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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Line of Credit Facilities
At December 31, 2025 and 2024, the Group had the following letter of credit facilities:
December 31, 2025December 31, 2024
BankCommitmentIn UseDate of ExpiryCommitmentIn UseDate of Expiry
Lloyds Bank plc(1)(2)
Unsecured$20.0 $8.8 September 21, 2028$25.0 $19.9 September 21, 2025
Secured115.0 52.0 September 21, 2028100.0 58.1 September 21, 2025
Total Lloyds Bank Plc135.0 60.8 125.0 78.0 
Citibank N.A. London branch(1)(2)
Secured70.0 28.4 December 31, 202670.0 42.9 December 31, 2025
Total Citibank N.A. London branch70.0 28.4 70.0 42.9 
Barclays Bank plc(1)(2)
Unsecured20.0 11.8 September 13, 202860.0 52.2 September 13, 2025
Secured115.0 32.0 September 13, 202880.0 31.0 September 13, 2025
Total Barclays Bank plc135.0 43.8 140.0 83.2 
Bank of Montreal(1)(2)
Unsecured40.0 8.3 September 18, 202640.0 30.7 September 18, 2025
Secured100.0 37.7 September 18, 2026100.0 41.2 September 18, 2025
Total Bank of Montreal140.0 46.0 140.0 71.9 
Total letters of credit facilities$480.0 $179.0 $475.0 $276.0 
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(1)Letters of credit can be issued under the secured letter of credit facilities for the purposes of supporting insurance and reinsurance obligations.
(2)The Facility agreements allow for additional capacity in the form of accordions and uncommitted amounts. The maximum additional capacity from the lenders as of December 31, 2025 was: Lloyds Bank plc $65.0 million; Citibank N.A. London Branch $200.0 million; Barclays Bank plc $65.0 million; and Bank of Montreal $60.0 million.
The following table shows the value of the collateral underlying the secured letter of credit facilities:
BankDecember 31, 2025December 31, 2024
Lloyds Bank plc$57.2 $68.5 
Citibank N.A. London branch32.7 46.9 
Barclays Bank plc35.3 54.5 
Bank of Montreal51.9 46.2 
Total$177.1 $216.1 
Schedule of Ceded Credit Risk
The following table sets forth the Group’s premiums written by broker that individually contributed more than 10% of total gross premiums written for the years ended December 31, 2025, 2024 and 2023:
202520242023
Aon plc19 %13 %13 %
Marsh & McLennan Companies Inc16 %20 %18 %
Schedule of Assets And Liabilities, Lessee
The following table presents the Group’s operating lease right-of-use assets and lease liabilities:
December 31, 2025December 31, 2024
Operating lease right-of-use assets (1)
$9.8 $11.1 
Operating lease liabilities (2)
$12.4 $13.0 
Weighted-average remaining lease term (years)6.47.2
Weight-average discount rate10.8 %10.8 %
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(1)Operating lease right-of-use assets are included in other assets
(2)Operating lease liabilities are included in other liabilities
Schedule of Lessee, Operating Lease, Liability, to be Paid, Maturity
Future minimum lease commitments at December 31, 2025 under these leases are expected to be as follows:
Future Payments
2026$3.0 
20272.9
20282.6
20292.3
20302.3
2031 and thereafter3.7
Total future annual minimum lease payments16.8
Less: present value discount(4.4)
Total lease liability at December 31, 2025
$12.4