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Pension and Savings Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Pension and Savings Plans [Abstract]  
Components of net periodic pension cost
Net periodic postretirement benefit credit included the following components:
 Year Ended December 31,
 202420232022
 (Dollars in millions)
Service cost for benefits earned$0.5 $0.5 $0.8 
Interest cost on accumulated postretirement benefit obligation9.1 10.2 7.0 
Expected return on plan assets(0.4)(0.5)(0.8)
Amortization of prior service credit(53.0)(53.8)(53.8)
Net actuarial gain(17.0)(2.6)(51.2)
Net periodic postretirement benefit credit$(60.8)$(46.2)$(98.0)
Net periodic pension cost included the following components:
 Year Ended December 31,
 202420232022
 (Dollars in millions)
Service cost for benefits earned$0.1 $0.1 $0.1 
Interest cost on projected benefit obligation6.5 20.1 21.4 
Expected return on plan assets(4.9)(17.6)(23.8)
Settlement— (2.2)— 
Net actuarial loss1.9 — 20.6 
Net periodic pension cost$3.6 $0.4 $18.3 
Summary of change in benefit obligation, change in plan assets and funded status
The following table sets forth the plans’ funded status reconciled with the amounts shown in the consolidated balance sheets:
 December 31,
 20242023
 (Dollars in millions)
Change in benefit obligation:
Accumulated postretirement benefit obligation at beginning of period$178.0 $189.9 
Service cost0.5 0.5 
Interest cost9.1 10.2 
Plan amendments(6.5)— 
Benefits paid and administrative fees (net of Medicare Part D reimbursements)(18.8)(20.9)
Actuarial gain(16.9)(1.7)
Accumulated postretirement benefit obligation at end of period145.4 178.0 
Change in plan assets:
Fair value of plan assets at beginning of period14.3 17.4 
Actual return on plan assets0.5 1.5 
Employer contributions15.3 16.3 
Benefits paid and administrative fees (net of Medicare Part D reimbursements)(18.8)(20.9)
Fair value of plan assets at end of period11.3 14.3 
Funded status at end of period(134.1)(163.7)
Less: Current portion (included in “Accounts payable and accrued expenses”)13.7 15.3 
Noncurrent obligation (included in “Accrued postretirement benefit costs”)$120.4 $148.4 
The following summarizes the change in benefit obligation, change in plan assets and funded status of the Pension Plans:
 December 31,
 20242023
 (Dollars in millions)
Change in benefit obligation:
Projected benefit obligation at beginning of period$125.2 $580.9 
Service cost0.1 0.1 
Interest cost6.5 20.1 
Benefits paid(10.7)(36.1)
Actuarial (gain) loss(3.5)3.4 
Settlement— (443.2)
Projected benefit obligation at end of period117.6 125.2 
Change in plan assets:
Fair value of plan assets at beginning of period116.0 583.3 
Actual return on plan assets(0.5)23.1 
Employer contributions— (11.1)
Benefits paid(10.7)(36.1)
Settlement— (443.2)
Fair value of plan assets at end of period104.8 116.0 
Funded status at end of period$(12.8)$(9.2)
Amounts recognized in the consolidated balance sheets:
Noncurrent obligation (included in “Other noncurrent liabilities”)$12.8 $9.2 
Defined benefit plan, assumptions
The weighted-average assumptions used to determine the benefit obligations for the plans as of the end of each year were as follows:
December 31,
 20242023
Discount rate5.70 %5.44 %
Measurement dateDecember 31, 2024December 31, 2023
The weighted-average assumptions used to determine net periodic postretirement benefit credit for the plans during each period were as follows:
Year Ended December 31,
 202420232022
Discount rate5.44 %5.70 %2.84 %
Expected long-term return on plan assets (pretax)5.75 %5.75 %5.75 %
Measurement dateDecember 31, 2023December 31, 2022December 31, 2021
The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
December 31,
 20242023
Discount rate5.70 %5.40 %
Measurement dateDecember 31, 2024December 31, 2023
The weighted-average assumptions used to determine net periodic pension cost (credit) during each period were as follows:
Year Ended December 31,
202420232022
Discount rate5.40 %5.44 %2.95 %
Expected long-term return on plan assets4.40 %4.85 %3.20 %
Measurement dateDecember 31, 2023December 31, 2022December 31, 2021
Fair value of assets in the Master Trust by category and by fair value valuation hierarchy
The following tables present the fair value of assets in the Master Trust by asset category and by fair value hierarchy:
 December 31, 2024
 Level 1Level 2Level 3Total
 (Dollars in millions)
Corporate bonds$— $65.3 $— $65.3 
U.S. government securities13.7 3.4 — 17.1 
International government securities— 1.5 — 1.5 
Asset-backed securities— 0.4 — 0.4 
Cash funds4.3 — — 4.3 
Total assets at fair value$18.0 $70.6 $— 88.6 
Assets measured at net asset value practical expedient (1)
Private mutual funds16.2 
Total plan assets$104.8 
 December 31, 2023
 Level 1Level 2Level 3Total
 (Dollars in millions)
Corporate bonds$— $66.7 $— $66.7 
U.S. government securities19.3 4.1 — 23.4 
International government securities— 1.5 — 1.5 
Asset-backed securities— 0.5 — 0.5 
Cash funds3.8 — — 3.8 
Total assets at fair value$23.1 $72.8 $— 95.9 
Assets measured at net asset value practical expedient (1)
Private mutual funds20.1 
Total plan assets$116.0 
(1)     In accordance with Accounting Standards Update 2015-07, investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the tables are intended to permit reconciliation of the fair value hierarchy to the total value of assets of the plans.
Summary of changes in the fair value of the Master Trust's Level 3 investments
The table below sets forth a summary of changes in the fair value of the Master Trust’s Level 3 investments:
 Year Ended December 31,
202420232022
 (Dollars in millions)
Balance, beginning of period$— $430.4 $0.3 
Realized (losses) gains— (10.4)0.1 
Unrealized losses relating to investments still held at the reporting date— — (68.8)
Purchases, sales and settlements, net— (420.0)498.8 
Balance, end of period$— $— $430.4 
Summary of estimated future benefit payments
The following benefit payments (net of retiree contributions and Medicare Part D reimbursements), which reflect expected future service, as appropriate, are expected to be paid by the Company or satisfied from Non-Represented Trust assets:
 Postretirement
Benefits
 (Dollars in millions)
2025$18.7 
202617.6 
202716.6 
202815.6 
202914.5 
Years 2030-203458.0 
The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid in connection with the Company’s benefit obligation:
 Pension Benefits
 (Dollars in millions)
2025
$10.9 
2026
10.7 
2027
10.6 
2028
10.4 
2029
10.2 
Years 2030-2034
47.1