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Investments (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Components of Net Investment | The components of net investment income for the following periods were as follows:
($ in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Fixed maturity securities |  | $ | 72.0 |  |  | $ | 65.2 |  |  | $ | 142.4 |  |  | $ | 132.9 |
Equity securities |  | 1.4 |  |  | 0.7 |  |  | 2.6 |  |  | 3.4 |
Limited partnership interests |  | 8.2 |  |  | 15.7 |  |  | 14.4 |  |  | 20.1 |
Short-term and other investments |  | 4.3 |  |  | 3.5 |  |  | 9.0 |  |  | 7.0 |
Investment expenses |  | (3.2) |  |  | (2.6) |  |  | (5.8) |  |  | (6.2) |
Net investment income - investment portfolio |  | 82.7 |  |  | 82.5 |  |  | 162.6 |  |  | 157.2 |
Investment income - deposit asset on reinsurance |  | 25.7 |  |  | 26.0 |  |  | 51.2 |  |  | 51.7 |
Total net investment income |  | $ | 108.4 |  |  | $ | 108.5 |  |  | $ | 213.8 |  |  | $ | 208.9 |
Schedule of Net Investment Gains (Losses) | Net investment gains (losses) for the following periods were as follows:
($ in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Fixed maturity securities |  | $ | (2.3) |  |  | $ | (14.7) |  |  | $ | (3.3) |  |  | $ | (17.1) |
Equity securities |  | (2.1) |  |  | (3.5) |  |  | 0.5 |  |  | (4.5) |
Short-term investments and other |  | (1.5) |  |  | 0.8 |  |  | (0.9) |  |  | 0.3 |
Net investment gains (losses) |  | $ | (5.9) |  |  | $ | (17.4) |  |  | $ | (3.7) |  |  | $ | (21.3) |
The breakdown of net investment gains (losses) by transaction type for the following periods were as follows:
($ in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Credit loss impairments |  | $ | 0.9 |  |  | $ | (0.5) |  |  | $ | — |  |  | $ | (0.5) |
Intent-to-sell impairments |  | — |  |  | (6.1) |  |  | — |  |  | (6.1) |
Total impairments |  | 0.9 |  |  | (6.6) |  |  | — |  |  | (6.6) |
Sales and other, net |  | (3.2) |  |  | (19.3) |  |  | (3.3) |  |  | (21.7) |
Change in fair value - equity securities |  | (2.1) |  |  | 7.7 |  |  | 0.5 |  |  | 6.7 |
Change in fair value and gains (losses) realized on settlements - derivatives |  | (1.5) |  |  | 0.8 |  |  | (0.9) |  |  | 0.3 |
Net investment gains (losses) |  | $ | (5.9) |  |  | $ | (17.4) |  |  | $ | (3.7) |  |  | $ | (21.3) |
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) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Beginning balance |  | $ | 2.1 |  |  | $ | 1.2 |  |  | $ | 1.2 |  |  | $ | 1.2 |
Credit losses on fixed maturity securities for which credit losses were not previously reported |  | 0.8 |  |  | 0.5 |  |  | 1.7 |  |  | 0.5 |
Net increase related to credit losses previously reported |  | (0.9) |  |  | — |  |  | (0.9) |  |  | — |
Reduction of credit allowances related to sales |  | (0.9) |  |  | — |  |  | (0.9) |  |  | — |
Write-offs |  | — |  |  | (0.5) |  |  | — |  |  | (0.5) |
Ending balance |  | $ | 1.1 |  |  | $ | 1.2 |  |  | $ | 1.1 |  |  | $ | 1.2 |
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
June 30, 2024 |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations: |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 742.0 |  |  | $ | 2.6 |  |  | $ | 75.4 |  |  | $ | 669.2 |
Other, including U.S. Treasury securities |  | 441.3 |  |  | 0.1 |  |  | 67.9 |  |  | 373.5 |
Municipal bonds |  | 1,259.3 |  |  | 19.5 |  |  | 102.1 |  |  | 1,176.7 |
Foreign government bonds |  | 23.1 |  |  | — |  |  | 1.1 |  |  | 22.0 |
Corporate bonds |  | 2,073.4 |  |  | 14.9 |  |  | 242.1 |  |  | 1,846.2 |
Other asset-backed securities |  | 1,277.4 |  |  | 11.1 |  |  | 30.7 |  |  | 1,257.8 |
Totals |  | $ | 5,816.5 |  |  | $ | 48.2 |  |  | $ | 519.3 |  |  | $ | 5,345.4 |
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 |
Schedule of Fair Value and Gross Unrealized Losses of Fixed Maturity Securities and Equity Securities in an Unrealized Loss Position |
($ 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
June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 81.7 |  |  | $ | 0.8 |  |  | $ | 475.2 |  |  | $ | 74.6 |  |  | $ | 556.9 |  |  | $ | 75.4 |
Other |  | 62.5 |  |  | 0.6 |  |  | 302.0 |  |  | 67.4 |  |  | 364.5 |  |  | 68.0 |
Municipal bonds |  | 140.9 |  |  | 1.7 |  |  | 700.9 |  |  | 100.3 |  |  | 841.8 |  |  | 102.0 |
Foreign government bonds |  | — |  |  | — |  |  | 22.0 |  |  | 1.1 |  |  | 22.0 |  |  | 1.1 |
Corporate bonds |  | 348.4 |  |  | 21.8 |  |  | 1,114.1 |  |  | 220.3 |  |  | 1,462.5 |  |  | 242.1 |
Other asset-backed securities |  | 134.0 |  |  | 0.4 |  |  | 474.8 |  |  | 30.3 |  |  | 608.8 |  |  | 30.7 |
Total |  | $ | 767.5 |  |  | $ | 25.3 |  |  | $ | 3,089.0 |  |  | $ | 494.0 |  |  | $ | 3,856.5 |  |  | $ | 519.3 |
Number of positions with a gross unrealized loss |  | 438 |  |  |  |  | 2,161 |  |  |  |  | 2,599 |  |  |
Fair value as a percentage of total fixed maturity securities at fair value |  | 14.4 | % |  |  |  | 57.8 | % |  |  |  | 72.2 | % |  |
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 maturity securities at fair value |  | 9.2 | % |  |  |  | 65.2 | % |  |  |  | 74.4 | % |  |
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 were as follows:
|  | Number of Positions
|  | June 30, 2024 |  | December 31, 2023
Credit Rating |  |  |  |
AAA |  | 185 |  |  | 226 |
AA |  | 983 |  |  | 1,006 |
A |  | 397 |  |  | 423 |
BBB |  | 419 |  |  | 448 |
Total investment grade |  | 1,984 |  |  | 2,103 |
BB |  | 75 |  |  | 93 |
B |  | 36 |  |  | 39 |
CCC or lower |  | 4 |  |  | 7 |
Total below investment grade |  | 115 |  |  | 139 |
Not rated |  | 62 |  |  | 63 |
Totals: |  | 2,161 |  |  | 2,305 |
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) |  | June 30, 2024
|  | Amortized Cost, net |  | Fair Value |  | Percent of Total Fair Value
Estimated expected maturity: |  |  |  |  |  |
Due in 1 year or less |  | $ | 296.6 |  |  | $ | 292.4 |  |  | 5.5 | %
Due after 1 year through 5 years |  | 1,497.3 |  |  | 1,451.5 |  |  | 27.1 | %
Due after 5 years through 10 years |  | 1,524.5 |  |  | 1,449.0 |  |  | 27.1 | %
Due after 10 years through 20 years |  | 1,452.8 |  |  | 1,289.1 |  |  | 24.1 | %
Due after 20 years |  | 1,045.3 |  |  | 863.4 |  |  | 16.2 | %
Total |  | $ | 5,816.5 |  |  | $ | 5,345.4 |  |  | 100.0 | %
Average option-adjusted duration, in years |  | 5.8 |  |  |  |
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 period were as follows:
($ in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Fixed maturity securities |  |  |  |  |  |  |  |
Proceeds received |  | $ | 105.1 |  |  | $ | 143.5 |  |  | $ | 193.0 |  |  | $ | 206.2 |
Gross gains realized |  | 0.7 |  |  | 0.3 |  |  | 2.0 |  |  | 0.6 |
Gross losses realized |  | (3.9) |  |  | (8.4) |  |  | (5.3) |  |  | (11.1) |
Equity securities |  |  |  |  |  |  |  |
Proceeds received |  | $ | — |  |  | $ | 9.8 |  |  | $ | — |  |  | $ | 9.8 |
Gross gains realized |  | — |  |  | — |  |  | — |  |  | — |
Gross losses realized |  | — |  |  | (11.3) |  |  | — |  |  | (11.3) |
Schedule of Reconciliation of Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities and Equity Securities | The following table reconciles net unrealized investment gains (losses) on fixed maturity securities, net of tax, included in AOCI:
($ in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2024 |  | 2023 |  | 2024 |  | 2023
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |  |  |  |  |
Beginning of period |  | $ | (348.0) |  |  | $ | (356.4) |  |  | $ | (328.3) |  |  | $ | (449.6) |
Change in net unrealized investment gains (losses) on fixed maturity securities |  | (24.1) |  |  | (48.9) |  |  | (44.6) |  |  | 42.4 |
Reclassification of net investment losses on fixed maturity securities to net income |  | 1.7 |  |  | 11.6 |  |  | 2.5 |  |  | 13.5 |
End of period |  | $ | (370.4) |  |  | $ | (393.7) |  |  | $ | (370.4) |  |  | $ | (393.7) |
Schedule of Carrying Amounts of Equity Method Limited Partnership Interests | The carrying amounts of EMA limited partnership interests were as follows:
($ in millions) |  |  |  |
|  | June 30, 2024 |  | December 31, 2023
Commercial mortgage loan funds |  | $ | 626.9 |  |  | $ | 660.8 |
Real estate equity funds |  | 102.9 |  |  | 109.2 |
Private equity funds |  | 99.8 |  |  | 92.7 |
Infrastructure equity funds |  | 79.4 |  |  | 77.2 |
Infrastructure debt funds |  | 64.4 |  |  | 59.1 |
Other funds(1) |  | 138.3 |  |  | 139.8 |
Total |  | $ | 1,111.7 |  |  | $ | 1,138.8 |
(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
June 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Asset derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Free-standing derivatives |  | $ | 19.4 |  |  | $ | — |  |  | $ | 19.4 |  |  | $ | — |  |  | $ | 20.2 |  |  | $ | (0.8) |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Asset derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Free-standing derivatives |  | $ | 19.0 |  |  | $ | — |  |  | $ | 19.0 |  |  | $ | — |  |  | $ | 18.5 |  |  | $ | 0.5 |

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