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Consolidated Statements of Comprehensive Income Statement - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net Income (Loss) As Reported $ 558.6 $ 1,056.4 $ 370.5
Unrealized gains (loses) before reclassifications, not included in the statements of income 335.5 357.2 (226.4)
Amounts reclassified as realized investment (gains) losses in the statements of income 7.1 6.5 3.1
Pretax unrealized gains (losses) on securities 342.7 363.8 (223.2)
Deferred income taxes (credits) 72.3 76.6 (46.9)
Net unrealized gains (losses) on securities, net of tax 270.3 287.2 (176.3)
Net pension adjustment before reclassifications (88.4) (11.0) 3.6
Amounts reclassified as underwriting, acquisition, and other expenses in the statements of income 3.6 4.1 3.2
Net adjustment related to defined benefit pension plans (84.8) (6.8) 6.9
Deferred income taxes (credits) (17.8) (1.4) 1.4
Net adjustment related to defined benefit pension plans, net of tax (67.0) (5.4) 5.4
Foreign currency translation and other adjustments 2.9 5.9 (11.1)
Total other comprehensive income (loss) 206.3 287.7 (182.0)
Comprehensive Income (Loss) $ 765.0 $ 1,344.2 $ 188.5