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Pension and Savings Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Pension and Savings Plans [Abstract] |
Net periodic pension cost | Net periodic postretirement benefit (benefit) cost included the following components:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
| (Dollars in millions)
Service cost for benefits earned | $ | 1.0 |  |  | $ | 3.8 |  |  | $ | 4.8 |
Interest cost on accumulated postretirement benefit obligation | 10.5 |  |  | 20.2 |  |  | 25.1 |
Expected return on plan assets | (1.0) |  |  | (1.5) |  |  | (0.5) |
Amortization of prior service credit | (46.4) |  |  | (17.3) |  |  | (8.7) |
Net actuarial (gain) loss | (54.5) |  |  | 16.5 |  |  | 78.3 |
Net periodic postretirement benefit (benefit) cost | $ | (90.4) |  |  | $ | 21.7 |  |  | $ | 99.0 |
Net periodic pension cost (benefit) included the following components:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
| (Dollars in millions)
Service cost for benefits earned | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 2.0 |
Interest cost on projected benefit obligation | 20.4 |  |  | 28.0 |  |  | 33.5 |
Expected return on plan assets | (22.9) |  |  | (29.7) |  |  | (31.4) |
Settlement | — |  |  | (2.7) |  |  | — |
Net actuarial loss (gain) | 12.7 |  |  | (25.6) |  |  | (16.6) |
Net periodic pension cost (benefit) | $ | 10.4 |  |  | $ | (29.7) |  |  | $ | (12.5) |
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,
| 2021 |  | 2020
| (Dollars in millions)
Change in benefit obligation: |  |  |
Accumulated postretirement benefit obligation at beginning of period | $ | 476.6 |  |  | $ | 659.9 |
Service cost | 1.0 |  |  | 3.8 |
Interest cost | 10.5 |  |  | 20.2 |
Participant contributions | 0.1 |  |  | 2.4 |
Plan amendments | (139.5) |  |  | (185.4) |
Benefits paid and administrative fees (net of Medicare Part D reimbursements) | (34.5) |  |  | (42.9) |
Actuarial (gain) loss | (55.5) |  |  | 18.6 |
Accumulated postretirement benefit obligation at end of period | 258.7 |  |  | 476.6 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of period | 33.7 |  |  | 34.2 |
Actual return on plan assets | — |  |  | 3.6 |
Employer contributions | 26.8 |  |  | 36.4 |
Participant contributions | 0.1 |  |  | 2.4 |
Benefits paid and administrative fees (net of Medicare Part D reimbursements) | (34.5) |  |  | (42.9) |
Fair value of plan assets at end of period | 26.1 |  |  | 33.7 |
Funded status at end of period | (232.6) |  |  | (442.9) |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 20.5 |  |  | 29.7 |
Noncurrent obligation (included in “Accrued postretirement benefit costs”) | $ | (212.1) |  |  | $ | (413.2) |
The following summarizes the change in benefit obligation, change in plan assets and funded status of the Pension Plans:
| December 31,
| 2021 |  | 2020
| (Dollars in millions)
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | $ | 816.4 |  |  | $ | 853.8 |
Service cost | 0.2 |  |  | 0.3 |
Interest cost | 20.4 |  |  | 28.0 |
Benefits paid | (55.9) |  |  | (57.5) |
Actuarial (gain) loss | (29.4) |  |  | 43.4 |
Settlement | — |  |  | (51.6) |
Projected benefit obligation at end of period | 751.7 |  |  | 816.4 |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of period | 847.5 |  |  | 855.2 |
Actual return on plan assets | (19.2) |  |  | 101.4 |
Benefits paid | (55.9) |  |  | (57.5) |
Settlement | — |  |  | (51.6) |
Fair value of plan assets at end of period | 772.4 |  |  | 847.5 |
Funded status at end of period | $ | 20.7 |  |  | $ | 31.1 |
Amounts recognized in the consolidated balance sheets: |  |  |
Noncurrent asset (included in “Investments and other assets”) | $ | 28.5 |  |  | $ | 39.6 |
Noncurrent obligation (included in “Other noncurrent liabilities”) | (7.8) |  |  | (8.5) |
Net amount recognized | $ | 20.7 |  |  | $ | 31.1 |
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,
| 2021 |  | 2020
Discount rate | 2.84 | % |  | 2.55 | %
Measurement date | December 31, 2021 |  | December 31, 2020
The weighted-average assumptions used to determine net periodic benefit (benefit) cost for the plans during each period were as follows:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Discount rate | 2.55 | % |  | 3.40 | % |  | 4.35 | %
Expected long-term return on plan assets (pre-tax) | 5.75 | % |  | 7.00 | % |  | 5.00 | %
Measurement date | December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
| December 31,
| 2021 |  | 2020
Discount rate | 2.95 | % |  | 2.60 | %
Measurement date | December 31, 2021 |  | December 31, 2020
The weighted-average assumptions used to determine net periodic pension cost benefit during each period were as follows:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Discount rate | 2.60 | % |  | 3.40 | % |  | 4.35 | %
Expected long-term return on plan assets | 2.80 | % |  | 3.60 | % |  | 4.20 | %
Measurement date | December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
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, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Corporate bonds | $ | — |  |  | $ | 537.5 |  |  | $ | — |  |  | $ | 537.5 |
U.S. government securities | 125.2 |  |  | 22.5 |  |  | — |  |  | 147.7 |
International government securities | — |  |  | 15.5 |  |  | — |  |  | 15.5 |
Asset-backed securities | — |  |  | 3.3 |  |  | — |  |  | 3.3 |
Cash funds | 30.7 |  |  | — |  |  | — |  |  | 30.7 |
Real estate interests | — |  |  | — |  |  | 0.3 |  |  | 0.3 |
Total assets at fair value | $ | 155.9 |  |  | $ | 578.8 |  |  | $ | 0.3 |  |  | 735.0 |
Assets measured at net asset value practical expedient (1) |  |  |  |  |  |  |
Private mutual funds |  |  |  |  |  |  | 37.4 |
Total plan assets |  |  |  |  |  |  | $ | 772.4 |
| December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Corporate bonds | $ | — |  |  | $ | 623.3 |  |  | $ | — |  |  | $ | 623.3 |
U.S. government securities | 121.4 |  |  | 21.2 |  |  | — |  |  | 142.6 |
International government securities | — |  |  | 18.7 |  |  | — |  |  | 18.7 |
Asset-backed securities | — |  |  | 4.7 |  |  | — |  |  | 4.7 |
Cash funds | 14.9 |  |  | — |  |  | — |  |  | 14.9 |
Real estate interests | — |  |  | — |  |  | 1.2 |  |  | 1.2 |
Total assets at fair value | $ | 136.3 |  |  | $ | 667.9 |  |  | $ | 1.2 |  |  | 805.4 |
Assets measured at net asset value practical expedient (1) |  |  |  |  |  |  |
Private mutual funds |  |  |  |  |  |  | 42.1 |
Total plan assets |  |  |  |  |  |  | $ | 847.5 |
(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 this table 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,
| 2021 |  | 2020 |  | 2019
| (Dollars in millions)
Balance, beginning of period | $ | 1.2 |  |  | $ | 4.1 |  |  | $ | 6.2 |
Realized gains (losses) | 0.9 |  |  | 1.6 |  |  | (1.0) |
Unrealized (losses) gains relating to investments still held at the reporting date | (0.6) |  |  | (2.1) |  |  | 1.4 |
Purchases, sales and settlements, net | (1.2) |  |  | (2.4) |  |  | (2.5) |
Balance, end of period | $ | 0.3 |  |  | $ | 1.2 |  |  | $ | 4.1 |
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)
2022 | $ | 28.9 |
2023 | 25.8 |
2024 | 24.3 |
2025 | 22.7 |
2026 | 20.8 |
Years 2027-2031 | 81.5 |
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)
2022 | $ | 56.3 |
2023 | 55.3 |
2024 | 54.3 |
2025 | 53.1 |
2026 | 51.8 |
Years 2027-2031 | 236.8 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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