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Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Change In Benefit Obligation
The following table summarizes the change in Union Plan assets and changes in benefit obligations:
(Dollars in millions)20242023
Change in plan assets:
Fair value of plan assets as of January 1$26.7 $26.3 
Actual return on plan assets0.4 1.9 
Settlements— (0.3)
Employer contributions— 0.3 
Benefit payments(1.7)(1.5)
Fair value of plan assets as of December 31$25.4 $26.7 
Change in plan benefit obligations:
Fair value of plan benefit obligations as of January 1$21.4 $21.3 
Interest cost1.0 1.1 
Actuarial (gain) loss(1.7)0.8 
Settlements— (0.3)
Benefit payments(1.7)(1.5)
Fair value of plan benefit obligations as of December 31$19.0 $21.4 
Amount overfunded$6.4 $5.3 
Schedule of Change in Plan Assets
The following table summarizes the change in Union Plan assets and changes in benefit obligations:
(Dollars in millions)20242023
Change in plan assets:
Fair value of plan assets as of January 1$26.7 $26.3 
Actual return on plan assets0.4 1.9 
Settlements— (0.3)
Employer contributions— 0.3 
Benefit payments(1.7)(1.5)
Fair value of plan assets as of December 31$25.4 $26.7 
Change in plan benefit obligations:
Fair value of plan benefit obligations as of January 1$21.4 $21.3 
Interest cost1.0 1.1 
Actuarial (gain) loss(1.7)0.8 
Settlements— (0.3)
Benefit payments(1.7)(1.5)
Fair value of plan benefit obligations as of December 31$19.0 $21.4 
Amount overfunded$6.4 $5.3 
Schedule Of Amounts Recognized In Consolidated Balance Sheet
The Union Plan balances reflected in the consolidated statements of financial position, as of December 31, 2024 and 2023, consisted of the following:
(Dollars in millions)20242023
Assets & Liabilities:
Non-current assets$6.4 $5.3 
Net assets$6.4 $5.3 
Accumulated Other Comprehensive Loss:
Net actuarial loss$(10.4)$(11.6)
Accumulated other comprehensive loss$(10.4)$(11.6)
Schedule Of Net Periodic Benefit Cost Not Yet Recognized
The Union Plan balances reflected in the consolidated statements of financial position, as of December 31, 2024 and 2023, consisted of the following:
(Dollars in millions)20242023
Assets & Liabilities:
Non-current assets$6.4 $5.3 
Net assets$6.4 $5.3 
Accumulated Other Comprehensive Loss:
Net actuarial loss$(10.4)$(11.6)
Accumulated other comprehensive loss$(10.4)$(11.6)
Schedule of Projected Benefit Obligation and Fair Value of Plan Assets
The PBO, ABO, and fair value of plan assets for the Union Plan, which has plan assets in excess of its PBO or ABO as of December 31, 2024 and 2023, were as follows:
(Dollars in millions)20242023
Projected benefit obligation$19.0 $21.5 
Accumulated benefit obligation$19.0 $21.5 
Fair value of plan assets$25.4 $26.7 
Schedule of Accumulated Benefit Obligation and Fair Value of Plan Assets
The PBO, ABO, and fair value of plan assets for the Union Plan, which has plan assets in excess of its PBO or ABO as of December 31, 2024 and 2023, were as follows:
(Dollars in millions)20242023
Projected benefit obligation$19.0 $21.5 
Accumulated benefit obligation$19.0 $21.5 
Fair value of plan assets$25.4 $26.7 
Schedule of Components of Net Periodic Benefit Cost
The components of the Union Plan’s net periodic benefit cost (credit) in 2024, 2023 and 2022, were as follows:
(Dollars in millions)202420232022
Interest cost$1.0 $1.1 $0.7 
Expected return of plan assets(1.3)(1.4)(1.3)
Amortization of net loss0.5 0.5 0.4 
Settlement— 0.1 — 
Net periodic benefit cost (credit)$0.2 $0.3 $(0.2)
Schedule of Weighted-Average Assumptions Used
The key plan assumptions for the Union Plan utilized in our annual plan measurement as of December 31, 2024 and 2023, were as follows:
20242023
Weighted average assumptions used in benefit obligations:
Discount rate5.50 %4.75 %
Weighted average assumptions used in net periodic benefit costs:
Discount rate4.75 %5.25 %
Expected long-term rate of return on assets5.22 %5.59 %
Schedule of Allocation Of Plan Assets
The following table presents the fair value of the pension plan net assets by asset category and level, within the fair value hierarchy, as of December 31, 2024 and 2023:
Fair Value of Plan Assets as of December 31, 2024
(Dollars in millions)Level 1Level 2Level 3Total
Fixed income bonds$— $21.6 $— $21.6 
Mutual funds2.8 — — 2.8 
Pooled separate accounts— — — — 
Guaranteed deposit account— — 1.0 1.0 
Total plan assets at fair value$2.8 $21.6 $1.0 $25.4 
Fair Value of Plan Assets as of December 31, 2023
(Dollars in millions)Level 1Level 2Level 3Total
Fixed income bonds$0.2 $22.3 $— $22.5 
Mutual funds3.0 — — 3.0 
Pooled separate accounts— 0.1 — 0.1 
Guaranteed deposit account— — 1.1 1.1 
Total plan assets at fair value$3.2 $22.4 $1.1 $26.7 
Schedule of Future Benefit Payments The following table sets forth the expected benefit payments to be paid for the Union Plan:
(Dollars in millions)Pension Benefits
2025$1.7 
2026$1.7 
2027$1.7 
2028$1.6 
2029$1.6 
2030-2034$7.3 
Debt Securities, Trading, and Equity Securities, FV-NI The following table summarizes, by major security type, our marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy:
Fair Value of Deferred Compensation Plan as of December 31, 2024
(Dollars in millions)Adjusted CostUnrealized GainsUnrealized LossesFair Value
Level 1 Securities:
Mutual funds$4.6 $0.5 $— $5.1 
Level 2 Securities:
Fixed income funds$0.2 $— $— $0.2 
Total$4.8 $0.5 $— $5.3 
Fair Value of Deferred Compensation Plan as of December 31, 2023
(Dollars in millions)Adjusted CostUnrealized GainsUnrealized LossesFair Value
Level 1 Securities:
Mutual funds$5.1 $0.2 $(0.1)$5.2 
Level 2 Securities:
Fixed income funds$0.4 $— $— $0.4 
Total$5.5 $0.2 $(0.1)$5.6