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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Schedule of accumulated other comprehensive income (loss) The following table reconciles these components.
($ in millions)
Net Unrealized Investment
 Gains (Losses)
 on Securities(1)
Net Funded Status of
Benefit Plans(1)
Total(1)
Beginning balance, April 1, 2021$243.6 $(11.2)$232.4 
Other comprehensive income (loss) before reclassifications93.3 — 93.3 
Amounts reclassified from AOCI(2)
(4.7)— (4.7)
Net current period other comprehensive income (loss)
88.6 — 88.6 
Ending balance, June 30, 2021$332.2 $(11.2)$321.0 
Beginning balance, April 1, 2020$136.6 $(10.7)$125.9 
Other comprehensive income (loss) before reclassifications147.5 — 147.5 
Amounts reclassified from AOCI(3)
(5.0)— (5.0)
Net current period other comprehensive income (loss)142.5 — 142.5 
Ending balance, June 30, 2020$279.1 $(10.7)$268.4 
Beginning balance, January 1, 2021$366.3 $(11.2)$355.1 
Other comprehensive income (loss) before reclassifications(35.8)— (35.8)
Amounts reclassified from AOCI(2)
1.7 — 1.7 
Net current period other comprehensive income (loss)
(34.1)— (34.1)
Ending balance, June 30, 2021$332.2 $(11.2)$321.0 
Beginning balance, January 1, 2020$230.4 $(10.7)$219.7 
Other comprehensive income (loss) before reclassifications43.0 — 43.0 
Amounts reclassified from AOCI(3)
5.7 — 5.7 
Net current period other comprehensive income (loss)48.7 — 48.7 
Ending balance, June 30, 2020$279.1 $(10.7)$268.4 
(1)All amounts are net of tax.
(2)The pretax amounts reclassified from AOCI, $5.9 million and $(2.2) million, are included in Net investment gains (losses) and the related income tax expenses, $1.2 million and $(0.5) million, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2021, respectively.
(3)    The pretax amounts reclassified from AOCI, $6.4 million and $(7.2) million, are included in Net investment gains (losses) and the related income tax expenses, $1.4 million and $(1.5) million, are included in Income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2020, respectively.