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Pension, Health Care and Other Postretirement Benefits - Summary of the Obligation and the Assumptions Used for Postretirement Benefits Other than Pensions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Liabilities recognized in the Consolidated Balance Sheets: |  |  |
Other accruals | $ (1,138.3) | $ (1,005.8) | $ (1,127.9)
Postretirement benefits other than pensions | (139.3) | (259.4) | (275.6)
Postretirement Benefits Other than Pensions |  |  |
Benefit obligation: |  |  |
Balances at beginning of year | 276.4 | 291.6 | 280.5
Service cost | 1.2 | 1.4 | 1.5
Interest cost | 6.0 | 4.9 | 7.6
Actuarial (gain) loss | (54.5) | (4.1) | 19.7
Plan amendments | (62.8) | (2.2) | 1.0
Benefits paid | (12.5) | (15.2) | (18.7)
Balances at end of year | 153.8 | 276.4 | 291.6
Liabilities recognized in the Consolidated Balance Sheets: |  |  |
Other accruals | (14.5) | (17.0) | (16.0)
Postretirement benefits other than pensions | (139.3) | (259.4) | (275.6)
Total liabilities recognized | (153.8) | (276.4) | (291.6)
Amounts recognized in AOCI: |  |  |
Net actuarial gains (losses) | 4.7 | (54.0) | (62.8)
Prior service credits (cost) | 64.0 | 1.6 | (0.9)
Total amounts recognized | $ 68.7 | $ (52.4) | $ (63.7)
Weighted-average assumptions used to determine benefit obligation: |  |  |
Discount rate | 5.16% | 2.83% | 2.49%
Health care cost trend rate - pre-65 | 6.25% | 6.38% | 6.06%
Health care cost trend rate - post-65 | 5.50% | 5.13% | 5.13%
Prescription drug cost increases | 8.25% | 8.25% | 8.25%
Employer Group Waiver Plan (EGWP) trend rate |  | 8.25% | 8.25%
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 2.83% | 2.49% | 3.22%
Health care cost trend rate - pre-65 | 6.38% | 6.06% | 6.38%
Health care cost trend rate - post-65 | 5.13% | 5.13% | 5.25%
Prescription drug cost increases | 8.25% | 8.25% | 9.00%

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