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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Benefit Cost

The components of net periodic expense were as follows:

 

Defined Benefit Pension Plan

 

Supplemental Non-qualified Defined Benefit Plans

 

Non-pension Defined Benefit Postretirement Healthcare Plan

 

Three Months Ended September 30,

2025

 

2024

 

2025

 

2024

 

2025

 

2024

 

 

(in millions)

 

Service cost

$

0.4

 

$

0.6

 

$

1.2

 

$

1.3

 

$

0.4

 

$

0.4

 

Interest cost

 

4.0

 

 

4.1

 

 

0.3

 

 

0.4

 

 

0.6

 

 

0.6

 

Expected return on plan assets

 

(4.2

)

 

(4.5

)

 

—

 

 

—

 

 

(0.1

)

 

(0.1

)

Net amortization of prior service costs

 

—

 

 

—

 

 

—

 

 

—

 

 

0.1

 

 

0.1

 

Recognized net actuarial loss

 

0.5

 

 

0.5

 

 

—

 

 

—

 

 

—

 

 

—

 

Net periodic expense

$

0.7

 

$

0.7

 

$

1.5

 

$

1.7

 

$

1.0

 

$

1.0

 

 

 

Defined Benefit Pension Plan

 

Supplemental Non-qualified Defined Benefit Plans

 

Non-pension Defined Benefit Postretirement Healthcare Plan

 

Nine Months Ended September 30,

2025

 

2024

 

2025

 

2024

 

2025

 

2024

 

 

(in millions)

 

Service cost

$

1.3

 

$

1.7

 

$

2.8

 

$

2.9

 

$

1.1

 

$

1.2

 

Interest cost

 

12.0

 

 

12.3

 

 

1.1

 

 

1.1

 

 

1.8

 

 

1.8

 

Expected return on plan assets

 

(12.7

)

 

(13.4

)

 

—

 

 

—

 

 

(0.2

)

 

(0.2

)

Net amortization of prior service costs

 

(0.1

)

 

(0.1

)

 

—

 

 

—

 

 

0.2

 

 

0.1

 

Recognized net actuarial loss

 

1.6

 

 

1.5

 

 

—

 

 

—

 

 

—

 

 

—

 

Net periodic expense

$

2.1

 

$

2.0

 

$

3.9

 

$

4.0

 

$

2.9

 

$

2.9

 

 
Schedule of Employer Contribution to Employee Benefit Plans

Contributions made in the first nine months of 2025 and additional contributions anticipated for the remainder of 2025 are as follows:

 

 

Contributions
Made

 

Additional Contributions

 

 

Nine Months Ended September 30, 2025

 

Anticipated for 2025

 

 

(in millions)

 

Defined Benefit Pension Plan

$

1.8

 

$

—

 

Non-pension Defined Benefit Postretirement Healthcare Plan

 

3.5

 

 

1.2

 

Supplemental Non-qualified Defined Benefit and Defined Contribution Plans

 

2.1

 

 

0.7