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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 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, July 1, 2021$332.2 $(11.2)$321.0 
Other comprehensive income (loss) before reclassifications(29.3)— (29.3)
Amounts reclassified from AOCI(2)
4.0 — 4.0 
Net current period other comprehensive income (loss)
(25.3)— (25.3)
Ending balance, September 30, 2021$306.9 $(11.2)$295.7 
Beginning balance, July 1, 2020$279.1 $(10.7)$268.4 
Other comprehensive income (loss) before reclassifications54.3 — 54.3 
Amounts reclassified from AOCI(3)
(5.2)— (5.2)
Net current period other comprehensive income (loss)49.1 — 49.1 
Ending balance, September 30, 2020$328.2 $(10.7)$317.5 
Beginning balance, January 1, 2021$366.3 $(11.2)$355.1 
Other comprehensive income (loss) before reclassifications(65.0)— (65.0)
Amounts reclassified from AOCI(2)
5.6 — 5.6 
Net current period other comprehensive income (loss)
(59.4)— (59.4)
Ending balance, September 30, 2021$306.9 $(11.2)$295.7 
Beginning balance, January 1, 2020$230.4 $(10.7)$219.7 
Other comprehensive income (loss) before reclassifications97.3 — 97.3 
Amounts reclassified from AOCI(3)
0.5 — 0.5 
Net current period other comprehensive income (loss)97.8 — 97.8 
Ending balance, September 30, 2020$328.2 $(10.7)$317.5 
(1)All amounts are net of tax.
(2)The pretax amounts reclassified from AOCI, $(5.0) million and $(7.1) million, are included in Net investment gains (losses) and the related income tax expenses, $(1.0) million and $(1.5) million, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2021, respectively.
(3)    The pretax amounts reclassified from AOCI, $6.6 million and $(0.6) million, are included in Net investment gains (losses) and the related income tax expenses, $1.4 million and $(0.1) million, are included in Income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2020, respectively.