Net

Defined Benefit

Net Unrealized

Unrealized

Pension and

Gain (Loss) on

Gain (Loss)

Other

Available-for-

on Cash Flow

Postretirement

Sale Debt

Hedges

Benefit Plans

Securities

Total

Spire

Balance at September 30, 2023

$

50.5

$

(2.5

)

$

(0.4

)

$

47.6

Other comprehensive (loss) income

(36.3

)

0.5

0.3

(35.5

)

Balance at September 30, 2024

14.2

(2.0

)

(0.1

)

12.1

Other comprehensive income

5.9

1.3

0.1

7.3

Balance at September 30, 2025

$

20.1

$

(0.7

)

$

—

$

19.4

Spire Missouri

Balance at September 30, 2023

$

—

$

(2.5

)

$

—

$

(2.5

)

Other comprehensive income

—

0.5

—

0.5

Balance at September 30, 2024

—

(2.0

)

—

(2.0

)

Other comprehensive income

—

1.3

—

1.3

Balance at September 30, 2025

$

—

$

(0.7

)

$

—

$

(0.7

)