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Benefit Plans and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2022
Benefit Plans and Other Postretirement Benefits  
Schedule of components of net pension expense

Three Months Ended September 30, 

Nine Months Ended September 30, 

    

2022

 

2021

  

2022

 

2021

Service cost

 

$

1.5

$

1.9

$

4.5

$

5.6

Interest cost

 

3.4

 

2.8

 

10.5

 

8.4

Expected return on plan assets

 

(7.5)

 

(7.8)

 

(22.5)

 

(23.4)

Amortization of prior service cost

 

0.4

 

0.5

 

1.1

 

1.5

Amortization of net actuarial losses

 

4.0

 

6.2

 

12.2

 

18.7

Net pension expense

 

$

1.8

$

3.6

$

5.8

$

10.8