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Loss and Loss Adjustment Expense Reserves (Tables)
3 Months Ended
Mar. 31, 2023
Insurance Loss Reserves [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, 2023 and 2022:

Three Months Ended March 31,
Millions20232022
Gross beginning balance$1,296.5 $894.7 
Less: beginning reinsurance recoverable on unpaid losses (1)
(505.0)(428.9)
Net loss and LAE reserves791.5 465.8 
Loss and LAE incurred relating to:
Current year losses139.2 125.7 
Prior year losses8.6 (3.7)
Net incurred losses and LAE147.8 122.0 
Loss and LAE paid relating to:
Current year losses(4.0)(.6)
Prior year losses(87.7)(39.4)
Net paid loss and LAE(91.7)(40.0)
Change in TPC Providers’ participation (2)
145.4 57.5 
Foreign currency translation and other adjustments to loss and LAE
   reserves
3.7 (1.7)
Net ending balance996.7 603.6 
Plus: ending reinsurance recoverable on unpaid losses (3)
348.9 396.0 
Gross ending balance$1,345.6 $999.6 
(1) The beginning reinsurance recoverable on unpaid losses includes amounts attributable to TPC Providers of $145.4 and $276.8 as of December 31, 2022 and 2021.
(2) Amount represents the impact to net loss and LAE reserves due to a change in the TPC Providers’ participation related to the annual reinsurance to close process.
(3) The ending reinsurance recoverable on unpaid losses includes amounts attributable to TPC Providers of $0.0 and $207.3 as of March 31, 2023 and 2022.