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Reserves for Losses and Loss Adjustment Expenses (Tables)
 3 Months Ended
Mar. 31, 2025
Insurance [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
The following table presents a reconciliation of reserves for losses and loss adjustment expenses for the three months ended March 31, 2025 and 2024:
March 31, 2025March 31, 2024
Reserves for losses and loss adjustment expenses, beginning of period$3,134.3 $2,448.9 
Reinsurance recoverable on reserves for losses and loss adjustment expenses(1,255.6)(1,108.6)
Net reserves for losses and loss adjustment expenses, beginning of period1,878.7 1,340.3 
Net losses and loss adjustment expenses incurred in respect of losses occurring in:
Current year470.0 249.3 
Prior years(40.8)(67.0)
Total incurred
429.2 182.3 
Net losses and loss adjustment expenses paid in respect of losses occurring in:
Current year(89.4)(6.0)
Prior years(610.9)(101.3)
Total paid
(700.3)(107.3)
Foreign exchange8.9 (9.4)
Net reserves for losses and loss adjustment expenses, end of period1,616.5 1,405.9 
Reinsurance recoverable on reserves for losses and loss adjustment expenses1,491.9 1,135.2 
Reserves for losses and loss adjustment expenses, end of period$3,108.4 $2,541.1