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Investments (Tables) | 12 Months Ended
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Dec. 31, 2022
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,
|  | 2022 |  | 2021 |  | 2020
Fixed maturity securities |  | $ | 247.2 |  |  | $ | 235.6 |  |  | $ | 232.9 |
Equity securities |  | 9.0 |  |  | 5.3 |  |  | 4.7 |
Limited partnership interests |  | 40.5 |  |  | 79.0 |  |  | 20.9 |
Short-term and other investments |  | 11.2 |  |  | 11.6 |  |  | 11.4 |
Investment expenses |  | (10.5) |  |  | (10.1) |  |  | (9.6) |
Net investment income - investment portfolio |  | 297.4 |  |  | 321.4 |  |  | 260.3 |
Investment income - deposit asset on reinsurance |  | 103.5 |  |  | 101.1 |  |  | 97.3 |
Total net investment income |  | $ | 400.9 |  |  | $ | 422.5 |  |  | $ | 357.6 |
Schedule of Net Investment Losses | Net investment losses for the following periods were as follows:
($ in millions) |  | Year Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Fixed maturity securities |  | $ | (29.1) |  |  | $ | (7.7) |  |  | $ | 9.4 |
Equity securities |  | (32.6) |  |  | (0.8) |  |  | 1.8 |
Short-term investments and other |  | 5.2 |  |  | (2.5) |  |  | (13.5) |
Net investment losses |  | $ | (56.5) |  |  | $ | (11.0) |  |  | $ | (2.3) |
The following table reconciles net investment gains (losses) by transaction type:
($ in millions) |  | Year Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Credit loss impairments |  | $ | (3.1) |  |  | $ | (8.1) |  |  | $ | — |
Intent-to-sell impairments |  | (7.6) |  |  | (2.3) |  |  | (5.3) |
Total impairments |  | (10.7) |  |  | (10.4) |  |  | (5.3) |
Sales and other, net |  | (17.8) |  |  | 4.3 |  |  | 15.0 |
Change in fair value - equity securities |  | (33.2) |  |  | (2.3) |  |  | (0.2) |
Change in fair value and losses realized on settlements - derivatives |  | 5.2 |  |  | (2.6) |  |  | (11.8) |
Net investment losses |  | $ | (56.5) |  |  | $ | (11.0) |  |  | $ | (2.3) |
Schedule of Financing Receivable, Allowance for Credit Loss | 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,
|  | 2022 |  | 2021 |  | 2020
Beginning balance |  | $ | 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 |  |  | $ | 7.7 |  |  | $ | — |
Schedule of Unrealized Gains and Losses on Fixed Maturities and Equity Securities | 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, 2022 |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations:(1) |  |  |  |  |  |  |  |
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 |
December 31, 2021 |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations:(1) |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 612.1 |  |  | $ | 51.9 |  |  | $ | 1.5 |  |  | $ | 662.5 |
Other, including U.S. Treasury securities |  | 342.5 |  |  | 27.7 |  |  | 4.3 |  |  | 365.9 |
Municipal bonds |  | 1,519.7 |  |  | 184.4 |  |  | 0.7 |  |  | 1,703.4 |
Foreign government bonds |  | 40.2 |  |  | 3.4 |  |  | — |  |  | 43.6 |
Corporate bonds |  | 2,217.7 |  |  | 176.2 |  |  | 5.2 |  |  | 2,388.7 |
Other asset-backed securities |  | 1,065.5 |  |  | 16.6 |  |  | 6.9 |  |  | 1,075.2 |
Totals |  | $ | 5,797.7 |  |  | $ | 460.2 |  |  | $ | 18.6 |  |  | $ | 6,239.3 |
(1) Fair value includes securities issued by Federal National Mortgage Association (FNMA) of $330.8 million and $376.7 million; Federal Home Loan Mortgage Corporation (FHLMC) of $273.3 million and $326.5 million; and Government National Mortgage Association (GNMA) of $86.2 million and $112.1 million as of December 31, 2022 and 2021, respectively.
Summary 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, 2022 and 2021. The Company views the decrease in fair value of all fixed maturity securities with unrealized losses as of December 31, 2022 — which was driven largely by increasing interest rates, spread widening, financial market illiquidity and/or market volatility from the date of acquisition — as temporary. As of December 31, 2022, the Company has not made the decision to sell and it is not more likely than not the Company will be required to sell the fixed maturity securities with unrealized losses before anticipated recovery in value. There has been a significant increase in interest rates since December 31, 2021, driven mostly by increases in U.S. Treasury rates, though credit spreads also widened. The 10-year U.S. Treasury yield increased 236 basis points for the year ended December 31, 2022, rising from 1.51% as of December 31, 2021 to 3.87% as of December 31, 2022. Additionally, credit spreads widened during the same time period, with investment grade and high yield wider by 40 and 171 basis points, respectively. These upward movements in rates caused market yields in the Company's portfolios to rise sharply, with downward pressure on prices. Investment grade and high yield total returns for the year ended December 31, 2022 were down 15.4% and 11.2%, respectively. The Bloomberg Barclays Index Yield-to-Worst for Investment Grade rose 3.1% for the year ended December 31, 2022, ending at 5.4%, while the High Yield Index rose 4.8% to 9.0%. The Company's portfolios generated sizable unrealized losses as a result of sharp increases in interest rates. Therefore, it was determined that the unrealized losses on the fixed maturity securities presented in the table below were not indicative of any credit loss impairments as of December 31, 2022.
($ 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, 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 | % |  |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and federally sponsored agency obligations: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 67.4 |  |  | $ | 1.3 |  |  | $ | 3.9 |  |  | $ | 0.2 |  |  | $ | 71.3 |  |  | $ | 1.5 |
Other |  | 59.5 |  |  | 1.7 |  |  | 35.1 |  |  | 2.6 |  |  | 94.6 |  |  | 4.3 |
Municipal bonds |  | 56.8 |  |  | 0.7 |  |  | 0.6 |  |  | — |  |  | 57.4 |  |  | 0.7 |
Foreign government bonds |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Corporate bonds |  | 220.7 |  |  | 3.8 |  |  | 44.1 |  |  | 1.4 |  |  | 264.8 |  |  | 5.2 |
Other asset-backed securities |  | 379.0 |  |  | 3.8 |  |  | 128.2 |  |  | 3.1 |  |  | 507.2 |  |  | 6.9 |
Total |  | $ | 783.4 |  |  | $ | 11.3 |  |  | $ | 211.9 |  |  | $ | 7.3 |  |  | $ | 995.3 |  |  | $ | 18.6 |
Number of positions with a gross unrealized loss |  | 516 |  |  |  |  | 122 |  |  |  |  | 638 |  |  |
Fair value as a percentage of total fixed maturities securities fair value |  | 12.6 | % |  |  |  | 3.4 | % |  |  |  | 16.0 | % |  |
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,
|  | 2022 |  | 2021
Credit Rating |  |  |  |
AAA |  | 67 |  |  | 24 |
AA |  | 217 |  |  | 38 |
A |  | 94 |  |  | 3 |
BBB |  | 93 |  |  | 14 |
BB |  | 68 |  |  | 13 |
B |  | 31 |  |  | 8 |
CCC or lower |  | 2 |  |  | — |
Not rated |  | 15 |  |  | 22 |
Totals: |  | 587 |  |  | 122 |
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, 2022
|  | Amortized Cost, net |  | Fair Value |  | Percent of Total Fair Value
Estimated expected maturity: |  |  |  |  |  |
Due in 1 year or less |  | $ | 235.4 |  |  | $ | 226.7 |  |  | 4.4 | %
Due after 1 year through 5 years |  | 1,423.3 |  |  | 1,362.4 |  |  | 26.3 | %
Due after 5 years through 10 years |  | 1,558.5 |  |  | 1,448.0 |  |  | 27.9 | %
Due after 10 years through 20 years |  | 1,477.9 |  |  | 1,296.2 |  |  | 25.0 | %
Due after 20 years |  | 1,061.8 |  |  | 851.7 |  |  | 16.4 | %
Total |  | $ | 5,756.9 |  |  | $ | 5,185.0 |  |  | 100.0 | %
Average option-adjusted duration, in years |  | 6.4 |  |  |  |
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,
|  | 2022 |  | 2021 |  | 2020
Fixed maturity securities |  |  |  |  |  |
Proceeds received |  | $ | 752.0 |  |  | $ | 578.2 |  |  | $ | 472.9 |
Gross gains realized |  | 5.5 |  |  | 10.5 |  |  | 20.5 |
Gross losses realized |  | (23.7) |  |  | (7.7) |  |  | (6.1) |
Equity securities |  |  |  |  |  |
Proceeds received |  | $ | 10.8 |  |  | $ | 4.7 |  |  | $ | 12.7 |
Gross gains realized |  | 1.7 |  |  | 1.5 |  |  | 2.2 |
Gross losses realized |  | (1.0) |  |  | (0.1) |  |  | (1.9) |
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, before the impact on DAC:
($ in millions) |  | Year Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |  |  |
Beginning of period |  | $ | 348.9 |  |  | $ | 439.8 |  |  | $ | 264.4 |
Change in net unrealized investment gains (losses) on fixed maturity securities |  | (849.4) |  |  | (97.6) |  |  | 184.2 |
Reclassification of net investment (gains) losses on fixed maturity securities to net income |  | 48.7 |  |  | 6.7 |  |  | (8.8) |
End of period |  | $ | (451.8) |  |  | $ | 348.9 |  |  | $ | 439.8 |
Schedule of Equity Method Limited Partnership of Carrying Amount | The carrying amounts of equity method limited partnership interests were as follows:
($ in millions) |  | December 31,
|  | 2022 |  | 2021
Commercial mortgage loan funds |  | $ | 593.6 |  |  | $ | 346.8 |
Private equity funds |  | 76.3 |  |  | 74.0 |
Infrastructure equity funds |  | 72.0 |  |  | 58.3 |
Real estate equity funds |  | 71.3 |  |  | 46.3 |
Infrastructure debt funds |  | 60.0 |  |  | 62.4 |
Other funds(1) |  | 110.5 |  |  | 125.0 |
Total |  | $ | 983.7 |  |  | $ | 712.8 |
(1) Other funds consist primarily of limited partnership interests in corporate mezzanine, venture capital, and private credit funds. Investment in Entities Exceeding 10% of Shareholders' Equity
Schedule of Offsetting Assets and Liability | The following table presents the 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, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Asset derivatives |  |  |  |  |  |  |  |  |  |  |  |
Free-standing derivatives |  | $ | 6.8 |  |  | $ | — |  |  | $ | 6.8 |  |  | $ | — |  |  | $ | 5.9 |  |  | $ | 0.9 |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Asset derivatives |  |  |  |  |  |  |  |  |  |  |  |
Free-standing derivatives |  | $ | 10.7 |  |  | $ | — |  |  | $ | 10.7 |  |  | $ | 4.5 |  |  | $ | 6.4 |  |  | $ | (0.2) |

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