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Benefit Plans and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2024
Benefit Plans and Other Postretirement Benefits  
Schedule of components of net pension expense

Three Months Ended June 30, 

Six Months Ended June 30, 

    

2024

 

2023

  

2024

 

2023

Service cost

 

$

0.8

$

1.8

$

1.8

$

3.7

Interest cost

 

6.0

 

6.5

 

12.0

 

13.0

Expected return on plan assets

 

(7.2)

 

(7.3)

 

(14.3)

 

(14.6)

Amortization of prior service cost

 

0.3

 

0.5

 

0.6

 

0.9

Amortization of net actuarial losses

 

0.7

 

0.5

 

1.7

 

1.1

Net pension expense

 

$

0.6

$

2.0

$

1.8

$

4.1