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Short-Duration Insurance Contracts (Tables)
 12 Months Ended
Dec. 31, 2024
Insurance Loss Reserves [Abstract]  
Schedule of Reconciliation of Property and Casualty Unpaid Claims and Claim Expenses
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 the year gross reserve (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets. Also included in property & casualty claims and claim expense reserves are legacy commercial line exposures, which are included in the Corporate & Other segment for segment reporting purposes.
($ in millions)Years Ended December 31,
202420232022
Property & Casualty
Gross reserves, beginning of year$416.8 $388.7 $362.4 
Less: reinsurance recoverables104.0 100.8 110.3 
Net reserves, beginning of year(1)
312.8 287.9 252.1 
Incurred claims and claim expenses:
Claims occurring in the current year552.8 557.0 512.3 
Increase (decrease) in estimated reserves for claims occurring in prior years(2)
(11.8)— 22.0 
Total claims and claim expenses incurred541.0 557.0 534.3 
Claims and claim expense payments for claims occurring during:
Current year
368.1 353.1 320.0 
Prior years
165.9 179.0 178.5 
Total claims and claim expense payments
534.0 532.1 498.5 
Net reserves, end of year319.8 312.8 287.9 
Plus: reinsurance recoverables100.8 104.0 100.8 
Gross reserves, end of year$420.6 $416.8 $388.7 
(1)    Reserves are net of anticipated reinsurance recoverables. Starting in 2024, includes reserves for legacy commercial lines.
(2)    Shows the amounts by which the Company increased (decreased) its reserves in each of the periods indicated for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs. Also, refer to the paragraphs below for additional information regarding prior years' reserve development recognized in 2024, 2023 and 2022.
The following table is a summary reconciliation of the beginning and ending Group Benefits unpaid claims and claim expense reserves for the year ended December 31, 2024. The table presents reserves on both a gross and net (after reinsurance) basis. The total net Group Benefits insurance claims and claim expense incurred amounts are reflected in the Consolidated Statements of Operations and Comprehensive Income (Loss). The end of the year gross reserve (before reinsurance balances and reinsurance recoverable balances) are reflected on a gross basis in the Consolidated Balance Sheets.
($ in millions)Year Ended December 31,
20242023
Group Benefits
Gross reserves, beginning of year$116.6 $121.6 
Less: reinsurance recoverables27.7 27.9 
Net reserves, beginning of year(1)
88.9 93.7 
Incurred claims and claim expenses:
Claims occurring in the current year66.3 73.6 
Increase (decrease) in estimated reserves for claims occurring in prior years(2)
(14.5)(13.9)
Total claims and claim expenses incurred51.8 59.7 
Claims and claim expense payments for claims occurring during:
Current year
31.1 33.8 
Prior years
29.9 30.7 
Total claims and claim expense payments
61.0 64.5 
Net reserves, end of year79.7 88.9 
Plus: reinsurance recoverables25.2 27.7 
Gross reserves, end of year$104.9 $116.6 
(1)    Reserves are net of anticipated reinsurance recoverables.
(2)    Shows the amounts by which the Company increased (decreased) its reserves for claims occurring in previous periods to reflect subsequent information on such claims and changes in their projected final settlement costs. Also, refer to the paragraphs below for additional information regarding prior years' reserve development recognized in 2024.
Schedule of Average Annual Percentage Payout of Incurred Claims by Age, Also Referred to as a History of Claims Duration
Below is the average annual percentage payout of incurred claims by age, also referred to as a history of claims duration:
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years1 2 3 4 5 6 7 8 910
Homeowners78.2 %18.4 %2.2 %0.6 %0.4 %— 0.1 %— 0.1 %—
Auto liability37.2 %35.3 %14.9 %6.8 %3.2 %1.7 %0.5 %0.2 %0.1 %0.1%
Auto physical damage94.8 %5.7 %(0.5)%— — — — — — —
Below is the average annual percentage payout of incurred claims by age for Group Benefits, also referred to as a history of claims duration:
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance
Years1 2 3 4 5 6 7 8 910
Specialty health69.4 %28.5 %1.1 %0.8 %0.1 %0.1 %— — — — 
Group disability30.1 %32.7 %9.7 %3.9 %3.2 %3.0 %2.9 %2.2 %2.0 %1.7 %
The information about incurred and paid claims development for the years ended December 31, 2015 to 2023 is presented as unaudited supplementary information.
($ in millions)
Specialty Health 
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance
Years Ended December 31,
As of December 31, 2024
Total of Incurred-
But-Not-Reported
Liabilities Plus
Expected Development
on Reported Claims		Cumulative
Number of
Reported Claims
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited
Year2015201620172018201920202021202220232024
(Actual)
2015$33.3 $30.9 $30.3 $30.3 $30.3 $30.4 $30.4 $30.4 $30.4 $30.4 $— 183,433 
2016 12.5 11.2 11.1 11.1 11.1 11.1 11.1 11.1 11.1 — 67,274 
2017  10.6 9.7 9.6 9.6 9.6 9.6 9.6 9.6 — 63,494 
2018   12.9 13.2 13.0 12.7 12.6 12.6 12.6 — 95,219 
2019    10.6 9.5 9.6 9.5 9.5 9.5 — 72,759 
2020     6.8 5.8 5.7 5.7 5.7 — 43,616 
2021      22.8 17.7 16.1 15.3 0.1 73,152 
2022       22.6 18.0 17.7 0.5 121,749 
2023        16.0 14.1 1.3 99,201 
2024         11.3 5.5 32,041 
         Total$137.3   
($ in millions)
Specialty Health  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance  
Years Ended December 31,  
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited  
Year2015201620172018201920202021202220232024  
2015$24.9 $30.4 $30.3 $30.3 $30.3 $30.4 $30.4 $30.4 $30.4 $30.4   
2016 5.5 11.0 11.1 11.1 11.1 11.1 11.1 11.1 11.1   
2017  7.3 9.4 9.6 9.6 9.6 9.6 9.6 9.6   
2018   8.8 12.1 12.5 12.6 12.6 12.6 12.6   
2019    7.5 9.3 9.5 9.5 9.5 9.5   
2020     4.2 5.6 5.7 5.7 5.7   
2021      2.9 12.9 13.7 15.2   
2022       10.5 16.7 17.2   
2023        8.8 12.9   
2024         5.8   
        Total130.0   
Outstanding prior to 2015
— 
        Prior years paid—   
Liabilities for claims and claim adjustment expenses, net of reinsurance$7.3 
($ in millions)
Group Disability 
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance
Years Ended December 31,
As of December 31, 2024
Total of Incurred-
But-Not-Reported
Liabilities Plus
Expected Development
on Reported Claims		Cumulative
Number of
Reported Claims
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited
Year2015201620172018201920202021202220232024
(Actual)
2015$25.3 $19.2 $16.6 $14.7 $14.6 $15.2 $15.2 $14.7 $14.5 $14.0 $— 3,347 
2016 28.5 28.6 27.4 26.0 26.3 26.8 28.1 28.1 26.9 — 3,619 
2017  29.9 26.0 22.9 22.4 23.3 24.0 23.1 22.7 — 3,906 
2018   29.8 26.6 23.2 22.7 23.3 23.6 23.8 0.5 4,175 
2019    34.5 33.5 30.2 29.9 30.2 30.4 0.2 4,560 
2020     36.7 34.3 34.1 33.2 32.4 0.2 4,357 
2021      37.8 41.3 41.3 37.3 0.4 5,118 
2022       39.2 32.0 31.0 0.6 4,368 
2023        40.3 36.5 1.9 4,410 
2024           38.7 12.1 3,589 
         Total$293.7   
($ in millions)
Group Disability  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance  
Years Ended December 31,  
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited  
Year2015201620172018201920202021202220232024  
2015$6.8 $14.0 $16.6 $17.2 $17.6 $18.1 $18.6 $18.9 $19.1 $19.4   
2016 8.3 16.4 19.3 20.3 21.1 21.8 22.4 22.9 23.3   
2017  8.5 16.1 17.9 18.3 18.9 19.4 19.7 19.9   
2018   8.4 16.1 18.0 18.9 19.6 20.1 20.3   
2019    11.8 22.8 24.3 24.7 25.2 25.7   
2020     12.4 22.7 25.5 26.4 26.9   
2021      11.8 24.0 26.7 27.4   
2022       11.7 21.4 23.7   
2023        12.2 22.4   
2024         13.0   
        Total222.0   
Outstanding prior to 2015
6.2 
        Prior years paid114.9   
Liabilities for claims and claim adjustment expenses, net of reinsurance$77.9 
Effect of discounting(14.6)
Discounted net reserves $63.3 
Schedule of Short-Duration Insurance Contracts, Claims Development
The following tables illustrate the incurred and paid claims development by accident year on a net basis for the lines of homeowners, auto liability and auto physical damage. Conditions and trends that have affected the development of these reserves in the past will not necessarily reoccur in the future. It may not be appropriate to use this cumulative history in the projection of future performance.
The information about incurred and paid claims development for the years ended December 31, 2015 to 2023 is presented as unaudited supplementary information.
($ in millions)
Homeowners 
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance
Years Ended December 31,As of December 31, 2024
Total of Incurred-
But-Not-Reported
Liabilities Plus
Expected Development
on Reported Claims		Cumulative
Number of
Reported Claims
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited
Year2015201620172018201920202021202220232024
(Actual)
2015$111.7 $115.1 $114.4 $114.1 $115.1 $114.9 $114.9 $114.9 $114.9 $114.9 $— 18,176 
2016 115.9 118.6 117.0 117.9 117.9 117.9 118.1 118.1 118.1 — 19,866 
2017  126.3 129.8 132.7 130.7 130.8 130.8 131.3 131.1 — 19,867 
2018   166.8 157.4 158.9 158.1 157.2 156.0 156.1 — 21,150 
2019    130.4 129.9 132.1 130.9 131.1 131.3 0.3 17,578 
2020     155.7 151.9 145.4 146.9 146.1 0.6 19,731 
2021      150.2 150.7 154.3 154.4 1.0 16,683 
2022       162.2 156.2 152.1 2.4 14,581 
2023        183.1 172.6 9.2 16,622 
2024         172.7 33.1 15,568 
         Total$1,449.4   
($ in millions)
Homeowners  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance  
Years Ended December 31,  
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited  
Year2015201620172018201920202021202220232024  
2015$90.7 $109.3 $111.9 $113.3 $114.6 $114.9 $114.7 $114.7 $114.9 $114.9   
2016 95.8 113.2 115.1 117.5 117.7 117.8 118.0 118.1 118.1   
2017  106.8 128.5 129.8 130.0 130.5 130.7 131.2 131.2   
2018   130.5 152.4 157.0 157.4 157.2 156.2 156.3   
2019    103.8 126.2 129.1 130.0 130.4 130.8   
2020     106.8 138.7 144.0 145.6 145.8   
2021      114.9 146.3 151.0 152.5   
2022       108.3 144.8 149.3   
2023        126.3 161.7   
2024         125.5   
        Total1,386.1   
Outstanding prior to 2015
— 
        Prior years paid—   
Liabilities for claims and claim adjustment expenses, net of reinsurance$63.3 
($ in millions)
Automobile Liability 
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 
Years Ended December 31,As of December 31, 2024
Total of Incurred-
But-Not-Reported
Liabilities Plus
Expected Development
on Reported Claims		Cumulative
Number of
Reported Claims
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited
Year2015201620172018201920202021202220232024
(Actual)
2015$165.5 $172.6 $177.0 $178.3 $178.7 $179.2 $178.9 $178.8 $178.9 $178.9 $0.1 50,638 
2016 180.4 184.4 184.6 186.6 188.1 189.2 189.6 189.5 189.7 0.2 52,053 
2017  188.0 188.8 188.6 189.1 191.7 192.9 192.5 192.5 0.2 49,021 
2018   200.3 195.3 192.9 189.8 192.0 192.3 192.3 0.6 47,514 
2019    181.1 180.1 176.7 181.5 181.2 181.0 1.7 46,313 
2020     137.0 134.9 136.3 137.3 136.7 2.1 32,121 
2021      142.2 157.8 156.7 154.7 5.0 34,499 
2022       165.6 166.1 161.1 11.8 32,151 
2023        176.4 173.0 29.4 32,081 
2024         175.6 65.1 30,126 
         Total$1,735.5   
($ in millions)
Automobile Liability  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance  
Years Ended December 31,  
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited  
Year2015201620172018201920202021202220232024  
2015$70.8 $134.5 $158.0 $170.1 $174.5 $176.7 $177.7 $178.3 $178.6 $178.7   
2016 73.1 140.9 166.8 177.8 184.5 188.1 189.0 189.4 189.5   
2017  70.7 139.5 166.6 179.8 185.8 190.8 191.8 192.1   
2018   77.5 141.5 168.6 180.7 188.0 190.6 191.5   
2019    69.7 129.1 155.5 170.9 176.2 178.6   
2020     51.5 94.0 118.2 129.2 133.3   
2021      52.9 112.5 136.5 145.3   
2022       55.8 116.7 140.5   
2023        62.2 123.1   
2024         66.8   
        Total1,539.4   
Outstanding prior to 2015
0.9 
        Prior years paid  
Liabilities for claims and claim adjustment expenses, net of reinsurance$197.0 
($ in millions)
Automobile Physical Damage 
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance 
Years Ended December 31,As of December 31, 2024
Total of Incurred-
But-Not-Reported
Liabilities Plus
Expected Development
on Reported Claims		Cumulative
Number of
Reported Claims
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited
Year2015201620172018201920202021202220232024
(Actual)
2015$99.3 $98.0 $97.6 $97.5 $97.6 $97.6 $97.6 $97.6 $97.6 $97.6 $— 87,506 
2016 112.4 109.5 109.3 109.6 109.6 109.5 109.5 109.6 109.5 — 93,234 
2017  115.5 111.8 110.5 110.6 110.5 110.6 110.6 110.6 — 91,302 
2018   109.0 108.9 108.3 108.3 108.2 108.3 108.3 — 94,483 
2019    111.6 110.5 110.0 110.0 109.9 110.0 — 92,213 
2020     87.0 86.9 87.1 87.0 87.3 — 68,845 
2021      105.0 105.7 105.1 105.4 (0.1)72,727 
2022       125.7 125.5 124.0 0.1 72,982 
2023        132.4 129.4 (0.6)72,436 
2024         130.5 (1.7)67,607 
         Total$1,112.6   
($ in millions)
Automobile Physical Damage  
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance  
Years Ended December 31,  
AccidentUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnauditedUnaudited  
Year2015201620172018201920202021202220232024  
2015$92.1 $97.9 $97.7 $97.6 $97.6 $97.6 $97.6 $97.6 $97.6 $97.6   
2016 106.5 109.7 109.5 109.6 109.6 109.6 109.5 109.5 109.5   
2017 105.2 110.8 110.7 110.6 110.6 110.6 110.6 110.6   
2018 103.6 109.1 108.3 108.3 108.2 108.2 108.2   
2019 106.2 110.7 110.1 110.1 110.1 110.0   
2020 84.1 87.6 87.4 87.3 87.3   
2021 97.3 105.8 105.4 105.4   
2022 114.6 124.3 123.8   
2023 122.0 129.9   
2024 120.5   
        Total1,102.8   
Outstanding prior to 2015
— 
Prior years paid— 
Liabilities for claims and claim adjustment expenses, net of reinsurance$9.8 
Schedule of Reconciliation of the Net Incurred and Paid Claims Development Tables to the Liability for Claims and Claim Adjustment Expenses
Reconciliation of Net Incurred and Paid Claims Development Tables for Property & Casualty and Group Benefits to Unpaid Claims and Claim Expense Reserves in the Consolidated Balance Sheet
($ in millions)Year Ended December 31,
20242023
Property & Casualty and Group Benefits
Net reserves
Homeowners$63.3 $73.4 
Auto liability197.0 200.9 
Auto physical damage9.8 11.0 
Specialty health7.3 10.9 
Group disability77.9 83.2 
Other than short duration lines
15.3 11.0 
Legacy commercial exposures
17.7 — 
Total net reserves for unpaid claims and claim adjustment expenses, net of reinsurance388.3 390.4 
Reinsurance recoverable on unpaid claims
Homeowners0.7 2.2 
Auto liability92.5 96.6 
Specialty health0.1 0.2 
Group disability22.6 25.0 
Other short duration lines12.8 14.9 
Total reinsurance recoverable on unpaid claims128.7 138.9 
Insurance lines other than short duration(1)
41.0 41.1 
Unallocated claims adjustment expenses11.2 11.3 
Total other than short duration and unallocated claims adjustment expenses52.2 52.4 
Gross reserves, end of year(1)
$569.2 $581.7 
(1)    This line includes Life & Retirement and Supplemental reserves included in the Consolidated Balance Sheet.