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Pension, Health Care and Postretirement Benefits Other Than Pensions - Summary of the Obligation and the Assumptions Used for Postretirement Benefits Other than Pensions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liabilities recognized in the Consolidated Balance Sheets: |  |  |
Postretirement benefits other than pensions | $ (263.0) | $ (257.6) | $ (274.7)
Other accruals | (989.1) | (1,141.1) | (972.7)
Postretirement Benefits Other than Pensions |  |  |
Benefit obligation: |  |  |
Balances at beginning of year | 274.6 | 290.8 | 265.1
Service cost | 1.5 | 2.0 | 2.1
Interest cost | 11.2 | 10.2 | 10.8
Acquisition |  |  | 17.0
Actuarial loss (gain) | 12.8 | (9.1) | 11.6
Plan amendments |  | (0.1) |
Benefits paid | (19.6) | (19.2) | (15.8)
Balances at end of year | 280.5 | 274.6 | 290.8
Liabilities recognized in the Consolidated Balance Sheets: |  |  |
Postretirement benefits other than pensions | (263.0) | (257.6) | (274.7)
Other accruals | (17.5) | (17.0) | (16.1)
Total liabilities recognized | (280.5) | (274.6) | (290.8)
Amounts recognized in AOCI: |  |  |
Net actuarial losses | (45.1) | (32.8) | (44.1)
Prior service credits | 1.1 | 6.1 | 12.6
Total amounts recognized | $ (44.0) | $ (26.7) | $ (31.5)
Weighted-average assumptions used to determine benefit obligation: |  |  |
Discount rate | 3.22% | 4.21% | 3.61%
Health care cost trend rate - pre-65 | 6.38% | 6.69% | 7.00%
Health care cost trend rate - post-65 | 5.25% | 4.94% | 5.00%
Prescription drug cost increases | 9.00% | 9.75% | 11.00%
Employer Group Waiver Plan (EGWP) trend rate | 9.00% | 9.75% | 11.00%
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |
Discount rate | 4.21% | 3.61% | 4.10%
Health care cost trend rate - pre-65 | 6.69% | 7.00% | 6.00%
Health care cost trend rate - post-65 | 4.94% | 5.00% | 5.50%
Prescription drug cost increases | 9.75% | 11.00% | 10.50%

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