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Employee Benefit Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2022
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,

 

 

 

2022

 

 

2021

 

 

2022

 

 

2021

 

Service cost

 

$

4.9

 

 

$

5.4

 

 

$

9.9

 

 

$

10.7

 

Interest cost

 

 

8.7

 

 

 

7.4

 

 

 

17.4

 

 

 

14.9

 

Expected return on plan assets

 

 

(13.9

)

 

 

(15.8

)

 

 

(27.9

)

 

 

(31.6

)

Net amortization of unrecognized amounts

 

 

 

 

 

 

 

 

 

 

 

 

Prior service cost

 

 

0.9

 

 

 

1.0

 

 

 

1.8

 

 

 

1.9

 

Actuarial loss

 

 

0.8

 

 

 

2.5

 

 

 

1.7

 

 

 

5.0

 

Net periodic benefit cost

 

$

1.4

 

 

$

0.5

 

 

$

2.9

 

 

$

0.9