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Investments (Tables) | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Investment Income | The following table summarizes investment income for the twelve months ended December 31, 2023, 2022 and 2021:
| For the Twelve Months Ended
| December 31, 2023 |  | December 31, 2022 |  | December 31, 2021
| ($ in millions)
Fixed income securities — Available for sale | $ | 115.7 |  |  | $ | 95.6 |  |  | $ | 87.2 |
Fixed income securities — Trading | 98.9 |  |  | 57.0 |  |  | 30.2 |
Short-term investments — Available for sale | 5.3 |  |  | 0.6 |  |  | 0.1 |
Short-term investments — Trading | 0.3 |  |  | 0.1 |  |  | — |
Fixed term deposits (included in cash and cash equivalents) | 39.9 |  |  | 6.6 |  |  | 0.7 |
Catastrophe bonds — Trading | 0.2 |  |  | 0.3 |  |  | 0.9 |
Privately-held investments — Available for sale | 0.1 |  |  | — |  |  | — |
Privately-held investments — Trading | 44.7 |  |  | 24.3 |  |  | 18.2 |
Other investments, at fair value (1) | (17.8) |  |  | 13.9 |  |  | 21.9 |
Total | 287.3 |  |  | 198.4 |  |  | 159.2 |
Investment expenses | (11.6) |  |  | (10.3) |  |  | (11.7) |
Net investment income | $ | 275.7 |  |  | $ | 188.1 |  |  | $ | 147.5 |
________________ (1)Other investments primarily represent the Company’s investments in investment funds. The amount reported represents the change in fair value of the investments in the period. The following table summarizes investment income for the three and nine months ended September 30, 2024 and 2023:
| For the Three Months Ended |  | For the Nine Months Ended
| September 30, 2024 |  | September 30, 2023 |  | September 30, 2024 |  | September 30, 2023
| ($ in millions) |  | ($ in millions)
Fixed income securities, available for sale | $ | 40.7 |  |  | $ | 28.8 |  |  | $ | 117.0 |  |  | $ | 84.5 |
Fixed income securities, trading | 21.5 |  |  | 25.6 |  |  | 69.3 |  |  | 73.4 |
Short-term investments, available for sale | 0.7 |  |  | 2.2 |  |  | 2.5 |  |  | 3.8 |
Short-term investments, trading | — |  |  | 0.2 |  |  | 0.1 |  |  | 0.3 |
Fixed term deposits (included in cash and cash equivalents) | 12.1 |  |  | 9.8 |  |  | 33.2 |  |  | 27.1 |
Catastrophe bonds, trading | — |  |  | 0.3 |  |  | — |  |  | 1.4 |
Privately-held investments, available for sale | 0.3 |  |  | — |  |  | 0.7 |  |  | — |
Privately-held investments, trading | 8.7 |  |  | 11.4 |  |  | 29.7 |  |  | 32.9 |
Other investments, at fair value (1) | (2.3) |  |  | 0.7 |  |  | (4.4) |  |  | (9.7) |
Total | 81.7 |  |  | 79.0 |  |  | 248.1 |  |  | 213.7 |
Investment expenses | (2.1) |  |  | (1.1) |  |  | (9.2) |  |  | (6.4) |
Net investment income | $ | 79.6 |  |  | $ | 77.9 |  |  | $ | 238.9 |  |  | $ | 207.3 |
________________ (1)Other investments primarily represent the Company’s investments in investment funds. The amount reported represents the change in fair value of the investments in the period.
Net Realized and Unrealized Investment Gains and Losses and Change in Unrealized Gains and Losses on Investments | The following table summarizes the net realized and unrealized investment gains and losses recorded in the consolidated statement of operations and the change in unrealized gains and losses on investments recorded in other comprehensive income for the twelve months ended December 31, 2023, 2022 and 2021:
| For the Twelve Months Ended
| December 31, 2023 |  | December 31, 2022 |  | December 31, 2021
| ($ in millions)
Available for sale: |  |  |  |  |
Fixed income securities — gross realized gains | $ | 1.6 |  |  | $ | 2.9 |  |  | $ | 22.7 |
Fixed income securities — gross realized (losses) | (41.5) |  |  | (58.4) |  |  | (3.6) |
Short-term investments — gross realized gains | 0.6 |  |  | 1.0 |  |  | 2.0 |
Short-term investments — gross realized (losses) | (0.9) |  |  | (0.5) |  |  | (0.8) |
Net change in expected credit gains/(losses) | 4.8 |  |  | (5.0) |  |  | (2.5) |
Trading: |  |  |  |  |
Fixed income securities — gross realized gains | 1.0 |  |  | 0.2 |  |  | 12.2 |
Fixed income securities — gross realized (losses) | (3.5) |  |  | (1.8) |  |  | (2.0) |
Short-term investments — gross realized gains | 0.1 |  |  | — |  |  | 0.1 |
Short-term investments — gross realized (losses) | (0.3) |  |  | — |  |  | (0.3) |
Privately-held investments — gross realized gains | 0.8 |  |  | 0.7 |  |  | 0.6 |
Privately-held investments — gross realized (losses) | — |  |  | (0.1) |  |  | (13.8) |
Privately-held investments — net unrealized (losses)/gains | (15.2) |  |  | (2.5) |  |  | 18.1 |
Catastrophe bonds — net unrealized gains/(losses) | 0.1 |  |  | 0.2 |  |  | (0.8) |
Fixed income securities — net unrealized gains/(losses) | 65.9 |  |  | (113.9) |  |  | (23.4) |
Investments — equity method: |  |  |  |  |
Gross realized and unrealized gains in MVI | 0.2 |  |  | — |  |  | 0.1 |
Gross unrealized gains/(losses) in Multi-Line Reinsurer | 0.8 |  |  | (0.4) |  |  | 0.2 |
Total net realized and unrealized investment gains/(losses) recorded in the consolidated statement of operations | $ | 14.5 |  |  | $ | (177.6) |  |  | $ | 8.8 |
Change in available for sale net unrealized gains/(losses): |  |  |  |  |
Available for sale investments | $ | 126.2 |  |  | $ | (391.7) |  |  | $ | (157.6) |
Income tax (expense)/benefit | (20.6) |  |  | 23.9 |  |  | (0.3) |
Total change in net unrealized gains/(losses), net of taxes recorded in other comprehensive income | $ | 105.6 |  |  | $ | (367.8) |  |  | $ | (157.9) |
The following table summarizes the net realized and unrealized investment gains and losses recorded in the consolidated statement of operations and the change in unrealized gains and losses on investments recorded in other comprehensive income for the three and nine months ended September 30, 2024 and 2023:
| For the Three Months Ended |  | For the Nine Months Ended
| September 30, 2024 |  | September 30, 2023 |  | September 30, 2024 |  | September 30, 2023
| ($ in millions) |  | ($ in millions)
Available for sale: |  |  |  |  |  |  |
Fixed income securities — gross realized gains | $ | 1.0 |  |  | $ | — |  |  | $ | 1.4 |  |  | $ | 0.4 |
Fixed income securities — gross realized (losses) | (10.9) |  |  | (8.6) |  |  | (36.1) |  |  | (15.6) |
Short-term investments — gross realized gains | 0.5 |  |  | — |  |  | 0.7 |  |  | 0.1 |
Short-term investments — gross realized (losses) | — |  |  | — |  |  | (1.4) |  |  | (0.3) |
Net change in expected credit gains | 0.5 |  |  | 0.3 |  |  | 0.9 |  |  | 4.0 |
Trading: |  |  |  |  |  |  |
Fixed income securities — gross realized gains | — |  |  | — |  |  | 1.0 |  |  | 0.3 |
Fixed income securities — gross realized (losses) | (0.2) |  |  | (0.5) |  |  | (9.5) |  |  | (1.5) |
Fixed income securities — net unrealized gains | 19.6 |  |  | 10.4 |  |  | 43.7 |  |  | 41.4 |
Short-term investments — gross realized gains | — |  |  | — |  |  | — |  |  | 0.1 |
Short-term investments — gross realized (losses) | — |  |  | — |  |  | (0.2) |  |  | (0.2) |
Privately-held investments — gross realized gains | 0.1 |  |  | 0.2 |  |  | 0.6 |  |  | 0.3 |
Privately-held investments — gross realized (losses) | (14.3) |  |  | — |  |  | (14.6) |  |  | — |
Privately-held investments — net unrealized gains/(losses) | 9.5 |  |  | (4.1) |  |  | (8.0) |  |  | (13.1) |
Catastrophe bonds — net unrealized gains/(losses) | — |  |  | 0.1 |  |  | — |  |  | (0.5) |
Investments, equity method: |  |  |  |  |  |  |
Net change in realized and unrealized gains in Multi-Line Reinsurer | 0.3 |  |  | 0.4 |  |  | 0.5 |  |  | 0.8 |
Total net realized and unrealized investment gains/(losses) recorded in the consolidated statement of operations | $ | 6.1 |  |  | $ | (1.8) |  |  | $ | (21.0) |  |  | $ | 16.2 |
Change in available for sale net unrealized gains/(losses): |  |  |  |  |  |  |
Available for sale investments | $ | 120.7 |  |  | $ | (45.0) |  |  | $ | 103.6 |  |  | $ | (32.7) |
Income tax (expense) | (15.1) |  |  | (0.2) |  |  | (13.1) |  |  | (1.8) |
Total change in net unrealized gains/(losses), net of taxes recorded in other comprehensive income | $ | 105.6 |  |  | $ | (45.2) |  |  | $ | 90.5 |  |  | $ | (34.5) |
Cost or Amortized Cost, Unrealized and Realized Gains and Losses and Estimated Fair Value of Available for Sale Investments | The following tables present the cost or amortized cost, gross unrealized gains and losses and estimated fair market value of available for sale investments in fixed income securities, short-term investments and privately-held investments as at December 31, 2023 and December 31, 2022:
| As at December 31, 2023
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses (1) |  | Fair Market Value
| ($ in millions)
Fixed Income Securities — Available for sale |  |  |  |  |  |  |  |  |
U.S. government | $ | 1,224.9 |  |  | $ | 4.4 |  |  | $ | (26.7) |  |  | $ | — |  |  | $ | 1,202.6 |
U.S. agency | 7.5 |  |  | — |  |  | (0.3) |  |  | — |  |  | 7.2 |
Municipal | 133.6 |  |  | — |  |  | (5.0) |  |  | (0.5) |  |  | 128.1 |
Corporate | 2,051.1 |  |  | 12.1 |  |  | (101.5) |  |  | (2.4) |  |  | 1,959.3 |
Non-U.S. government-backed corporate | 106.5 |  |  | 0.1 |  |  | (5.9) |  |  | — |  |  | 100.7 |
Non-U.S. government | 279.9 |  |  | 0.6 |  |  | (6.7) |  |  | — |  |  | 273.8 |
Agency commercial mortgage-backed | 6.6 |  |  | — |  |  | (0.8) |  |  | — |  |  | 5.8 |
Agency residential mortgage-backed | 519.9 |  |  | 0.1 |  |  | (74.9) |  |  | — |  |  | 445.1 |
Total fixed income securities — Available for sale | 4,330.0 |  |  | 17.3 |  |  | (221.8) |  |  | (2.9) |  |  | 4,122.6 |
Short-term investments — Available for sale | 93.6 |  |  | — |  |  | — |  |  | — |  |  | 93.6 |
Privately-held investments — Available for sale |  |  |  |  |  |  |  |  |
Asset-backed securities | 14.7 |  |  | 0.2 |  |  | — |  |  | — |  |  | 14.9 |
Total Investments — Available for sale | $ | 4,438.3 |  |  | $ | 17.5 |  |  | $ | (221.8) |  |  | $ | (2.9) |  |  | $ | 4,231.1 |
________________ (1)For more information on the allowance for expected credit losses, refer to Note 25, “Allowance for Expected Credit Losses”.
| As at December 31, 2022
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Fair Market Value
| ($ in millions)
Fixed Income Securities — Available for sale |  |  |  |  |  |  |  |  |
U.S. government | $ | 1,003.7 |  |  | $ | — |  |  | $ | (50.7) |  |  | $ | — |  |  | $ | 953.0 |
U.S. agency | 9.2 |  |  | — |  |  | (0.4) |  |  | — |  |  | 8.8 |
Municipal | 159.9 |  |  | — |  |  | (9.4) |  |  | (1.0) |  |  | 149.5 |
Corporate | 2,016.9 |  |  | 3.5 |  |  | (169.1) |  |  | (6.3) |  |  | 1,845.0 |
Non-U.S. government-backed corporate | 119.4 |  |  | — |  |  | (8.8) |  |  | (0.2) |  |  | 110.4 |
Non-U.S. government | 225.2 |  |  | 0.1 |  |  | (11.5) |  |  | (0.2) |  |  | 213.6 |
Non-agency commercial mortgage-backed | 6.6 |  |  | — |  |  | (1.0) |  |  | — |  |  | 5.6 |
Agency mortgage-backed | 590.4 |  |  | — |  |  | (87.7) |  |  | — |  |  | 502.7 |
Total fixed income securities — Available for sale | 4,131.3 |  |  | 3.6 |  |  | (338.6) |  |  | (7.7) |  |  | 3,788.6 |
Short-term investments — Available for sale | 52.4 |  |  | — |  |  | (0.4) |  |  | — |  |  | 52.0 |
Total Investments — Available for sale | $ | 4,183.7 |  |  | $ | 3.6 |  |  | $ | (339.0) |  |  | $ | (7.7) |  |  | $ | 3,840.6 |
The scheduled maturity distribution of the Company’s available for sale securities as at December 31, 2023 and December 31, 2022 is set forth below. Actual maturities may differ from contractual maturities because issuers of securities may have the right to call or prepay obligations with or without call or prepayment penalties.
| As at December 31, 2023
| Amortized Cost or Cost |  | Fair Market Value |  |
| ($ in millions)
Due one year or less | $ | 512.0 |  |  | $ | 505.8 |  |  |
Due after one year through five years | 2,889.0 |  |  | 2,818.9 |  |  |
Due after five years through ten years | 495.1 |  |  | 440.3 |  |  |
Due after ten years | 15.7 |  |  | 15.2 |  |  |
| 3,911.8 |  |  | 3,780.2 |  |  |
Agency commercial mortgage-backed | 6.6 |  |  | 5.8 |  |  |
Agency residential mortgage-backed | 519.9 |  |  | 445.1 |  |  |
Total Investments — Available for sale | $ | 4,438.3 |  |  | $ | 4,231.1 |  |  |
| At December 31, 2022
| Amortized Cost or Cost |  | Fair Market Value |  |
| ($ in millions)
Due one year or less | $ | 231.5 |  |  | $ | 228.0 |  |  |
Due after one year through five years | 2,526.9 |  |  | 2,385.7 |  |  |
Due after five years through ten years | 815.1 |  |  | 707.7 |  |  |
Due after ten years | 13.2 |  |  | 10.9 |  |  |
| 3,586.7 |  |  | 3,332.3 |  |  |
Non-agency commercial mortgage-backed | 6.6 |  |  | 5.6 |  |  |
Agency mortgage-backed | 590.4 |  |  | 502.7 |  |  |
Total Investments — Available for sale | $ | 4,183.7 |  |  | $ | 3,840.6 |  |  |
The following tables summarize, by type of security, the aggregate fair value and gross unrealized loss by length of time the security has been in an unrealized loss position for the Company’s available for sale portfolio as at December 31, 2023 and December 31, 2022:
| December 31, 2023
| 0-12 months |  | Over 12 months |  | Total
| Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Number of Securities
| ($ in millions)
U.S. government | $ | 105.5 |  |  | $ | (0.5) |  |  | $ | 673.3 |  |  | $ | (26.2) |  |  | $ | 778.8 |  |  | $ | (26.7) |  |  | 74
U.S. agency | — |  |  | — |  |  | 7.2 |  |  | (0.3) |  |  | 7.2 |  |  | (0.3) |  |  | 1
Municipal | 11.1 |  |  | (1.0) |  |  | 117.0 |  |  | (4.0) |  |  | 128.1 |  |  | (5.0) |  |  | 54
Corporate | 46.7 |  |  | (0.4) |  |  | 1,287.2 |  |  | (101.1) |  |  | 1,333.9 |  |  | (101.5) |  |  | 558
Non-U.S. government-backed corporate | 0.2 |  |  | — |  |  | 95.5 |  |  | (5.9) |  |  | 95.7 |  |  | (5.9) |  |  | 12
Non-U.S. government | 32.9 |  |  | (0.2) |  |  | 180.1 |  |  | (6.5) |  |  | 213.0 |  |  | (6.7) |  |  | 53
Agency commercial mortgage-backed | — |  |  | — |  |  | 5.8 |  |  | (0.8) |  |  | 5.8 |  |  | (0.8) |  |  | 1
Agency residential mortgage-backed | 0.1 |  |  | — |  |  | 435.9 |  |  | (74.9) |  |  | 436.0 |  |  | (74.9) |  |  | 197
Total | $ | 196.5 |  |  | $ | (2.1) |  |  | $ | 2,802.0 |  |  | $ | (219.7) |  |  | $ | 2,998.5 |  |  | $ | (221.8) |  |  | 950
| December 31, 2022
| 0-12 months |  | Over 12 months |  | Total
| Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Number of Securities
| ($ in millions)
U.S. government | $ | 741.1 |  |  | $ | (30.6) |  |  | $ | 203.4 |  |  | $ | (20.1) |  |  | $ | 944.5 |  |  | $ | (50.7) |  |  | 118
U.S. agency | 7.1 |  |  | (0.4) |  |  | 1.7 |  |  | — |  |  | 8.8 |  |  | (0.4) |  |  | 5
Municipal | 133.1 |  |  | (7.1) |  |  | 16.4 |  |  | (2.3) |  |  | 149.5 |  |  | (9.4) |  |  | 59
Corporate | 1,104.7 |  |  | (77.6) |  |  | 568.2 |  |  | (91.5) |  |  | 1,672.9 |  |  | (169.1) |  |  | 701
Non-U.S. government-backed corporate | 11.3 |  |  | (0.5) |  |  | 99.0 |  |  | (8.3) |  |  | 110.3 |  |  | (8.8) |  |  | 16
Non-U.S. government | 63.8 |  |  | (2.9) |  |  | 135.9 |  |  | (8.6) |  |  | 199.7 |  |  | (11.5) |  |  | 45
Non-agency commercial mortgage-backed securities | 5.6 |  |  | (1.0) |  |  | — |  |  | — |  |  | 5.6 |  |  | (1.0) |  |  | 1
Agency mortgage-backed | 202.8 |  |  | (24.9) |  |  | 299.1 |  |  | (62.8) |  |  | 501.9 |  |  | (87.7) |  |  | 220
Total fixed income securities — Available for sale | 2,269.5 |  |  | (145.0) |  |  | 1,323.7 |  |  | (193.6) |  |  | 3,593.2 |  |  | (338.6) |  |  | 1,165
Total short-term investments — Available for sale | 51.9 |  |  | (0.4) |  |  | — |  |  | — |  |  | 51.9 |  |  | (0.4) |  |  | 1
Total | $ | 2,321.4 |  |  | $ | (145.4) |  |  | $ | 1,323.7 |  |  | $ | (193.6) |  |  | $ | 3,645.1 |  |  | $ | (339.0) |  |  | 1,166
The following tables present the cost or amortized cost, gross unrealized gains and losses and estimated fair market value of available for sale investments in fixed income securities, short-term investments and privately-held investments as at September 30, 2024 and December 31, 2023:
| As at September 30, 2024
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Fair Market Value
| ($ in millions)
Fixed income securities, available for sale |  |  |  |  |  |  |  |  |
U.S. government | $ | 1,329.2 |  |  | $ | 11.0 |  |  | $ | (13.8) |  |  | $ | — |  |  | $ | 1,326.4 |
U.S. agency | 7.5 |  |  | — |  |  | (0.1) |  |  | — |  |  | 7.4 |
Municipal | 81.2 |  |  | 0.1 |  |  | (1.6) |  |  | (0.3) |  |  | 79.4 |
Corporate | 1,999.9 |  |  | 24.5 |  |  | (58.5) |  |  | (1.7) |  |  | 1,964.2 |
Non-U.S. government-backed corporate | 146.1 |  |  | 1.2 |  |  | (3.1) |  |  | — |  |  | 144.2 |
Non-U.S. government | 273.0 |  |  | 2.1 |  |  | (2.2) |  |  | — |  |  | 272.9 |
Asset-backed | 198.9 |  |  | 1.4 |  |  | (0.2) |  |  | — |  |  | 200.1 |
Agency commercial mortgage-backed | 5.0 |  |  | — |  |  | (0.5) |  |  | — |  |  | 4.5 |
Agency residential mortgage-backed | 616.6 |  |  | 3.6 |  |  | (63.5) |  |  | — |  |  | 556.7 |
Total fixed income securities, available for sale | 4,657.4 |  |  | 43.9 |  |  | (143.5) |  |  | (2.0) |  |  | 4,555.8 |
Short-term investments, available for sale | 66.5 |  |  | — |  |  | — |  |  | — |  |  | 66.5 |
Privately-held investments, available for sale |  |  |  |  |  |  |  |  |
Asset-backed securities | 25.1 |  |  | 0.2 |  |  | — |  |  | — |  |  | 25.3 |
Total investments, available for sale | $ | 4,749.0 |  |  | $ | 44.1 |  |  | $ | (143.5) |  |  | $ | (2.0) |  |  | $ | 4,647.6 |
| As at December 31, 2023
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Allowance for Credit Losses |  | Fair Market Value
| ($ in millions)
Fixed income securities, available for sale |  |  |  |  |  |  |  |  |
U.S. government | $ | 1,224.9 |  |  | $ | 4.4 |  |  | $ | (26.7) |  |  | $ | — |  |  | $ | 1,202.6 |
U.S. agency | 7.5 |  |  | — |  |  | (0.3) |  |  | — |  |  | 7.2 |
Municipal | 133.6 |  |  | — |  |  | (5.0) |  |  | (0.5) |  |  | 128.1 |
Corporate | 2,051.1 |  |  | 12.1 |  |  | (101.5) |  |  | (2.4) |  |  | 1,959.3 |
Non-U.S. government-backed corporate | 106.5 |  |  | 0.1 |  |  | (5.9) |  |  | — |  |  | 100.7 |
Non-U.S. government | 279.9 |  |  | 0.6 |  |  | (6.7) |  |  | — |  |  | 273.8 |
Agency commercial mortgage-backed | 6.6 |  |  | — |  |  | (0.8) |  |  | — |  |  | 5.8 |
Agency residential mortgage-backed | 519.9 |  |  | 0.1 |  |  | (74.9) |  |  | — |  |  | 445.1 |
Total fixed income securities, available for sale | 4,330.0 |  |  | 17.3 |  |  | (221.8) |  |  | (2.9) |  |  | 4,122.6 |
Short-term investments, available for sale | 93.6 |  |  | — |  |  | — |  |  | — |  |  | 93.6 |
Privately-held investments, available for sale |  |  |  |  |  |  |  |  |
Asset-backed securities | 14.7 |  |  | 0.2 |  |  | — |  |  | — |  |  | 14.9 |
Total investments, available for sale | $ | 4,438.3 |  |  | $ | 17.5 |  |  | $ | (221.8) |  |  | $ | (2.9) |  |  | $ | 4,231.1 |
The scheduled maturity distribution of the Company’s available for sale securities as at September 30, 2024 and December 31, 2023 is set forth below. Actual maturities may differ from contractual maturities because issuers of securities may have the right to call or prepay obligations with or without call or prepayment penalties.
| As at September 30, 2024
| Amortized Cost or Cost |  | Fair Market Value
| ($ in millions)
Due one year or less | $ | 773.6 |  |  | $ | 770.1 |
Due after one year through five years | 2,551.5 |  |  | 2,539.5 |
Due after five years through ten years | 578.3 |  |  | 551.4 |
Due after ten years | — |  |  | — |
| 3,903.4 |  |  | 3,861.0 |
Agency commercial mortgage-backed | 5.0 |  |  | 4.5 |
Agency residential mortgage-backed | 616.6 |  |  | 556.7 |
Asset-backed | 224.0 |  |  | 225.4 |
Total investments, available for sale | $ | 4,749.0 |  |  | $ | 4,647.6 |
| As at December 31, 2023
| Amortized Cost or Cost |  | Fair Market Value
| ($ in millions)
Due one year or less | $ | 512.0 |  |  | $ | 505.8 |
Due after one year through five years | 2,889.0 |  |  | 2,818.9 |
Due after five years through ten years | 495.1 |  |  | 440.3 |
Due after ten years | 15.7 |  |  | 15.2 |
| 3,911.8 |  |  | 3,780.2 |
Agency commercial mortgage-backed | 6.6 |  |  | 5.8 |
Agency residential mortgage-backed | 519.9 |  |  | 445.1 |
Total investments, available for sale | $ | 4,438.3 |  |  | $ | 4,231.1 |
The following tables summarize, by type of security, the aggregate fair value and gross unrealized loss by length of time the security has been in an unrealized loss position for the Company’s available for sale portfolio as at September 30, 2024 and December 31, 2023:
| As at September 30, 2024
| 0-12 months |  | Over 12 months |  | Total
| Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Number of Securities
| ($ in millions) |  |
Fixed income securities, available for sale |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government | $ | 126.0 |  |  | $ | (0.7) |  |  | $ | 560.2 |  |  | $ | (13.1) |  |  | $ | 686.2 |  |  | $ | (13.8) |  |  | 65
U.S. agency | — |  |  | — |  |  | 7.4 |  |  | (0.1) |  |  | 7.4 |  |  | (0.1) |  |  | 1
Municipal | — |  |  | — |  |  | 66.2 |  |  | (1.6) |  |  | 66.2 |  |  | (1.6) |  |  | 37
Corporate | 59.0 |  |  | (0.3) |  |  | 920.7 |  |  | (58.2) |  |  | 979.7 |  |  | (58.5) |  |  | 435
Non-U.S. government-backed corporate | 4.2 |  |  | — |  |  | 102.9 |  |  | (3.1) |  |  | 107.1 |  |  | (3.1) |  |  | 12
Non-U.S. government | 23.6 |  |  | — |  |  | 114.6 |  |  | (2.2) |  |  | 138.2 |  |  | (2.2) |  |  | 37
Asset-backed | 18.8 |  |  | (0.2) |  |  | — |  |  | — |  |  | 18.8 |  |  | (0.2) |  |  | 12
Agency commercial mortgage-backed | — |  |  | — |  |  | 4.6 |  |  | (0.5) |  |  | 4.6 |  |  | (0.5) |  |  | 1
Agency residential mortgage-backed | 13.1 |  |  | — |  |  | 392.5 |  |  | (63.5) |  |  | 405.6 |  |  | (63.5) |  |  | 181
Total fixed income securities, available for sale | $ | 244.7 |  |  | $ | (1.2) |  |  | $ | 2,169.1 |  |  | $ | (142.3) |  |  | $ | 2,413.8 |  |  | $ | (143.5) |  |  | 781
| As at December 31, 2023
| 0-12 months |  | Over 12 months |  | Total
| Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Fair Market Value |  | Gross Unrealized Losses |  | Number of Securities
| ($ in millions) |  |
Fixed income securities, available for sale |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government | $ | 105.5 |  |  | $ | (0.5) |  |  | $ | 673.3 |  |  | $ | (26.2) |  |  | $ | 778.8 |  |  | $ | (26.7) |  |  | 74
U.S. agency | — |  |  | — |  |  | 7.2 |  |  | (0.3) |  |  | 7.2 |  |  | (0.3) |  |  | 1
Municipal | 11.1 |  |  | (1.0) |  |  | 117.0 |  |  | (4.0) |  |  | 128.1 |  |  | (5.0) |  |  | 54
Corporate | 46.7 |  |  | (0.4) |  |  | 1,287.2 |  |  | (101.1) |  |  | 1,333.9 |  |  | (101.5) |  |  | 558
Non-U.S. government-backed corporate | 0.2 |  |  | — |  |  | 95.5 |  |  | (5.9) |  |  | 95.7 |  |  | (5.9) |  |  | 12
Non-U.S. government | 32.9 |  |  | (0.2) |  |  | 180.1 |  |  | (6.5) |  |  | 213.0 |  |  | (6.7) |  |  | 53
Agency commercial mortgage-backed | — |  |  | — |  |  | 5.8 |  |  | (0.8) |  |  | 5.8 |  |  | (0.8) |  |  | 1
Agency residential mortgage-backed | 0.1 |  |  | — |  |  | 435.9 |  |  | (74.9) |  |  | 436.0 |  |  | (74.9) |  |  | 197
Total fixed income securities, available for sale | $ | 196.5 |  |  | $ | (2.1) |  |  | $ | 2,802.0 |  |  | $ | (219.7) |  |  | $ | 2,998.5 |  |  | $ | (221.8) |  |  | 950
Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Trading Investments in Fixed Income Maturities | he following tables present the cost or amortized cost, gross unrealized gains and losses, and estimated fair market value of trading investments in fixed income securities, short-term investments, catastrophe bonds and privately-held investments as at December 31, 2023 and December 31, 2022:
| As at December 31, 2023
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
| ($ in millions)
Fixed Income Securities — Trading |  |  |  |  |  |  |
U.S. government | $ | 248.7 |  |  | $ | 0.5 |  |  | $ | (3.7) |  |  | $ | 245.5 |
Municipal | 3.3 |  |  | — |  |  | (0.2) |  |  | 3.1 |
Corporate | 178.8 |  |  | 0.7 |  |  | (8.0) |  |  | 171.5 |
High yield loans | 90.8 |  |  | 1.3 |  |  | — |  |  | 92.1 |
Non-U.S. government-backed corporate | 8.6 |  |  | — |  |  | (0.3) |  |  | 8.3 |
Non-U.S. government | 35.8 |  |  | 0.1 |  |  | (1.1) |  |  | 34.8 |
Asset-backed | 936.0 |  |  | 2.1 |  |  | (29.9) |  |  | 908.2 |
Agency mortgage-backed | 25.0 |  |  | — |  |  | (2.8) |  |  | 22.2 |
Total fixed income securities — Trading | 1,527.0 |  |  | 4.7 |  |  | (46.0) |  |  | 1,485.7 |
Short-term investments — Trading | 2.1 |  |  | — |  |  | — |  |  | 2.1 |
Catastrophe bonds — Trading | 1.6 |  |  | — |  |  | — |  |  | 1.6 |
Privately-held investments — Tradin g |  |  |  |  |  |  |
Commercial mortgage loans | 293.2 |  |  | 1.0 |  |  | (19.3) |  |  | 274.9 |
Middle market loans and other private debt | 85.9 |  |  | — |  |  | (1.1) |  |  | 84.8 |
Asset-backed securities | 83.1 |  |  | 0.4 |  |  | (0.6) |  |  | 82.9 |
Global corporate securities | 14.7 |  |  | — |  |  | (0.3) |  |  | 14.4 |
Short-term investments | 18.0 |  |  | — |  |  | — |  |  | 18.0 |
Total privately-held investments — Trading | 494.9 |  |  | 1.4 |  |  | (21.3) |  |  | 475.0 |
Total Investments — Trading | $ | 2,025.6 |  |  | $ | 6.1 |  |  | $ | (67.3) |  |  | $ | 1,964.4 |
| As at December 31, 2022
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
| ($ in millions)
Fixed Income Securities — Trading |  |  |  |  |  |  |
U.S. government | $ | 267.9 |  |  | $ | — |  |  | $ | (6.3) |  |  | $ | 261.6 |
Municipal | 3.9 |  |  | — |  |  | (0.3) |  |  | 3.6 |
Corporate | 175.3 |  |  | 0.3 |  |  | (13.5) |  |  | 162.1 |
High yield loans | 90.2 |  |  | 0.2 |  |  | (2.1) |  |  | 88.3 |
Non-U.S. government-backed corporate | 12.2 |  |  | — |  |  | (0.6) |  |  | 11.6 |
Non-U.S. government | 32.2 |  |  | — |  |  | (1.8) |  |  | 30.4 |
Asset-backed | 970.3 |  |  | 0.2 |  |  | (74.0) |  |  | 896.5 |
Agency mortgage-backed | 24.7 |  |  | — |  |  | (3.3) |  |  | 21.4 |
Total fixed income securities — Trading | 1,576.7 |  |  | 0.7 |  |  | (101.9) |  |  | 1,475.5 |
Short-term investments — Trading | 6.3 |  |  | — |  |  | — |  |  | 6.3 |
Catastrophe bonds — Trading | 5.1 |  |  | — |  |  | (2.2) |  |  | 2.9 |
Privately-held investments — Trading |  |  |  |  |  |  |
Commercial mortgage loans | 312.6 |  |  | 0.6 |  |  | (1.1) |  |  | 312.1 |
Middle market loans and other private debt | 109.0 |  |  | — |  |  | (2.1) |  |  | 106.9 |
Asset-backed securities | 68.8 |  |  | — |  |  | (2.0) |  |  | 66.8 |
Global corporate securities | 15.1 |  |  | — |  |  | (0.1) |  |  | 15.0 |
Equity securities | 6.6 |  |  | — |  |  | — |  |  | 6.6 |
Short-term investments | 25.6 |  |  | — |  |  | — |  |  | 25.6 |
Total privately-held investments — Trading | 537.7 |  |  | 0.6 |  |  | (5.3) |  |  | 533.0 |
Total Investments — Trading | $ | 2,125.8 |  |  | $ | 1.3 |  |  | $ | (109.4) |  |  | $ | 2,017.7 |
The following tables present the cost or amortized cost, gross unrealized gains and losses, and estimated fair market value of trading investments in fixed income securities, short-term investments, catastrophe bonds and privately-held investments as at September 30, 2024 and December 31, 2023:
| As at September 30, 2024
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
| ($ in millions)
Fixed income securities, trading |  |  |  |  |  |  |
U.S. government | $ | 262.4 |  |  | $ | 5.9 |  |  | $ | (1.2) |  |  | $ | 267.1 |
Municipal | 2.1 |  |  | — |  |  | (0.1) |  |  | 2.0 |
Corporate | 155.0 |  |  | 1.6 |  |  | (4.0) |  |  | 152.6 |
High yield loans | 106.7 |  |  | 0.6 |  |  | (0.3) |  |  | 107.0 |
Non-U.S. government-backed corporate | 6.4 |  |  | — |  |  | (0.1) |  |  | 6.3 |
Non-U.S. government | 24.2 |  |  | 0.2 |  |  | (0.2) |  |  | 24.2 |
Asset-backed | 688.5 |  |  | 4.1 |  |  | (3.9) |  |  | 688.7 |
Agency mortgage-backed | 35.2 |  |  | 0.5 |  |  | (2.3) |  |  | 33.4 |
Total fixed income securities, trading | 1,280.5 |  |  | 12.9 |  |  | (12.1) |  |  | 1,281.3 |
Short-term investments, trading | 3.2 |  |  | — |  |  | — |  |  | 3.2 |
Catastrophe bonds, trading | 1.0 |  |  | — |  |  | — |  |  | 1.0 |
Privately-held investments, trading |  |  |  |  |  |  |
Commercial mortgage loans | 161.4 |  |  | 0.7 |  |  | (28.4) |  |  | 133.7 |
Middle market loans and other private debt | 64.4 |  |  | 0.1 |  |  | (0.5) |  |  | 64.0 |
Asset-backed securities | 129.0 |  |  | 0.5 |  |  | (0.3) |  |  | 129.2 |
Global corporate securities | 14.4 |  |  | — |  |  | (0.1) |  |  | 14.3 |
Total privately-held investments, trading | 369.2 |  |  | 1.3 |  |  | (29.3) |  |  | 341.2 |
Total investments, trading | $ | 1,653.9 |  |  | $ | 14.2 |  |  | $ | (41.4) |  |  | $ | 1,626.7 |
| As at December 31, 2023
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
| ($ in millions)
Fixed income securities, trading |  |  |  |  |  |  |
U.S. government | $ | 248.7 |  |  | $ | 0.5 |  |  | $ | (3.7) |  |  | $ | 245.5 |
Municipal | 3.3 |  |  | — |  |  | (0.2) |  |  | 3.1 |
Corporate | 178.8 |  |  | 0.7 |  |  | (8.0) |  |  | 171.5 |
High yield loans | 90.8 |  |  | 1.3 |  |  | — |  |  | 92.1 |
Non-U.S. government-backed corporate | 8.6 |  |  | — |  |  | (0.3) |  |  | 8.3 |
Non-U.S. government | 35.8 |  |  | 0.1 |  |  | (1.1) |  |  | 34.8 |
Asset-backed | 936.0 |  |  | 2.1 |  |  | (29.9) |  |  | 908.2 |
Agency mortgage-backed | 25.0 |  |  | — |  |  | (2.8) |  |  | 22.2 |
Total fixed income securities, trading | 1,527.0 |  |  | 4.7 |  |  | (46.0) |  |  | 1,485.7 |
Short-term investments, trading | 2.1 |  |  | — |  |  | — |  |  | 2.1 |
Catastrophe bonds, trading | 1.6 |  |  | — |  |  | — |  |  | 1.6 |
Privately-held investments, trading |  |  |  |  |  |  |
Commercial mortgage loans | 293.2 |  |  | 1.0 |  |  | (19.3) |  |  | 274.9 |
Middle market loans and other private debt | 85.9 |  |  | — |  |  | (1.1) |  |  | 84.8 |
Asset-backed securities | 83.1 |  |  | 0.4 |  |  | (0.6) |  |  | 82.9 |
Global corporate securities | 14.7 |  |  | — |  |  | (0.3) |  |  | 14.4 |
Short-term investments | 18.0 |  |  | — |  |  | — |  |  | 18.0 |
Total privately-held investments, trading | 494.9 |  |  | 1.4 |  |  | (21.3) |  |  | 475.0 |
Total investments, trading | $ | 2,025.6 |  |  | $ | 6.1 |  |  | $ | (67.3) |  |  | $ | 1,964.4 |
Schedule of Commercial Mortgage and Middle Market Loans | The table below shows the Company’s investments in MVI, Multi-Line Reinsurer and Digital Re for the twelve months ended December 31, 2023 and 2022:
| MVI |  | Multi-Line Reinsurer |  | Digital Re |  | Total
| ($ in millions)
Opening undistributed value of investment as at January 1, 2023 | $ | 0.8 |  |  | $ | 5.2 |  |  | $ | 0.2 |  |  | $ | 6.2 |
Investment in the period | — |  |  | 0.4 |  |  | — |  |  | 0.4 |
Distribution received | — |  |  | — |  |  | — |  |  | — |
Unrealized gain for the twelve months to December 31, 2023 | 0.2 |  |  | 0.8 |  |  | — |  |  | 1.0 |
Closing value of investment as at December 31, 2023 | 1.0 |  |  | 6.4 |  |  | 0.2 |  |  | 7.6 |
Opening undistributed value of investment as at January 1, 2022 | $ | 0.5 |  |  | $ | 3.2 |  |  | $ | 0.2 |  |  | $ | 3.9 |
Investment in the period | 0.4 |  |  | 1.6 |  |  | — |  |  | 2.0 |
Distribution received | — |  |  | — |  |  | — |  |  | — |
Unrealized (loss)/gain for the twelve months to December 31, 2022 | (0.1) |  |  | 0.4 |  |  | — |  |  | 0.3 |
Closing value of investments at December 31, 2022 | $ | 0.8 |  |  | $ | 5.2 |  |  | $ | 0.2 |  |  | $ | 6.2 |
The table below shows the Company’s investments in MVI, Multi-Line Reinsurer and Digital Re for the nine months ended September 30, 2024 and the twelve months ended December 31, 2023:
| MVI |  | Multi-Line Reinsurer |  | Digital Re |  | Total
| ($ in millions)
Opening undistributed value of investment as at January 1, 2024 | $ | 1.0 |  |  | $ | 6.4 |  |  | $ | 0.2 |  |  | $ | 7.6 |
Investment in the period | — |  |  | — |  |  | — |  |  | — |
Distribution received | — |  |  | — |  |  | — |  |  | — |
Unrealized gain for the period | 0.1 |  |  | 0.4 |  |  | — |  |  | 0.5 |
Closing value of investments as at September 30, 2024 | $ | 1.1 |  |  | $ | 6.8 |  |  | $ | 0.2 |  |  | $ | 8.1 |
Opening undistributed value of investment as at January 1, 2023 | $ | 0.8 |  |  | $ | 5.2 |  |  | $ | 0.2 |  |  | $ | 6.2 |
Investment in the period | — |  |  | 0.4 |  |  | — |  |  | 0.4 |
Distribution received | — |  |  | — |  |  | — |  |  | — |
Unrealized gain for the period | 0.2 |  |  | 0.8 |  |  | — |  |  | 1.0 |
Closing value of investments as at December 31, 2023 | $ | 1.0 |  |  | $ | 6.4 |  |  | $ | 0.2 |  |  | $ | 7.6 |

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- Definition Tabular disclosure of the terms and amounts of participation in loan arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 30 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481212/470-30-50-1 + Details
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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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