v3.25.2
Employee Benefit Plans and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs

The components of net periodic benefit cost for our pension plans were as follows (dollars in millions):

 

 

 

Pension Plans

 

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2025

 

 

2024

 

 

2025

 

 

2024

 

Service cost

 

$

2.6

 

 

$

3.1

 

 

$

5.2

 

 

$

6.3

 

Interest cost

 

 

14.3

 

 

 

13.9

 

 

 

28.6

 

 

 

27.7

 

Expected return on plan assets

 

 

(15.6

)

 

 

(16.5

)

 

 

(31.2

)

 

 

(32.9

)

Net amortization of unrecognized amounts

 

 

 

 

 

 

 

 

 

 

 

 

Prior service cost

 

 

1.4

 

 

 

1.4

 

 

 

2.8

 

 

 

2.7

 

Actuarial loss

 

 

 

 

 

0.2

 

 

 

 

 

 

0.4

 

Net periodic benefit cost

 

$

2.7

 

 

$

2.1

 

 

$

5.4

 

 

$

4.2