v3.26.1
Benefit Plans and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2026
Benefit Plans and Other Postretirement Benefits  
Schedule of components of net pension expense

Three Months Ended

Six Months Ended

June 30, 

June 30, 

  ​ ​ ​

2026

 

2025

  

2026

 

2025

Service cost

 

$

1.4

$

0.7

$

2.8

$

1.5

Interest cost

 

7.6

 

5.9

 

15.2

 

11.7

Expected return on plan assets

 

(8.4)

 

(6.6)

 

(16.9)

 

(13.2)

Amortization of prior service cost

 

0.3

 

0.3

 

0.6

 

0.6

Amortization of net actuarial losses

 

0.7

 

0.7

 

1.4

 

1.5

Net pension expense

 

$

1.6

$

1.0

$

3.1

$

2.1