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Loss and Loss Adjustment Expense Reserves (Tables)
3 Months Ended
Mar. 31, 2024
Insurance [Abstract]  
Schedule of liability for unpaid claims and claims adjustment expense
The following table summarizes the loss and loss adjustment expense (“LAE”) reserve activity of the Ark/WM Outrigger segment for the three months ended March 31, 2024 and 2023:

Three Months Ended March 31,
Millions20242023
Gross beginning balance$1,605.1 $1,296.5 
Less: beginning reinsurance recoverable on unpaid losses (1)
(340.8)(505.0)
Net loss and loss adjustment expense reserves1,264.3 791.5 
Loss and loss adjustment expenses incurred relating to:
Current year losses180.3 139.2 
Prior year losses(.3)8.6 
Net incurred loss and loss adjustment expenses180.0 147.8 
Loss and loss adjustment expenses paid relating to:
Current year losses(4.0)(4.0)
Prior year losses(96.7)(87.7)
Net paid loss and loss adjustment expenses(100.7)(91.7)
Change in TPC Providers’ participation (2)
 145.4 
Foreign currency translation and other adjustments to loss and loss adjustment
   expense reserves
(3.6)3.7 
Net ending balance1,340.0 996.7 
Plus: ending reinsurance recoverable on unpaid losses404.5 348.9 
Gross ending balance$1,744.5 $1,345.6 
(1) The beginning reinsurance recoverable on unpaid losses includes amounts attributable to TPC Providers of $145.4 as of December 31, 2022.
(2) Amount represents the impact to net loss and loss adjustment expense reserves due to a change in the TPC Providers’ participation related to the annual RITC process.