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Pension, Health Care and Postretirement Benefits Other Than Pensions - 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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net pension cost (credit): |  |  |
Service cost | $ 1.5 | $ 2.0 | $ 2.1
Interest cost | 11.2 | 10.2 | 10.8
Amortization of actuarial losses | 0.5 | 2.3 |
Amortization of prior service credit | (5.0) | (6.6) | (6.6)
Net periodic benefit cost | 8.2 | 7.9 | 6.3
Settlement credit |  |  | (9.3)
Net pension cost | 8.2 | 7.9 | (3.0)
Other changes in projected benefit obligation recognized in AOCI (before taxes): |  |  |
Net actuarial loss (gain) arising during the year | 12.8 | (9.0) | 11.6
Prior service cost arising during the year |  | (0.1) |
Amortization of actuarial losses | (0.5) | (2.3) |
Settlement cost |  |  | 9.3
Amortization of prior service credit | 5.0 | 6.6 | 6.6
Total recognized in AOCI | 17.3 | (4.8) | 27.5
Total recognized in net pension cost and AOCI | $ 25.5 | $ 3.1 | $ 24.5

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