XML 46 R34.htm IDEA: XBRL DOCUMENT v3.24.2
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