Three Months Ended
June 30,

Nine Months Ended
 June 30,

2025

2024

2025

2024

Spire

Service cost – benefits earned during the period

$

4.4

$

3.9

$

13.2

$

11.8

Interest cost on projected benefit obligation

5.8

6.6

17.6

20.0

Expected return on plan assets

(6.4

)

(6.3

)

(19.3

)

(18.7

)

Amortization of prior service credit

(1.2

)

(1.1

)

(3.5

)

(3.4

)

Amortization of actuarial loss

1.6

1.6

4.8

4.8

Loss on lump-sum settlements

—

1.0

—

1.0

Subtotal

4.2

5.7

12.8

15.5

Regulatory adjustment

9.2

8.8

27.3

26.3

Net pension cost

$

13.4

$

14.5

$

40.1

$

41.8

Spire Missouri

Service cost – benefits earned during the period

$

2.9

$

2.6

$

8.6

$

7.8

Interest cost on projected benefit obligation

3.9

4.7

11.9

14.2

Expected return on plan assets

(4.4

)

(4.3

)

(13.2

)

(12.8

)

Amortization of prior service credit

(0.5

)

(0.5

)

(1.5

)

(1.5

)

Amortization of actuarial loss

1.0

1.5

3.0

4.4

Loss on lump-sum settlements

—

1.0

—

1.0

Subtotal

2.9

5.0

8.8

13.1

Regulatory adjustment

7.4

6.2

22.2

18.8

Net pension cost

$

10.3

$

11.2

$

31.0

$

31.9

Spire Alabama

Service cost – benefits earned during the period

$

1.4

$

1.2

$

4.1

$

3.5

Interest cost on projected benefit obligation

1.3

1.3

3.8

3.8

Expected return on plan assets

(1.3

)

(1.2

)

(3.9

)

(3.6

)

Amortization of prior service credit

(0.7

)

(0.6

)

(1.9

)

(1.8

)

Amortization of actuarial loss

0.6

0.2

1.8

0.7

Subtotal

1.3

0.9

3.9

2.6

Regulatory adjustment

1.5

2.3

4.4

6.8

Net pension cost

$

2.8

$

3.2

$

8.3

$

9.4

Three Months Ended
June 30,

Nine Months Ended
 June 30,

2025

2024

2025

2024

Spire

Service cost – benefits earned during the period

$

1.1

$

1.2

$

3.2

$

3.3

Interest cost on accumulated postretirement benefit obligation

1.7

2.1

5.3

6.6

Expected return on plan assets

(4.1

)

(3.7

)

(12.5

)

(11.9

)

Amortization of prior service cost

0.1

—

0.1

0.2

Amortization of actuarial gain

(1.5

)

(1.2

)

(4.5

)

(3.3

)

Subtotal

(2.7

)

(1.6

)

(8.4

)

(5.1

)

Regulatory adjustment

1.1

0.1

3.4

0.6

Net postretirement benefit income

$

(1.6

)

$

(1.5

)

$

(5.0

)

$

(4.5

)

Spire Missouri

Service cost – benefits earned during the period

$

0.9

$

0.9

$

2.6

$

2.7

Interest cost on accumulated postretirement benefit obligation

1.2

1.6

3.8

4.9

Expected return on plan assets

(2.7

)

(2.5

)

(8.2

)

(7.9

)

Amortization of prior service cost

0.1

0.1

0.2

0.4

Amortization of actuarial gain

(1.3

)

(1.0

)

(3.9

)

(2.8

)

Subtotal

(1.8

)

(0.9

)

(5.5

)

(2.7

)

Regulatory adjustment

1.5

0.6

4.7

1.9

Net postretirement benefit income

$

(0.3

)

$

(0.3

)

$

(0.8

)

$

(0.8

)

Spire Alabama

Service cost – benefits earned during the period

$

0.2

$

0.2

$

0.6

$

0.5

Interest cost on accumulated postretirement benefit obligation

0.4

0.5

1.4

1.6

Expected return on plan assets

(1.3

)

(1.2

)

(4.0

)

(3.8

)

Amortization of prior service credit

—

(0.1

)

(0.1

)

(0.2

)

Amortization of actuarial gain

—

—

(0.1

)

(0.1

)

Subtotal

(0.7

)

(0.6

)

(2.2

)

(2.0

)

Regulatory adjustment

(0.5

)

(0.5

)

(1.4

)

(1.4

)

Net postretirement benefit income

$

(1.2

)

$

(1.1

)

$

(3.6

)

$

(3.4

)