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Pension and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost (Credit)

The net periodic benefit cost (credit) for pension and postretirement benefits includes the following components:

 

 

 

Pension

 

 

Postretirement Benefits

 

 

 

Three Months Ended March 31,

 

 

 

2023

 

 

2022

 

 

2023

 

 

2022

 

 

 

(Dollars in Millions)

 

Service cost

 

$

7.7

 

 

$

11.5

 

 

$

—

 

 

$

—

 

Interest cost

 

 

12.7

 

 

 

10.2

 

 

 

0.1

 

 

 

0.1

 

Expected return on assets

 

 

(17.8

)

 

 

(19.4

)

 

 

—

 

 

 

—

 

Amortization of:

 

 

 

 

 

 

 

 

 

 

 

 

Prior service cost (credit)

 

 

1.4

 

 

 

1.2

 

 

 

(0.1

)

 

 

(0.2

)

Actuarial loss (gain)

 

 

0.1

 

 

 

0.9

 

 

 

(0.1

)

 

 

(0.1

)

Net periodic benefit cost (credit)

 

$

4.1

 

 

$

4.4

 

 

$

(0.1

)

 

$

(0.2

)