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Loss and Loss Adjustment Expense Reserves (Tables)
 12 Months Ended
Dec. 31, 2021
Insurance Loss Reserves [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense The following table summarizes the loss and LAE reserve activity of Ark’s insurance and reinsurance subsidiaries for the year ended December 31, 2021:
MillionsYear Ended
December 31, 2021
Gross beginning balance$696.0 
Less: beginning reinsurance recoverable on unpaid losses (1)
(433.4)
Net loss and LAE reserves262.6 
Losses and LAE incurred relating to:
      Current year losses336.3 
      Prior year losses(21.5)
Net incurred losses and LAE314.8 
Loss and LAE paid relating to:
Current year losses(43.9)
   Prior year losses(61.6)
Net paid losses and LAE(105.5)
Change in TPC Providers’ participation (2)
(2.2)
Foreign currency translation and other adjustments to loss and LAE reserves(3.9)
Net ending balance465.8 
Plus: ending reinsurance recoverable on unpaid losses (1)
428.9 
Gross ending balance$894.7 
(1) The beginning reinsurance recoverable on unpaid losses and ending reinsurance recoverable on unpaid losses includes amounts attributable to TPC Providers of $319.2 and $276.8.
(2) Amount represents a decrease in net loss and LAE reserves due to a change in the TPC Providers’ participation during 2021, related to the RITC for the 2018 year of account.
The following table summarizes the unpaid loss and LAE reserves, net of reinsurance recoverables on unpaid losses, for each of Ark’s major reserving lines of business as of December 31, 2021:



Millions		As of
December 31, 2021
Property and Accident & Health$175.0 
Marine & Energy99.3 
Specialty85.2 
Casualty - Active 37.4 
Casualty - Runoff68.4 
Other0.5
   Unpaid loss and LAE reserves, net of reinsurance recoverables on unpaid losses465.8 
Plus: Reinsurance recoverables on unpaid losses (1)
Property and Accident & Health145.2 
Marine & Energy70.2 
Specialty68.9 
Casualty - Active41.4 
Casualty - Runoff103.2 
   Total Reinsurance recoverables on unpaid losses (1)
428.9 
Total unpaid loss and LAE reserves$894.7 
(1) The reinsurance recoverables on unpaid losses include amounts attributable to TPC Providers of $276.8.
Schedule of Third Party Participation of LAE Reserves by Year of Account The following table summarizes the participation of Ark’s TPC Providers by year of account:
2012201320142015201620172018201920202021
TPC Providers’
   Participation		— %— %66.2 %70.0 %59.6 %60.0 %57.6 %58.3 %42.8 %— %
Short-duration Insurance Contracts, Claims Development
Property and Accident & Health
$ in Millions
Incurred Loss and LAE, Net of Reinsurance
For the Years Ended December 31,As of December 31, 2021
Accident Year2012201320142015201620172018201920202021
Total IBNR plus expected development on reported claims
Cumulative number of reported claims
Unaudited
2012$84.1 $68.4 $65.1 $65.7 $60.2 $60.0 $60.4 $60.2 $60.2 $60.0 $— 2,710
201374.6 66.9 66.6 62.1 61.6 61.7 61.6 61.6 61.6 .4 2,586
201434.8 31.3 29.4 28.6 28.6 28.5 28.5 28.5 — 2,963
201519.8 17.4 16.2 16.0 15.9 15.9 15.9 .4 2,884
201621.7 16.9 17.9 18.0 17.9 18.0 (.3)3,478
201722.6 29.9 37.4 36.7 36.0 3.6 4,610
201837.5 44.2 46.3 44.5 1.5 4,270
201930.4 27.8 23.4 2.1 4,073
202062.9 61.5 15.2 4,532
2021162.1 70.8 2,860
Total$511.5 

Property and Accident & Health
Millions
Cumulative Paid Loss and LAE, Net of Reinsurance
For the Years Ended December 31,
Accident Year2012201320142015201620172018201920202021
Unaudited
2012$14.2 $45.0 $53.6 $57.3 $58.2 $58.6 $58.7 $59.3 $59.4 $59.5 
201315.8 40.3 60.0 61.1 61.1 61.3 61.3 61.3 61.2 
201413.9 25.4 27.6 28.0 28.1 28.2 28.4 28.3 
20157.0 12.4 13.7 14.9 14.8 15.1 15.3 
20168.6 13.4 16.8 17.1 17.2 17.5 
201717.0 26.3 32.1 33.3 30.2 
201815.8 32.8 40.7 40.7 
20196.9 17.1 19.1 
202011.4 34.5 
202130.8 
Total337.1 
All outstanding liabilities before 2012, net of reinsurance
.6 
Loss and LAE reserves, net of reinsurance
$175.0 
Marine & Energy
$ in Millions
Incurred Loss and LAE, Net of Reinsurance
For the Years Ended December 31,As of December 31, 2021
Accident Year2012201320142015201620172018201920202021Total IBNR plus expected development on reported claimsCumulative number of reported claims
Unaudited
2012$64.7 $55.1 $46.0 $42.8 $33.6 $32.8 $32.6 $32.0 $32.0 $32.1 $.1 2,428 
201364.9 50.8 41.9 31.6 31.0 29.9 29.7 29.6 29.9 (.2)2,641 
201441.3 27.2 17.4 16.2 14.7 14.3 14.4 14.4 .5 2,581 
201525.3 15.4 13.6 12.7 12.0 12.0 12.2 .2 3,390 
201622.3 18.1 16.0 15.1 14.9 15.1 .7 4,117 
201723.9 18.6 16.9 16.4 16.5 1.1 4,470 
201824.5 18.9 16.7 17.0 .5 3,487 
201919.3 17.3 17.2 .6 2,562 
202024.4 21.7 2.9 1,668 
202183.7 69.9 1,091 
Total$259.8 

Marine & Energy
Millions
Cumulative Paid Loss and LAE, Net of Reinsurance
For the Years Ended December 31,
Accident Year2012201320142015201620172018201920202021
Unaudited
2012$8.1 $24.0 $27.4 $30.2 $30.6 $31.3 $31.7 $31.4 $31.3 $31.0 
20137.9 22.6 28.1 29.1 29.7 29.9 29.9 29.7 29.9 
20146.0 12.4 13.5 14.4 14.5 13.7 14.0 13.8 
20154.0 8.0 9.8 11.3 10.7 10.8 11.2 
20165.6 10.1 12.8 13.3 13.4 14.0 
20175.2 11.3 13.1 14.4 14.4 
20182.7 12.9 14.5 15.2 
20193.4 10.9 12.9 
20203.2 12.9 
20216.4 
Total161.7 
All outstanding liabilities before 2012, net of reinsurance1.2 
Loss and LAE reserves, net of reinsurance
$99.3 
Specialty
$ in Millions
Incurred Loss and LAE, Net of Reinsurance
For the Years Ended December 31,As of December 31, 2021
Accident Year2012201320142015201620172018201920202021Total IBNR plus expected development on reported claimsCumulative number of reported claims
Unaudited
2012$43.1 $36.1 $31.8 $30.8 $26.7 $25.8 $26.3 $26.6 $26.8 $26.8 $2.1 887
201348.6 34.9 25.6 17.5 16.9 17.1 16.9 17.3 17.3 1.3 1,122
201451.1 51.1 41.9 41.3 41.5 42.9 43.5 43.5 (.3)1,409
201521.3 13.0 10.4 10.1 10.6 10.7 10.8 1.7 1,876
201615.9 11.7 8.7 9.2 9.0 9.3 (1.3)1,941
201716.0 11.9 10.9 10.5 10.6 1.5 2,179
201812.1 13.9 14.8 13.7 2.4 2,090
201916.6 14.6 13.5 2.8 2,315
202020.7 19.7 6.2 1,925
202167.3 57.4 1,341
Total$232.5 

Specialty
Millions
Cumulative Paid Loss and LAE, Net of Reinsurance
For the Years Ended December 31,
Accident Year2012201320142015201620172018201920202021
Unaudited
2012$16.3 $25.2 $22.2 $22.6 $23.2 $23.3 $24.2 $24.4 $24.4 $24.5 
201317.1 13.6 15.2 15.8 15.8 16.0 16.0 16.0 16.0 
201426.8 39.7 40.4 40.8 41.5 42.8 43.6 43.5 
20154.1 7.2 7.8 8.2 8.2 8.3 8.3 
20163.2 8.0 9.2 10.0 10.4 10.5 
20173.3 6.8 8.4 8.5 8.5 
20182.9 8.1 9.8 10.3 
20194.9 7.1 7.6 
20205.4 10.9 
20215.2 
Total145.3 
All outstanding liabilities before 2012, net of reinsurance
(2.0)
Loss and LAE reserves, net of reinsurance
$85.2 
Casualty - Active
$ in Millions
Incurred Loss and LAE, Net of Reinsurance
For the Years Ended December 31,As of December 31, 2021
Accident Year2012201320142015201620172018201920202021Total IBNR plus expected development on reported claimsCumulative number of reported claims
Unaudited
2012$22.6 $21.1 $17.7 $16.2 $10.1 $9.9 $11.0 $11.0 $11.3 $11.1 $.8 1,016 
201323.2 18.8 15.0 8.3 8.1 8.9 8.8 9.0 8.9 1.3 1,134 
201417.1 13.8 7.5 7.0 8.0 7.8 7.8 7.7 1.2 1,359 
201512.3 7.7 6.0 7.0 6.5 6.4 6.2 .6 1,247 
20165.7 5.0 6.3 6.6 7.0 6.9 .1 1,483 
20177.4 7.8 7.2 6.2 5.9 .7 1,489 
20188.7 9.0 7.3 7.1 .9 961 
20198.0 7.4 6.3 1.7 742 
20207.6 6.2 3.9 420 
202115.9 14.2 452 
Total$82.2 

Casualty - Active
Millions
Cumulative Paid Loss and LAE, Net of Reinsurance
For the Years Ended December 31,
Accident Year2012201320142015201620172018201920202021
Unaudited
2012$1.3 $3.3 $4.8 $6.4 $7.4 $8.0 $8.5 $9.1 $8.9 $9.1 
20131.5 3.6 5.3 5.7 6.3 6.7 7.0 7.0 7.2 
20141.3 3.5 4.2 4.7 5.2 5.5 5.9 6.0 
20151.8 2.4 3.2 4.4 4.7 4.9 5.1 
2016.2 1.0 2.3 4.0 4.6 5.3 
2017.8 1.7 2.8 3.4 4.2 
2018.3 1.4 3.5 4.3 
2019.3 1.4 2.3 
2020.5 1.0 
2021.5 
Total45.0 
All outstanding liabilities before 2012, net of reinsurance
.2 
Loss and LAE reserves, net of reinsurance
$37.4 
Casualty - Runoff
$ in Millions
Incurred Loss and LAE, Net of Reinsurance
For the Years Ended December 31,As of December 31, 2021
Accident Year2012201320142015201620172018201920202021Total IBNR plus expected development on reported claimsCumulative number of reported claims
Unaudited
2012$44.3 $44.6 $37.8 $34.4 $22.3 $21.7 $22.3 $22.8 $22.7 $23.1 $(.2)1,430 
201365.7 75.8 70.1 49.2 47.0 49.8 49.8 49.8 49.9 3.1 1,810 
201446.9 67.5 46.8 46.0 55.9 55.6 56.0 55.0 1.9 1,932 
201526.9 23.9 26.4 35.7 33.0 33.2 32.0 1.4 2,009 
201619.1 25.3 38.8 35.4 35.3 34.1 3.8 2,141 
201717.4 27.2 26.7 28.0 26.7 2.5 1,597 
201813.5 18.2 20.2 20.0 2.9 1,265 
201910.8 14.3 15.4 3.7 961 
20204.2 6.0 3.6 552 
20211.7 .4 260 
Total263.9 

Casualty - Runoff
Millions
Cumulative Paid Loss and LAE, Net of Reinsurance
For the Years Ended December 31,
Accident Year2012201320142015201620172018201920202021
Unaudited
2012$3.5 $10.4 $13.6 $16.5 $17.8 $19.3 $20.5 $20.8 $21.2 $21.8 
20137.2 19.5 35.9 41.0 42.7 44.3 45.0 45.6 46.0 
20146.5 23.2 29.1 36.5 43.1 47.0 48.7 49.5 
20154.3 7.9 14.0 20.3 23.9 26.5 28.2 
20163.8 9.7 16.8 21.8 24.5 26.8 
20173.1 9.1 14.2 18.3 21.1 
20183.3 7.2 12.2 14.3 
20193.2 5.6 7.4 
2020.8 1.3 
2021.5 
Total216.9 
All outstanding liabilities before 2012, net of reinsurance
21.4 
Loss and LAE reserves, net of reinsurance
$68.4 
Short-duration Insurance Contracts, Schedule of Historical Claims Duration
Property and Accident & Health
Average Annual Percentage Payout of Incurred Losses and LAE by Age, Net of Reinsurance
Unaudited
Years12345678910
31.5%33.4%19.2%5.7%1.2%1.4%0.8%0.3%—%0.1%
Marine & Energy
Average Annual Percentage Payout of Incurred Losses and LAE by Age, Net of Reinsurance
Unaudited
Years12345678910
19.8%37.7%20.2%5.7%4.3%7.2%0.4%0.1%(0.4)%0.2%
Specialty
Average Annual Percentage Payout of Incurred Losses and LAE by Age, Net of Reinsurance
Unaudited
Years12345678910
34.0%33.8%7.3%0.5%4.6%4.4%4.6%3.1%(3.5)%(1.0)%
Casualty - Active
Average Annual Percentage Payout of Incurred Losses and LAE by Age, Net of Reinsurance
Unaudited
Years12345678910
9.1%14.7%18.5%14.2%9.6%10.7%3.9%3.1%1.0%3.1%
Casualty - Runoff
Average Annual Percentage Payout of Incurred Losses and LAE by Age, Net of Reinsurance
Unaudited
Years12345678910
9.4%15.3%17.0%15.9%9.7%8.1%7.0%3.6%2.5%1.7%