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Loss and Loss Adjustment Expense Reserves (Tables)
9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2024 and 2023:

Three Months Ended September 30,Nine Months Ended September 30,
Millions2024202320242023
Gross beginning balance$1,890.1 $1,421.0 $1,605.1 $1,296.5 
Less: beginning reinsurance recoverable on unpaid losses (1)
(458.5)(362.7)(340.8)(505.0)
Net loss and loss adjustment expense reserves1,431.6 1,058.3 1,264.3 791.5 
Loss and loss adjustment expenses incurred relating to:
Current year losses313.1 266.4 676.0 562.1 
Prior year losses(24.8)(.6)(32.0)19.0 
Net incurred loss and loss adjustment expenses288.3 265.8 644.0 581.1 
Loss and loss adjustment expenses paid relating to:
Current year losses(19.1)(8.8)(27.4)(18.4)
Prior year losses(86.3)(90.4)(261.8)(281.1)
Net paid loss and loss adjustment expenses(105.4)(99.2)(289.2)(299.5)
Change in TPC Providers’ participation (2)
 —  145.4 
Foreign currency translation and other adjustments to loss
   and loss adjustment expense reserves
11.3 (5.5)6.7 .9 
Net ending balance1,625.8 1,219.4 1,625.8 1,219.4 
Plus: ending reinsurance recoverable on unpaid losses507.2 352.4 507.2 352.4 
Gross ending balance$2,133.0 $1,571.8 $2,133.0 $1,571.8 
(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.