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Short-Duration Insurance Contracts (Tables)
 6 Months Ended
Jun. 30, 2023
Insurance Loss Reserves [Abstract]  
Schedule of Reconciliation of property and casualty unpaid claims and claim expense
The following table is a summary reconciliation of the beginning and ending Property & Casualty unpaid claims and claim expense reserves for the periods indicated. The table presents reserves on both a gross and net (after reinsurance) basis. The total net Property & Casualty insurance claims and claim expense incurred amounts are reflected in the Consolidated Statements of Operations and Comprehensive Income (Loss). The end of period gross reserves (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets.
($ in millions)Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
Property & Casualty  
Beginning gross reserves$397.8 $356.2 $388.7 $362.4 
Less: reinsurance recoverables101.3 108.0 100.8 110.3 
Net reserves, beginning of period(1)
296.5 248.2 287.9 252.1 
Incurred claims and claim expenses:  
Claims occurring in the current period152.0 144.1 280.8 252.4 
Increase (decrease) in estimated reserves for claims occurring in prior periods(2)
— 6.0 — 6.0 
Total claims and claim expenses incurred152.0 150.1 280.8 258.4 
Claims and claim expense payments
for claims occurring during:
  
Current period
90.2 84.4 130.8 118.2 
Prior periods
46.8 45.3 126.4 123.7 
Total claims and claim expense payments137.0 129.7 257.2 241.9 
Net reserves, end of period(1)
311.5 268.6 311.5 268.6 
Plus: reinsurance recoverables104.3 109.8 104.3 109.8 
Ending gross reserves$415.8 $378.4 $415.8 $378.4 
(1)Reserves net of expected reinsurance recoverables.
(2)Shows the amounts by which the Company increased (decreased) its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs - also known as prior years' reserve development.
The following table is a summary reconciliation of the beginning and ending Group Benefits unpaid claims and claim expense reserves for the periods indicated. The table presents reserves on both a gross and net (after reinsurance). The total net Group Benefits insurance claims and claim expense incurred amounts are reflected in the Consolidated Statements of Operations and Comprehensive Income (Loss). The end of period gross reserves (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets.
($ in millions)Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
Group Benefits  
Beginning gross reserves$120.3 $133.2 $121.6 $125.4 
Less: reinsurance recoverables28.0 29.8 27.9 28.6 
Net reserves, beginning of period(1)
92.3 103.4 93.7 96.8 
Incurred claims and claim expenses:  
Claims occurring in the current period20.8 16.2 41.0 44.9 
Increase (decrease) in estimated reserves for claims occurring in prior periods(2)
(3.0)(0.1)(7.9)(2.0)
Total claims and claim expenses incurred17.8 16.1 33.1 42.9 
Claims and claim expense payments
for claims occurring during:
  
Current period
8.9 11.4 13.1 15.8 
Prior periods
7.6 7.5 20.0 23.4 
Total claims and claim expense payments16.5 18.9 33.1 39.2 
Net reserves, end of period(1)
93.7 100.6 93.7 100.6 
Plus: reinsurance recoverables28.2 29.6 28.2 29.6 
Ending gross reserves$121.9 $130.2 $121.9 $130.2 
(1) Reserves net of expected reinsurance recoverables.
(2) Shows the amounts by which the Company increased (decreased) its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs - also known as prior years' reserve development.
Schedule of Reconciliation of Net Incurred and Paid Claims Development To Liability for Claims and Claim Adjustment Expenses
($ in millions)As of June 30, 2023As of December 31, 2022
Ending gross reserves
Property & Casualty$415.8 $388.7 
Group Benefits121.9 121.6 
Total short-duration insurance contracts537.7 510.3 
Other than short-duration(1)
60.1 53.7 
Total unpaid claims and claims expenses$597.8 $564.0 
(1) This line includes Life & Retirement, Supplemental, and other certain group benefit reserves.