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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Credit)

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

 

 

 

Three Months Ended March 31,

 

 

 

Defined Benefit Pension Plans

 

 

Retiree Health Care Plan

 

 

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Service cost

 

$

4.1

 

 

$

3.8

 

 

$

—

 

 

$

—

 

Interest cost

 

 

4.8

 

 

 

5.2

 

 

 

0.1

 

 

 

0.1

 

Expected return on assets

 

 

(4.7

)

 

 

(4.6

)

 

 

—

 

 

 

—

 

Net gain

 

 

(0.4

)

 

 

(0.9

)

 

 

—

 

 

 

—

 

Prior service cost (credit)

 

 

0.2

 

 

 

0.2

 

 

 

(0.2

)

 

 

(0.2

)

Total benefit cost (credit)

 

$

4.0

 

 

$

3.7

 

 

$

(0.1

)

 

$

(0.1

)

 

C