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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Components of Net Investment Income | The components of net investment income for the following periods were as follows:
($ in millions) |  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Fixed maturity securities |  | $ | 269.2 |  |  | $ | 247.2 |  |  | $ | 235.6 |
Equity securities |  | 6.5 |  |  | 9.0 |  |  | 5.3 |
Limited partnership interests |  | 59.1 |  |  | 40.5 |  |  | 79.0 |
Short-term and other investments |  | 17.2 |  |  | 11.2 |  |  | 11.6 |
Investment expenses |  | (12.1) |  |  | (10.5) |  |  | (10.1) |
Net investment income - investment portfolio |  | 339.9 |  |  | 297.4 |  |  | 321.4 |
Investment income - deposit asset on reinsurance |  | 104.9 |  |  | 103.5 |  |  | 101.1 |
Total net investment income |  | $ | 444.8 |  |  | $ | 400.9 |  |  | $ | 422.5 |
Schedule of Net Investment Gains (Losses) | Net investment losses for the following periods were as follows:
($ in millions) |  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Fixed maturity securities |  | $ | (20.3) |  |  | $ | (29.1) |  |  | $ | (7.7) |
Equity securities |  | (3.9) |  |  | (32.6) |  |  | (0.8) |
Short-term investments and other |  | 0.2 |  |  | 5.2 |  |  | (2.5) |
Net investment losses |  | $ | (24.0) |  |  | $ | (56.5) |  |  | $ | (11.0) |
The breakdown of net investment gains (losses) by transaction type for the following periods were as follows:
($ in millions) |  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Credit loss impairments |  | $ | (0.4) |  |  | $ | (3.1) |  |  | $ | (8.1) |
Intent-to-sell impairments |  | (6.7) |  |  | (7.6) |  |  | (2.3) |
Total impairments |  | (7.1) |  |  | (10.7) |  |  | (10.4) |
Sales and other, net |  | (25.0) |  |  | (17.8) |  |  | 4.3 |
Change in fair value - equity securities |  | 7.9 |  |  | (33.2) |  |  | (2.3) |
Change in fair value and losses realized on settlements - derivatives |  | 0.2 |  |  | 5.2 |  |  | (2.6) |
Net investment losses |  | $ | (24.0) |  |  | $ | (56.5) |  |  | $ | (11.0) |
Schedule of Allowance for Credit Loss Impairments on Fixed Maturity Securities | The following table presents changes in the allowance for credit loss impairments on fixed maturity securities classified as available for sale for the category of other asset-backed securities (no other categories of fixed maturity securities have an allowance for credit loss impairments):
($ in millions) |  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Beginning balance |  | $ | 1.2 |  |  | $ | 7.7 |  |  | $ | — |
Credit losses on fixed maturity securities for which credit losses were not previously reported |  | — |  |  | — |  |  | 8.1 |
Net increases (decreases) related to credit losses previously reported |  | — |  |  | 3.1 |  |  | — |
Reduction of credit allowances related to sales |  | — |  |  | (9.2) |  |  | — |
Write-offs |  | — |  |  | (0.4) |  |  | (0.4) |
Ending balance |  | $ | 1.2 |  |  | $ | 1.2 |  |  | $ | 7.7 |
Schedule of Available-for-sale Securities Reconciliation | Amortized cost, net, gross unrealized investment gains (losses) and fair values of all fixed maturity securities in the portfolio were as follows:
($ in millions) |  | Amortized Cost, net |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2023 |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations: |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 713.4 |  |  | $ | 4.4 |  |  | $ | 64.6 |  |  | $ | 653.2 |
Other, including U.S. Treasury securities |  | 450.8 |  |  | 0.8 |  |  | 62.8 |  |  | 388.8 |
Municipal bonds |  | 1,333.4 |  |  | 28.6 |  |  | 91.9 |  |  | 1,270.1 |
Foreign government bonds |  | 23.1 |  |  | — |  |  | 1.0 |  |  | 22.1 |
Corporate bonds |  | 1,969.9 |  |  | 23.1 |  |  | 220.3 |  |  | 1,772.7 |
Other asset-backed securities |  | 1,162.3 |  |  | 6.0 |  |  | 39.9 |  |  | 1,128.4 |
Totals |  | $ | 5,652.9 |  |  | $ | 62.9 |  |  | $ | 480.5 |  |  | $ | 5,235.3 |
December 31, 2022 |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations: |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 638.2 |  |  | $ | 1.3 |  |  | $ | 69.1 |  |  | $ | 570.4 |
Other, including U.S. Treasury securities |  | 410.0 |  |  | 0.5 |  |  | 67.8 |  |  | 342.7 |
Municipal bonds |  | 1,380.9 |  |  | 16.9 |  |  | 128.1 |  |  | 1,269.7 |
Foreign government bonds |  | 35.1 |  |  | — |  |  | 1.6 |  |  | 33.5 |
Corporate bonds |  | 2,161.2 |  |  | 12.7 |  |  | 272.2 |  |  | 1,901.7 |
Other asset-backed securities |  | 1,131.5 |  |  | 3.6 |  |  | 68.1 |  |  | 1,067.0 |
Totals |  | $ | 5,756.9 |  |  | $ | 35.0 |  |  | $ | 606.9 |  |  | $ | 5,185.0 |
Schedule of Fair Value and Gross Unrealized Losses of Fixed Maturity Securities and Equity Securities in an Unrealized Loss Position | The following table presents the fair value and gross unrealized losses for fixed maturity securities in an unrealized loss position as of December 31, 2023 and 2022. The Company views the decrease in fair value of all fixed maturity securities with unrealized losses as of December 31, 2023 as due to factors other than a credit loss. As of December 31, 2023, the Company has not made the decision to sell and it is more likely than not the Company will not be required to sell the fixed maturity securities with unrealized losses before a recovery of the amortized cost basis. In reaching our conclusion that an allowance for credit is unnecessary, we considered the factors described in the Application of Critical Accounting Estimates - Evaluation of Credit Loss Impairments for Fixed Maturity Securities. The performance of fixed maturity securities has been impacted by the change in interest rates, specifically interest rates being at relatively high levels compared to interest rates at the time of acquisition of the securities. Following significant increases in interest rates throughout 2022, driven mostly by increases in risk-free rates, rates stabilized during 2023 but remain at elevated levels. In consideration of the factors, we expect to receive cash flows sufficient to recover the entire amortized cost basis of the securities in the following table.
($ in millions) |  | 12 months or less |  | More than 12 months |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 45.3 |  |  | $ | 0.8 |  |  | $ | 458.5 |  |  | $ | 63.8 |  |  | $ | 503.8 |  |  | $ | 64.6 |
Other |  | 39.5 |  |  | 0.4 |  |  | 288.0 |  |  | 62.4 |  |  | 327.5 |  |  | 62.8 |
Municipal bonds |  | 64.5 |  |  | 0.9 |  |  | 724.6 |  |  | 91.0 |  |  | 789.1 |  |  | 91.9 |
Foreign government bonds |  | 1.5 |  |  | — |  |  | 20.6 |  |  | 1.0 |  |  | 22.1 |  |  | 1.0 |
Corporate bonds |  | 195.0 |  |  | 25.4 |  |  | 1,171.3 |  |  | 194.9 |  |  | 1,366.3 |  |  | 220.3 |
Other asset-backed securities |  | 133.4 |  |  | 0.8 |  |  | 752.5 |  |  | 39.1 |  |  | 885.9 |  |  | 39.9 |
Total |  | $ | 479.2 |  |  | $ | 28.3 |  |  | $ | 3,415.5 |  |  | $ | 452.2 |  |  | $ | 3,894.7 |  |  | $ | 480.5 |
Number of positions with a gross unrealized loss |  | 195 |  |  |  |  | 2,305 |  |  |  |  | 2,500 |  |  |
Fair value as a percentage of total fixed maturities securities fair value |  | 9.2 | % |  |  |  | 65.2 | % |  |  |  | 74.4 | % |  |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 458.3 |  |  | $ | 54.4 |  |  | $ | 52.6 |  |  | $ | 14.7 |  |  | $ | 510.9 |  |  | $ | 69.1 |
Other |  | 242.7 |  |  | 34.1 |  |  | 65.8 |  |  | 33.7 |  |  | 308.5 |  |  | 67.8 |
Municipal bonds |  | 911.6 |  |  | 113.7 |  |  | 42.2 |  |  | 14.4 |  |  | 953.8 |  |  | 128.1 |
Foreign government bonds |  | 32.7 |  |  | 1.4 |  |  | 0.4 |  |  | 0.2 |  |  | 33.1 |  |  | 1.6 |
Corporate bonds |  | 1,345.0 |  |  | 221.1 |  |  | 148.9 |  |  | 51.1 |  |  | 1,493.9 |  |  | 272.2 |
Other asset-backed securities |  | 543.4 |  |  | 37.1 |  |  | 424.3 |  |  | 31.0 |  |  | 967.7 |  |  | 68.1 |
Total |  | $ | 3,533.7 |  |  | $ | 461.8 |  |  | $ | 734.2 |  |  | $ | 145.1 |  |  | $ | 4,267.9 |  |  | $ | 606.9 |
Number of positions with a gross unrealized loss |  | 2,515 |  |  |  |  | 587 |  |  |  |  | 3,102 |  |  |
Fair value as a percentage of total fixed maturities securities fair value |  | 68.2 | % |  |  |  | 14.2 | % |  |  |  | 82.4 | % |  |
Schedule of Distribution of the Company's Fixed Maturity Portfolio by Estimated Expected Maturity | With regards to fixed maturity securities that had gross unrealized losses more than 12 months, the number of positions by their respective credit ratings was as follows:
|  | Number of Positions
|  | December 31,
|  | 2023 |  | 2022
Credit Rating |  |  |  |
AAA |  | 226 |  |  | 67 |
AA |  | 1,006 |  |  | 217 |
A |  | 423 |  |  | 94 |
BBB |  | 448 |  |  | 93 |
Total investment grade |  | 2,103 |  |  | 471 |
BB |  | 93 |  |  | 68 |
B |  | 39 |  |  | 31 |
CCC or lower |  | 7 |  |  | 2 |
Total below investment grade |  | 139 |  |  | 101 |
Not rated |  | 63 |  |  | 15 |
Totals: |  | 2,305 |  |  | 587 |
The following table presents the distribution of the Company's fixed maturity securities portfolio by estimated expected maturity. Estimated expected maturities differ from contractual maturities, reflecting assumptions regarding borrowers' utilization of the right to call or prepay obligations with or without call or prepayment penalties. For structured securities, estimated expected maturities consider broker-dealer survey prepayment assumptions and are verified for consistency with the interest rate and economic environments.
($ in millions) |  | December 31, 2023
|  | Amortized Cost, net |  | Fair Value |  | Percent of Total Fair Value
Estimated expected maturity: |  |  |  |  |  |
Due in 1 year or less |  | $ | 298.6 |  |  | $ | 294.1 |  |  | 5.6 | %
Due after 1 year through 5 years |  | 1,482.4 |  |  | 1,435.5 |  |  | 27.4 | %
Due after 5 years through 10 years |  | 1,435.1 |  |  | 1,371.5 |  |  | 26.2 | %
Due after 10 years through 20 years |  | 1,426.3 |  |  | 1,282.6 |  |  | 24.5 | %
Due after 20 years |  | 1,010.5 |  |  | 851.6 |  |  | 16.3 | %
Total |  | $ | 5,652.9 |  |  | $ | 5,235.3 |  |  | 100.0 | %
Schedule of Proceeds Received From Sales of Fixed Maturities and Equity Securities | Proceeds received from sales of fixed maturity and equity securities, each determined using the specific identification method, and gross gains and gross losses realized as a result of those sales for each year were as follows:
($ in millions) |  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Fixed maturity securities |  |  |  |  |  |
Proceeds received |  | $ | 377.6 |  |  | $ | 752.0 |  |  | $ | 578.2 |
Gross gains realized |  | 2.2 |  |  | 5.5 |  |  | 10.5 |
Gross losses realized |  | (14.0) |  |  | (23.7) |  |  | (7.7) |
Equity securities |  |  |  |  |  |
Proceeds received |  | $ | 18.7 |  |  | $ | 10.8 |  |  | $ | 4.7 |
Gross gains realized |  | — |  |  | 1.7 |  |  | 1.5 |
Gross losses realized |  | (11.8) |  |  | (1.0) |  |  | (0.1) |
Schedule of Reconciliation of Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities and Equity Securities | The following table reconciles the net unrealized investment gains (losses) on fixed maturity securities, net of tax, included in AOCI:
($ in millions) |  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |  |  |
Beginning of period |  | $ | (449.6) |  |  | $ | 347.1 |  |  | $ | 366.3 |
Effect of adopting ASU 2018-12 |  | — |  |  | — |  |  | 71.1 |
Change in net unrealized investment gains (losses) on fixed maturity securities |  | 105.3 |  |  | (819.7) |  |  | (96.4) |
Reclassification of net investment (gains) losses on fixed maturity securities to net income |  | 16.0 |  |  | 23.0 |  |  | 6.1 |
End of period |  | $ | (328.3) |  |  | $ | (449.6) |  |  | $ | 347.1 |
Schedule of Carrying Amounts of Equity Method Limited Partnership Interests | The carrying amounts of EMA limited partnership interests were as follows:
($ in millions) |  | December 31,
|  | 2023 |  | 2022
Commercial mortgage loan funds |  | $ | 660.8 |  |  | $ | 593.6 |
Real estate equity funds |  | 109.2 |  |  | 71.3 |
Private equity funds |  | 92.7 |  |  | 76.3 |
Infrastructure equity funds |  | 77.2 |  |  | 72.0 |
Infrastructure debt funds |  | 59.1 |  |  | 60.0 |
Other funds(1) |  | 139.8 |  |  | 110.5 |
Total |  | $ | 1,138.8 |  |  | $ | 983.7 |
(1) Other funds consist primarily of limited partnership interests in corporate mezzanine, venture capital, and private credit funds.
Schedule of Offsetting Assets and Liability | The following table presents instruments that were subject to a master netting arrangement for the Company.
($ in millions) |  |  |  | Gross Amounts Offset in the Consolidated Balance Sheets |  | Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheets |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
|  | Gross Amounts |  |  |  | Financial Instruments |  | Cash Collateral Received |  | Net Amount
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Asset derivatives |  |  |  |  |  |  |  |  |  |  |  |
Free-standing derivatives |  | $ | 19.0 |  |  | $ | — |  |  | $ | 19.0 |  |  | $ | — |  |  | $ | 18.5 |  |  | $ | 0.5 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Asset derivatives |  |  |  |  |  |  |  |  |  |  |  |
Free-standing derivatives |  | $ | 6.8 |  |  | $ | — |  |  | $ | 6.8 |  |  | $ | — |  |  | $ | 5.9 |  |  | $ | 0.9 |

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