Three Months Ended March 31,

2025

2024

2025

2024

(dollars in millions)

Pension Benefits

Postretirement and Other Benefits

Service cost

$

—

$

—

$

0.1

$

0.1

Other components of pension and postretirement benefit plans expense:

Interest cost on projected benefit obligation

3.9

5.1

1.3

1.2

Expected return on plan assets

(4.0

)

(5.7

)

—

—

Amortization of:

Prior service benefit

—

—

(0.2

)

(0.2

)

Actuarial gain

(0.1

)

—

(1.1

)

(0.9

)

Pension settlement gain

(1.0

)

—

—

—

Postretirement curtailment gain

—

—

(0.2

)

—

Pension / postretirement (benefit) cost

$

(1.2

)

$

(0.6

)

$

(0.1

)

$

0.2