THG 2018 Annual Report

10. OTHER COMPREHENSIVE INCOME The following table provides changes in other comprehensive income. YEARS ENDED DECEMBER 31 2018 2017 2016 Tax Tax Tax Benefit Net of Benefit Net of Benefit Net of (in millions) Pre-Tax (Expense) Tax Pre-Tax (Expense) Tax Pre-Tax (Expense) Tax Unrealized gains (losses) on available- for-sale securities: Unrealized gains (losses) arising during period $(209.7) $ 44.0 $(165.7) $ 77.0 $ (27.9) $ 49.1 $ 95.9 $ (33.4) $ 62.5 Amount of realized (gains) losses from sales and other 2.5 (9.7) (7.2) (30.8) (1.4) (32.2) (36.5) (8.0) (44.5) Portion of other-than-temporary impairment losses recognized in earnings 3.5 (0.7) 2.8 3.9 (1.4) 2.5 27.9 (9.8) 18.1 Unrealized losses (gains) realized with sale of Chaucer business 24.2 (5.1) 19.1 ² ² ² ² ² ² Net unrealized gains (losses) (179.5) 28.5 (151.0) 50.1 (30.7) 19.4 87.3 (51.2) 36.1 Pension and postretirement benefits: Net gains (losses) arising in the period from net actuarial (gains) losses and prior service costs (21.3) 4.3 (17.0) 17.0 (3.4) 13.6 (43.1) 12.8 (30.3) Amortization of net actuarial losses (gains) and prior service costs recognized as net periodic benefit cost 9.7 (2.0) 7.7 14.0 (4.6) 9.4 9.9 (3.5) 6.4 Pension obligations recognized with sale of Chaucer business 21.2 (4.8) 16.4 ² ² ² ² ² ² Total pension and postretirement benefits 9.6 (2.5) 7.1 31.0 (8.0) 23.0 (33.2) 9.3 (23.9) Cumulative foreign currency translation adjustment: Foreign currency translation recognized during the period (2.2) 0.5 (1.7) 3.7 (1.3) 2.4 (5.1) 1.8 (3.3) Currency translation obligation recognized with sale of Chaucer business 29.4 (6.2) 23.2 ² ² ² ² ² ² Total cumulative foreign currency translation adjustment 27.2 (5.7) 21.5 3.7 (1.3) 2.4 (5.1) 1.8 (3.3) Other comprehensive income (loss) $(142.7) $ 20.3 $(122.4) $ 84.8 $ (40.0) $ 44.8 $ 49.0 $ (40.1) $ 8.9 113 2018 ANNUAL REPORT | THE HANOVER INSURANCE GROUP