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v3.22.4

Postretirement Health Care and Life Insurance Benefits - Reconciliation of Postretirement Plans' Funded Status to the Balance Sheet (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2023 | Jan. 01, 2022
Change in plan assets: |  |  |  |  |
Average remaining service period (in years) |  |  |  | 1 year 10 months 24 days | 2 years 10 months 24 days
Postretirement Health Care and Life Insurance Benefits |  |  |  |  |
Change in benefit obligation: |  |  |  |  |
Accumulated postretirement benefit obligation at beginning of period | $ 258.7 | $ 476.6 |  |  |
Service cost | 0.8 | 1.0 | $ 3.8 |  |
Interest cost | 7.0 | 10.5 | 20.2 |  |
Participant contributions | 0.0 | 0.1 |  |  |
Plan amendments | 0.0 | 139.5 | 185.4 |  |
Benefits paid | (21.2) | (34.5) |  |  |
Actuarial gain | (55.4) | (55.5) |  |  |
Accumulated postretirement benefit obligation at end of period | 189.9 | 258.7 | 476.6 |  |
Change in plan assets: |  |  |  |  |
Fair value of plan assets at beginning of period | 26.1 | 33.7 |  |  |
Actual return on plan assets | (3.4) | 0.0 |  |  |
Employer contributions | 15.9 | 26.8 |  |  |
Participant contributions | 0.0 | 0.1 |  |  |
Benefits paid and administrative fees (net of Medicare Part D reimbursements) | (21.2) | (34.5) |  |  |
Fair value of plan assets at end of period | 17.4 | 26.1 | 33.7 |  |
Funded status at end of period | (172.5) | (232.6) |  |  |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 16.0 | 20.5 |  |  |
Noncurrent obligation (included in “Accrued postretirement benefit costs”) | $ (156.5) | (212.1) |  |  |
Average remaining service period (in years) |  |  |  | 13 years | 14 years
Postretirement Health Care and Life Insurance Benefits | Retirement Plan Amendment One |  |  |  |  |
Change in benefit obligation: |  |  |  |  |
Plan amendments |  |  | $ 174.5 |  |
Change in plan assets: |  |  |  |  |
Average remaining service period (in years) |  |  |  | 2 years 10 months 24 days | 3 years 10 months 24 days
Postretirement Health Care and Life Insurance Benefits | Retirement Plan Amendment Two |  |  |  |  |
Change in benefit obligation: |  |  |  |  |
Plan amendments |  | $ 10.9 |  |  |
Change in plan assets: |  |  |  |  |
Average remaining service period (in years) |  |  |  | 8 years 6 months | 9 years 6 months

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