Accumulated Other Comprehensive Income (Loss) Amounts recognized in AOCI not yet recognized as components of net periodic pension and OPEB cost, pretax, were as follows: As of December 31, 2020 As of December 31, 2019 Pension OPEB Total Pension OPEB Total (In millions) Net actuarial loss (gain) $ 684.6  $ (108.6) $ 576.0  $ 685.7  $ (167.5) $ 518.2  Net prior service cost (benefit) 10.5  (4.0) 6.5  7.1  (4.9) 2.2  Total not yet recognized $ 695.1  $ (112.6) $ 582.5  $ 692.8  $ (172.4) $ 520.4  Changes in plan assets and benefit obligations recognized in OCI, pretax, were as follows: Pension OPEB Total (In millions) Accumulated other comprehensive loss (income) as of December 31, 2018 $ 698.0  $ (197.3) $ 500.7  Amortization of prior service (costs) benefit (1.1) 0.7  (0.4) Amortization of net actuarial (loss) gain (10.4) 14.1  3.7  Net prior service cost (2.0) —  (2.0) Settlement and curtailment (29.8) (0.2) (30.0) Current year actuarial loss (gain) 38.5  7.4  45.9  Foreign currency exchange rate change (0.4) 2.9  2.5  Accumulated other comprehensive loss (income) as of December 31, 2019 $ 692.8  $ (172.4) $ 520.4  Amortization of prior service (costs) benefit (0.3) 0.7  0.4  Amortization of net actuarial (loss) gain (7.3) 14.5  7.2  Net prior service cost 0.8  —  0.8  Current year actuarial loss (gain) 8.1  44.0  52.1  Foreign currency exchange rate change 1.0  0.6  1.6  Accumulated other comprehensive loss (income) as of December 31, 2020 $ 695.1  $ (112.6) $ 582.5  120