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Loss and Loss Adjustment Expense Reserves (Tables)
6 Months Ended
Jun. 30, 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 and six months ended June 30, 2023 and 2022:

Three Months Ended June 30,Six Months Ended June 30,
Millions2023202220232022
Gross beginning balance$1,345.6 $999.6 $1,296.5 $894.7 
Less: beginning reinsurance recoverable on unpaid losses (1)
(348.9)(396.0)(505.0)(428.9)
Net loss and LAE reserves996.7 603.6 791.5 465.8 
Loss and LAE incurred relating to:
Current year losses156.5 143.2 295.7 268.9 
Prior year losses11.0 (22.7)19.6 (26.4)
Net incurred losses and LAE167.5 120.5 315.3 242.5 
Loss and LAE paid relating to:
Current year losses(5.6)(14.1)(9.6)(14.7)
Prior year losses(103.0)(54.4)(190.7)(93.8)
Net paid loss and LAE(108.6)(68.5)(200.3)(108.5)
Change in TPC Providers’ participation (2)
 — 145.4 57.5 
Foreign currency translation and other adjustments to loss
   and LAE reserves
2.7 (9.0)6.4 (10.7)
Net ending balance1,058.3 646.6 1,058.3 646.6 
Plus: ending reinsurance recoverable on unpaid losses (3)
362.7 375.5 362.7 375.5 
Gross ending balance$1,421.0 $1,022.1 $1,421.0 $1,022.1 
(1) The beginning reinsurance recoverable on unpaid losses includes amounts attributable to TPC Providers of $0.0 and $207.3 for the three months ended June 30, 2023 and 2022 and $145.4 and $276.8 for the six months ended June 30, 2023 and 2022.
(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 $182.4 as of June 30, 2023 and 2022.