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Retirement Plans
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Retirement Plans

(10) Retirement Plans

 

The components of the net periodic benefit cost (credit) for our plans were as follows:

 

 

 

Defined Benefit Pension Plan

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Service cost

 

$

4.2

 

 

$

3.9

 

 

$

12.3

 

 

$

11.6

 

Interest cost

 

 

4.8

 

 

 

5.3

 

 

 

14.4

 

 

 

15.8

 

Expected return on assets

 

 

(4.8

)

 

 

(4.8

)

 

 

(14.1

)

 

 

(14.2

)

Curtailments

 

 

—

 

 

 

—

 

 

 

(1.3

)

 

 

—

 

Net gain

 

 

(0.3

)

 

 

(0.8

)

 

 

(1.1

)

 

 

(2.5

)

Prior service cost

 

 

0.2

 

 

 

0.2

 

 

 

0.5

 

 

 

0.5

 

Total benefit cost

 

$

4.1

 

 

$

3.8

 

 

$

10.7

 

 

$

11.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Retiree Health Care Plan

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Interest cost

 

$

0.1

 

 

$

0.1

 

 

$

0.3

 

 

$

0.4

 

Prior service credit

 

 

(0.2

)

 

 

(0.2

)

 

 

(0.6

)

 

 

(0.6

)

Total benefit credit

 

$

(0.1

)

 

$

(0.1

)

 

$

(0.3

)

 

$

(0.2

)

 

During the three and nine months ended September 30, 2024, contributions made to our pension plans were $4.2 and $13.7, respectively, and contributions made to our retiree health care plan were $0.2 and $0.8, respectively. During 2024, we expect to make total contributions of approximately $19.0 to our pension plans and to fund our retiree health care payments as incurred.