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Investments
 12 Months Ended
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Investments
4.           Investments
At December 31, 2025, the Group’s investments are substantially all managed by external investment managers through individual investment management agreements. The Group monitors activity and performance of the external managers on an ongoing basis.
a.Fixed maturity securities
The following table summarizes the fair value of fixed maturity investments:
December 31, 2025
Amortized CostUnrealized
gains		Unrealized
losses		Fair
value
U.S. Treasuries$477.8 $6.6 $(0.2)$484.2 
Agencies6.9 — — 6.9 
Non-U.S. government46.6 0.6 — 47.2 
Corporate bonds1,616.8 35.7 (0.3)1,652.2 
Residential mortgage-backed244.3 5.6 — 249.9 
Commercial mortgage-backed1.0 — — 1.0 
Other asset-backed securities197.2 1.9 (0.1)199.0 
Total fixed maturity securities$2,590.6 $50.4 $(0.6)$2,640.4 
December 31, 2024
Amortized CostUnrealized
gains		Unrealized
losses		Fair
value
U.S. Treasuries$747.6 $2.1 $(3.1)$746.6 
Agencies11.5 — — 11.5 
Non-U.S. government46.6 0.1 (0.3)46.4 
Corporate bonds1,906.3 10.9 (4.0)1,913.2 
Residential mortgage-backed279.5 0.8 (1.2)279.1 
Commercial mortgage-backed— 0.4 — 0.4 
Other asset-backed securities412.3 2.3 (0.2)414.4 
Total fixed maturity securities$3,403.8 $16.6 $(8.8)$3,411.6 
Review of the fixed maturity securities is performed on a regular basis to consider concentration, credit quality and compliance with established guidelines. For individual fixed maturity securities, nationally recognized statistical rating organizations are used and the middle of three ratings or the lower of two is taken. The composition of the fair values of fixed maturity securities by credit rating is as follows:
December 31, 2025December 31, 2024
Fair Value%Fair Value%
AAA$216.1 9%$399.4 12%
AA891.2 34%1,245.6 37%
A1,118.8 42%1,270.9 37%
BBB382.8 14%453.1 13%
Below BBB31.5 1%42.6 1%
Total fixed maturity securities$2,640.4 100%$3,411.6 100%
The contractual maturities for fixed maturity securities are listed in the following table:
December 31, 2025December 31, 2024
Amortized CostFair ValueAmortized CostFair Value
Due in one year or less$233.0 $234.2 $147.9 $147.6 
Due after one year through five years1,503.5 1,532.4 2,141.2 2,149.8 
Due after five years through ten years520.3 534.3 767.7 766.7 
Due after ten years333.8 339.5 347.0 347.5 
Total fixed maturity securities$2,590.6 $2,640.4 $3,403.8 $3,411.6 
Expected maturities may differ from contractual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Additionally, lenders may have the right to put the securities back to the borrower.
b.Short-term investments
The Group’s short-term investments consist of U.S. Treasuries, corporate bonds and other asset-backed securities with maturities of 90 days or greater but less than one year at the time of purchase:
December 31, 2025
Amortized CostUnrealized
gains		Unrealized
losses		Fair
value
U.S. Treasuries$109.9 $— $— $109.9 
Corporate bonds1.0 — — 1.0 
Other asset-backed securities0.4 — — 0.4 
Total short-term investments$111.3 $— $— $111.3 
December 31, 2024
Amortized CostUnrealized
gains		Unrealized
losses		Fair
value
U.S. Treasuries$220.5 $0.2 $— $220.7 
Corporate bonds1.1 — — 1.1 
Other asset-backed securities0.3 — — 0.3 
Total short-term investments$221.9 $0.2 $— $222.1 
The composition of the fair values of short-term investments by credit rating is as follows:
December 31, 2025December 31, 2024
Fair Value%Fair Value%
AAA$0.4 —%$0.3 —%
AA109.9 99%220.7 100%
A0.7 1%— —%
BBB0.2 —%0.2 —%
Below BBB0.1 —%0.9 —%
Total short-term investments$111.3 100%$222.1 100%
c.Available-for-sale - net loss position
The following table summarizes, 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 Group’s available-for-sale portfolio:
December 31, 2025
0 - 12 months> 12 months
Fair
value		Gross unrealized lossesGross unrealized lossesNumber of securities
U.S. Treasuries$50.1 $(0.1)$(0.1)49 
Non-U.S. government5.3 — — 3 
Corporate bonds53.3 (0.3)— 132 
Residential mortgage-backed2.2 — — 1 
Other asset-backed securities25.3 (0.1)— 30 
Total$136.2 $(0.5)$(0.1)215 
December 31, 2024
0 - 12 months> 12 months
Fair
value		Gross unrealized lossesGross unrealized lossesNumber of securities
U.S. Treasuries$307.6 $(2.8)$(0.3)48 
Agencies4.0 — — 2 
Non-U.S. government23.7 (0.1)(0.2)11 
Corporate bonds543.6 (3.4)(0.6)310 
Residential mortgage-backed91.9 (1.1)(0.1)35 
Other asset-backed securities64.7 (0.2)— 25 
Total$1,035.5 $(7.6)$(1.2)431 
At December 31, 2025 on a security level basis, 215 securities out of a total of approximately 1,624 securities were in an unrealized loss position and the largest unrealized loss from a single security in the Group’s fixed maturity portfolio was $0.1 million. At December 31, 2024, on a security level basis, 431 securities out of a total of approximately 1,713 securities were in an unrealized loss position and the largest unrealized loss from a single security in the Group’s fixed maturity portfolio was $0.5 million.
d.Allowance for expected credit losses - available-for-sale
The following table provides a roll forward of the allowance for expected credit losses of the Group’s securities classified as available-for-sale:
202520242023
Balance at beginning of year$5.9 $1.3 $1.1 
Expected credit losses on securities where credit losses were not previously recognized1.8 7.3 4.1 
Reductions for expected credit losses on securities where credit losses were previously recognized(6.2)(2.4)(3.5)
Securities sold/redeemed/matured(0.9)(0.3)(0.4)
Balance at end of year$0.6 $5.9 $1.3 
The Group assesses each quarter whether the decline in fair value of an available-for-sale security below its amortized cost is the result of a credit loss. All available-for-sale securities with unrealized losses are reviewed. The Group considers many factors to determine whether a credit loss exists, including the extent to which fair value is below cost, the implied yield to maturity, rating downgrades of the security and whether or not the issuer has failed to make scheduled principal or interest payments. The Group also takes into consideration information about the financial condition of the issuer and industry factors that could negatively impact the capital markets.
If the decline in fair value of an available-for-sale security below its amortized cost is considered to be the result of a credit loss, the Group compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the expected credit loss, which is recorded as an allowance and recognized in net income.
e.Other investments, at fair value
The following table provides a summary of the Group’s other investments by investment strategy:
December 31, 2025December 31, 2024
Fair Value%Fair Value%
Fixed income funds$243.0 50%$— —%
Hedge funds
Credit25.0 5%22.3 12%
Global macro41.6 9%44.8 22%
Long/short67.4 14%44.9 22%
Multi-strategy and event-driven96.8 20%89.0 44%
Total hedge funds230.8 48%201.0 100%
Private credit funds11.92%——%
Total other investments$485.7 100%$201.0 100%
The fixed income fund investments are structured as commingled investment funds managed by third-party managers. During 2025 the Group invested in:
•A UCITS (Undertakings for Collective Investment in Transferable Securities) fund that is actively investing in primarily global investment-grade credit securities. The fund has an average credit rating of A.
•An ICAV (Irish collective asset-management vehicle) fund that is structured as a limited partnership. The fund invests in a diverse portfolio of primarily high yield corporate debt securities and bank loans. The fund has an average credit rating of B+.
•An open-ended Luxembourg based fund that is investing in investment-grade and short-dated subscription line financing for private funds. The fund has an average credit rating of AA.
At December 31, 2025, approximately $63.4 million (December 31, 2024: $nil) of the fixed income funds were subject to lock-ups or hold-backs and are not redeemable within twelve months. The remaining funds can be redeemed within 30 days’ notice.
At December 31, 2025, the Group had $12.2 million (December 31, 2024: $nil) of unfunded investment commitments to fixed income funds, which are callable by the relevant investment managers.
In 2024, the Group invested in a number of hedge funds which are structured as limited partnerships and are managed by third-party managers. The individual hedge fund strategies include credit, global macro, long/short, multi strategy and event-driven.
Other investments in hedge funds are redeemable over periods ranging from one month to greater than twelve months. The common redemption restrictions which may impact the Group's ability to redeem hedge funds are lock-up periods, hold-backs and gates. A lock-up period is the initial amount of time an investor is contractually required to remain invested in the fund before having the ability to redeem in whole or in part. A hold-back entitles the fund to retain up to 10% of a total redemption request, pending completion of the external audit for the financial year in which the redemption occurs. A gate is a suspension of redemptions which may be implemented by the investment manager of the fund to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a specified percentage of the fund’s net assets. At December 31, 2025, approximately 94% (December 31, 2024: 80%) of the total hedge fund investment can be redeemed within the next twelve months, while approximately 6% (December 31, 2024: 20%) of the total hedge fund investment could be subject to lock-ups or hold-backs and are not redeemable within twelve months. At December 31, 2025, approximately 1% (December 31, 2024: —%) of the hedge funds were subject to a gate. At December 31, 2025, we committed an additional $110 million to invest in hedge funds. These trades had an effective date of January 1, 2026.
In 2025 the Group invested in a private credit fund which is structured as a limited partnership and is managed by a third-party manager. The private credit fund strategy includes investing in portfolio debt securities related to certain private credit asset classes, including direct lending, specialty finance and credit opportunities.
At December 31, 2025 the Group had $108.1 million (December 31, 2024: $nil) of unfunded commitments as a limited partner in private credit funds. The Company generally has no right to redeem its interest in any of these private credit funds in advance of dissolution of the applicable limited partnerships. Instead, distributions are received by the Company in connection with the liquidation or maturity of the underlying private credit assets of the fund. It is estimated that the majority of the underlying assets of the limited partnerships will liquidate over 5 to 10 years from inception of the limited partnership.
f.Net investment income and net realized and unrealized investment gains
The components of net investment return are as follows:
202520242023
Net interest and dividend income$192.6 $195.8 $123.5 
Investment expenses(8.6)(5.3)(4.0)
Net investment income184.0 190.5 119.5 
Net realized and unrealized gains on other investments12.9 0.7 5.8 
Net realized gains/(losses) on fixed maturity securities, available-for-sale4.6 (24.7)(0.7)
Change in provision for expected credit losses 5.3 (4.6)(0.2)
Net realized and unrealized investment gains/(losses)22.8 (28.6)4.9 
Total realized and unrealized investments gains/(losses) and net investment income$206.8 $161.9 $124.4