5 |
International fund |  |  | — |  |  |  | 16.5 |  |  |  | 16.5 |  |  |  | 0.8 |  |  |  | 13.9 |  |  |  | 14.7 |
Total |  | $ | 193.3 |  |  | $ | 93.0 |  |  | $ | 286.3 |  |  | $ | 181.4 |  |  | $ | 83.3 |  |  | $ | 264.7 |
|  | As of September 30, 2023 |  |  | As of September 30, 2022 |
|  | Quoted Prices |  |  | Significant |  |  |  |  |  |  | Quoted Prices |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  |  |  |  |  | in Active |  |  | Observable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  |  |  |  |  | Markets |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | Total |
Cash and cash equivalents |  | $ | 6.8 |  |  | $ | — |  |  | $ | 6.8 |  |  | $ | 5.7 |  |  | $ | — |  |  | $ | 5.7 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 99.4 |  |  |  | 99.4 |  |  |  | — |  |  |  | 85.7 |  |  |  | 85.7 |
Real asset funds |  |  | — |  |  |  | 40.2 |  |  |  | 40.2 |  |  |  | — |  |  |  | 47.2 |  |  |  | 47.2 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 20.9 |  |  |  | — |  |  |  | 20.9 |  |  |  | 29.4 |  |  |  | — |  |  |  | 29.4 |
U.S. government index funds |  |  | 28.7 |  |  |  | — |  |  |  | 28.7 |  |  |  | 24.6 |  |  |  | — |  |  |  | 24.6 |
Global funds (including U.S.) |  |  | — |  |  |  | 46.0 |  |  |  | 46.0 |  |  |  | — |  |  |  | 43.3 |  |  |  | 43.3 |
Total |  | $ | 56.4 |  |  | $ | 185.6 |  |  | $ | 242.0 |  |  | $ | 59.7 |  |  | $ | 176.2 |  |  | $ | 235.9 |
|  | As of September 30, 2023 |  |  | As of September 30, 2022 |
|  | Quoted Prices |  |  | Significant |  |  |  |  |  |  | Quoted Prices |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  |  |  |  |  | in Active |  |  | Observable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  |  |  |  |  | Markets |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | Total |
Cash and cash equivalents |  | $ | 4.3 |  |  | $ | — |  |  | $ | 4.3 |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | 2.7 |
U.S. stock/bond mutual funds |  |  | 184.5 |  |  |  | — |  |  |  | 184.5 |  |  |  | 174.0 |  |  |  | — |  |  |  | 174.0 |
Total |  | $ | 188.8 |  |  | $ | — |  |  | $ | 188.8 |  |  | $ | 176.7 |  |  | $ | — |  |  | $ | 176.7 |
|  | As of September 30, 2023 |  |  | As of September 30, 2022 |
|  | Quoted Prices |  |  | Significant |  |  |  |  |  |  | Quoted Prices |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  |  |  |  |  | in Active |  |  | Observable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  |  |  |  |  | Markets |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | Total |
Cash and cash equivalents |  | $ | 4.6 |  |  | $ | — |  |  | $ | 4.6 |  |  | $ | 3.5 |  |  | $ | — |  |  | $ | 3.5 |
Equity funds - global (including U.S.) |  |  | — |  |  |  | 22.9 |  |  |  | 22.9 |  |  |  | — |  |  |  | 21.6 |  |  |  | 21.6 |
Real asset funds |  |  | — |  |  |  | 8.7 |  |  |  | 8.7 |  |  |  | — |  |  |  | 8.1 |  |  |  | 8.1 |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. bond funds |  |  | 4.0 |  |  |  | — |  |  |  | 4.0 |  |  |  | 7.7 |  |  |  | — |  |  |  | 7.7 |
U.S. government index funds |  |  | 4.3 |  |  |  | — |  |  |  | 4.3 |  |  |  | 6.8 |  |  |  | — |  |  |  | 6.8 |
Global funds (including U.S.) |  |  | — |  |  |  | 9.1 |  |  |  | 9.1 |  |  |  | — |  |  |  | 9.6 |  |  |  | 9.6 |
Total |  | $ | 12.9 |  |  | $ | 40.7 |  |  | $ | 53.6 |  |  | $ | 18.0 |  |  | $ | 39.3 |  |  | $ | 57.3 |
|  | As of September 30, 2023 |  |  | As of September 30, 2022 |
|  | Quoted Prices |  |  | Significant |  |  |  |  |  |  | Quoted Prices |  |  | Significant |  |  |  |  |
|  | in Active |  |  | Observable |  |  |  |  |  |  | in Active |  |  | Observable |  |  |  |  |
|  | Markets |  |  | Inputs |  |  |  |  |  |  | Markets |  |  | Inputs |  |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | Total |
U.S. stock/bond mutual funds |  | $ | — |  |  | $ | 76.5 |  |  | $ | 76.5 |  |  | $ | — |  |  | $ | 69.4 |  |  | $ | 69.4 |
International fund |  |  | — |  |  |  | 15.5 |  |  |  | 15.5 |  |  |  | — |  |  |  | 13.9 |  |  |  | 13.9 |
Total |  | $ | — |  |  | $ | 92.0 |  |  | $ | 92.0 |  |  | $ | — |  |  | $ | 83.3 |  |  | $ | 83.3 |

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