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Pension, Health Care and Other Postretirement Benefits - Summary of the Components of Net Periodic Benefit Cost and Cumulative Other Comprehensive Loss Related to Postretirement Benefits Other than Pensions (Details) - Postretirement Benefits Other than Pensions - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net periodic benefit cost: |  |  |
Service cost | $ 1.4 | $ 1.5 | $ 1.5
Interest cost | 4.9 | 7.6 | 11.2
Amortization of actuarial losses | 4.7 | 2.0 | 0.5
Amortization of prior service cost (credit) | 0.3 | (1.1) | (5.0)
Net periodic benefit cost | 11.3 | 10.0 | 8.2
Other changes in projected benefit obligation recognized in AOCI (before taxes): |  |  |
Net actuarial (gain) loss arising during the year | (4.1) | 19.7 | 12.8
Prior service (credit) cost arising during the year | (2.2) | 0.9 |
Amortization of actuarial losses | (4.7) | (2.0) | (0.5)
Amortization of prior service credit | (0.3) | 1.1 | 5.0
Total recognized in AOCI | (11.3) | 19.7 | 17.3
Total recognized in net pension cost and AOCI | $ 0.0 | $ 29.7 | $ 25.5

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