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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Liabilities recognized in the Consolidated Balance Sheets: |  |  |
Other accruals | $ (1,005.8) | $ (1,127.9) | $ (1,001.1)
Postretirement benefits other than pensions | (259.4) | (275.6) | (263.0)
Postretirement Benefits Other than Pensions |  |  |
Benefit obligation: |  |  |
Balances at beginning of year | 291.6 | 280.5 | 274.6
Service cost | 1.4 | 1.5 | 1.5
Interest cost | 4.9 | 7.6 | 11.2
Actuarial (gain) loss | (4.1) | 19.7 | 12.8
Plan amendments | (2.2) | 1.0 |
Benefits paid | (15.2) | (18.7) | (19.6)
Balances at end of year | 276.4 | 291.6 | 280.5
Liabilities recognized in the Consolidated Balance Sheets: |  |  |
Other accruals | (17.0) | (16.0) | (17.5)
Postretirement benefits other than pensions | (259.4) | (275.6) | (263.0)
Total liabilities recognized | (276.4) | (291.6) | (280.5)
Amounts recognized in AOCI: |  |  |
Net actuarial losses | (54.0) | (62.8) | (45.1)
Prior service credit (cost) | 1.6 | (0.9) | 1.1
Total amounts recognized | $ (52.4) | $ (63.7) | $ (44.0)
Weighted-average assumptions used to determine benefit obligation: |  |  |
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%
Employer Group Waiver Plan (EGWP) trend rate | 8.25% | 8.25% | 9.00%
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 2.49% | 3.22% | 4.21%
Health care cost trend rate - pre-65 | 6.06% | 6.38% | 6.69%
Health care cost trend rate - post-65 | 5.13% | 5.25% | 4.94%
Prescription drug cost increases | 8.25% | 9.00% | 9.75%

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