Three Months Ended
March 31,

Six Months Ended
March 31,

2025

2024

2025

2024

Spire

Service cost – benefits earned during the period

$

1.0

$

1.0

$

2.1

$

2.1

Interest cost on accumulated postretirement benefit obligation

1.8

2.4

3.6

4.5

Expected return on plan assets

(4.2

)

(4.2

)

(8.4

)

(8.2

)

Amortization of prior service cost

—

0.1

—

0.2

Amortization of actuarial gain

(1.5

)

(1.1

)

(3.0

)

(2.1

)

Subtotal

(2.9

)

(1.8

)

(5.7

)

(3.5

)

Regulatory adjustment

1.2

0.3

2.3

0.5

Net postretirement benefit income

$

(1.7

)

$

(1.5

)

$

(3.4

)

$

(3.0

)

Spire Missouri

Service cost – benefits earned during the period

$

0.8

$

0.9

$

1.7

$

1.8

Interest cost on accumulated postretirement benefit obligation

1.3

1.7

2.6

3.3

Expected return on plan assets

(2.7

)

(2.7

)

(5.5

)

(5.4

)

Amortization of prior service cost

—

0.1

0.1

0.3

Amortization of actuarial gain

(1.3

)

(0.9

)

(2.6

)

(1.8

)

Subtotal

(1.9

)

(0.9

)

(3.7

)

(1.8

)

Regulatory adjustment

1.6

0.7

3.2

1.3

Net postretirement benefit income

$

(0.3

)

$

(0.2

)

$

(0.5

)

$

(0.5

)

Spire Alabama

Service cost – benefits earned during the period

$

0.2

$

0.1

$

0.4

$

0.3

Interest cost on accumulated postretirement benefit obligation

0.5

0.6

1.0

1.1

Expected return on plan assets

(1.4

)

(1.3

)

(2.7

)

(2.6

)

Amortization of prior service credit

—

—

(0.1

)

(0.1

)

Amortization of actuarial gain

(0.1

)

(0.1

)

(0.1

)

(0.1

)

Subtotal

(0.8

)

(0.7

)

(1.5

)

(1.4

)

Regulatory adjustment

(0.4

)

(0.5

)

(0.9

)

(0.9

)

Net postretirement benefit income

$

(1.2

)

$

(1.2

)

$

(2.4

)

$

(2.3

)