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Note 8 - Pension Plans and Other Postretirement Benefits - Net Pension Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Plan [Member]        
Service cost – benefits earned during the period $ 4.8 $ 5.5 $ 15.6 $ 16.4
Interest cost on projected benefit obligation 5.4 5.5 15.8 15.3
Expected return on plan assets (7.7) (8.5) (24.1) (23.6)
Amortization of prior service credit (1.1) (0.9) (3.4) (2.4)
Amortization of actuarial loss 2.5 3.8 9.8 11.6
Loss on lump-sum settlements 17.8 11.2 29.5 15.0
Subtotal 21.7 16.6 43.2 32.3
Regulatory adjustment (6.9) 1.3 2.5 19.9
Net pension cost 14.8 17.9 45.7 52.2
Pension Plan [Member] | Spire Missouri [Member]        
Service cost – benefits earned during the period 3.5 3.9 11.2 11.7
Interest cost on projected benefit obligation 3.8 3.5 10.9 10.5
Expected return on plan assets (5.7) (5.7) (17.6) (16.9)
Amortization of prior service credit (0.5) (0.2) (1.5) (0.5)
Amortization of actuarial loss 2.0 2.8 7.6 8.5
Loss on lump-sum settlements 17.3 9.1 24.1 9.1
Subtotal 20.4 13.4 34.7 22.4
Regulatory adjustment (8.3) (1.4) 1.3 13.7
Net pension cost 12.1 12.0 36.0 36.1
Pension Plan [Member] | Spire Alabama Inc [Member]        
Service cost – benefits earned during the period 1.1 1.3 3.8 4.2
Interest cost on projected benefit obligation 1.1 1.1 3.4 3.5
Expected return on plan assets (1.2) (1.4) (4.0) (4.5)
Amortization of prior service credit (0.6) (0.6) (1.8) (1.8)
Amortization of actuarial loss 0.5 1.0 2.2 3.1
Loss on lump-sum settlements 0.5 2.1 5.4 5.9
Subtotal 1.4 3.5 9.0 10.4
Regulatory adjustment 1.1 2.5 0.5 5.6
Net pension cost 2.5 6.0 9.5 16.0
Other Postretirement Benefits Plan [Member]        
Service cost – benefits earned during the period 1.9 1.7 5.8 5.4
Interest cost on projected benefit obligation 1.6 1.4 4.6 4.4
Expected return on plan assets (4.3) (4.0) (12.8) (12.1)
Amortization of prior service credit 0.3 0.3 0.8 0.8
Amortization of actuarial loss (0.5) (0.4) (1.7) (1.2)
Subtotal (1.0) (1.0) (3.3) (2.7)
Regulatory adjustment (0.1) 3.5 3.2 10.1
Net pension cost (1.1) 2.5 (0.1) 7.4
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]        
Service cost – benefits earned during the period 1.6 1.5 4.8 4.6
Interest cost on projected benefit obligation 1.2 1.1 3.4 3.3
Expected return on plan assets (2.9) (2.6) (8.6) (8.1)
Amortization of prior service credit 0.2 0.2 0.6 0.6
Amortization of actuarial loss (0.5) (0.4) (1.5) (1.1)
Subtotal (0.4) (0.2) (1.3) (0.7)
Regulatory adjustment 0.4 3.8 4.5 11.3
Net pension cost 0.0 3.6 3.2 10.6
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]        
Service cost – benefits earned during the period 0.3 0.2 0.9 0.7
Interest cost on projected benefit obligation 0.4 0.3 1.1 1.0
Expected return on plan assets (1.3) (1.3) (3.9) (3.8)
Amortization of prior service credit 0.1 0.1 0.2 0.2
Subtotal (0.5) (0.7) (1.7) (1.9)
Regulatory adjustment (0.5) (0.4) (1.4) (1.3)
Net pension cost $ (1.0) $ (1.1) $ (3.1) $ (3.2)