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Reserve for Losses and Loss Adjustment Expenses
 9 Months Ended
Sep. 30, 2021
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]  
Reserve for losses and loss adjustment expenses Reserve for Losses and Loss Adjustment Expenses
The following table represents an analysis of losses and loss adjustment expenses and a reconciliation of the beginning and ending reserve for losses and loss adjustment expenses:
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Reserve for losses and loss adjustment expenses at beginning of period
$17,196,648 $15,044,874 $16,513,929 $13,891,842 
Unpaid losses and loss adjustment expenses recoverable
4,146,020 4,156,157 4,314,855 4,082,650 
Net reserve for losses and loss adjustment expenses at beginning of period
13,050,628 10,888,717 12,199,074 9,809,192 
Net incurred losses and loss adjustment expenses relating to losses occurring in:
Current year
1,348,528 1,264,315 3,812,381 3,673,346 
Prior years
(122,509)(48,042)(223,431)(111,132)
Total net incurred losses and loss adjustment expenses
1,226,019 1,216,273 3,588,950 3,562,214 
Net losses and loss adjustment expense reserves of acquired business (2)104,307 — 104,307 $— 
Retroactive reinsurance transactions (1)
— — (183,893)60,635 
Impact of deconsolidation of Watford (3)(1,460,611)— (1,460,611)— 
Net foreign exchange (gains) losses
(78,152)114,122 10,818 22,706 
Net paid losses and loss adjustment expenses relating to losses occurring in:
Current year
(208,923)(189,961)(432,348)(359,395)
Prior years
(417,368)(512,263)(1,610,397)(1,578,464)
Total net paid losses and loss adjustment expenses
(626,291)(702,224)(2,042,745)(1,937,859)
Net reserve for losses and loss adjustment expenses at end of period
12,215,900 11,516,888 12,215,900 11,516,888 
Unpaid losses and loss adjustment expenses recoverable
5,115,147 4,383,638 5,115,147 4,383,638 
Reserve for losses and loss adjustment expenses at end of period
$17,331,047 $15,900,526 $17,331,047 $15,900,526 
(1)     During the 2021 first quarter, the Company entered into a reinsurance to close and other related agreements with Premia Managing Agency Limited (“Premia”), in connection with the 2018 and prior years of account related to the acquisition of Barbican Group Holdings Limited (“Barbican”). During the 2020 first quarter, the Company entered into a reinsurance to close agreement of the 2017 and prior years of account previously covered by a third party arrangement.
(2)    Represents activity related to the Company’s acquisitions in the 2021 period. See note 2.
(3)    See note 12.

Development on Prior Year Loss Reserves

2021 Third Quarter

During the 2021 third quarter, the Company recorded net favorable development on prior year loss reserves of $122.5 million, which consisted of $5.1 million from the insurance segment, $72.3 million from the reinsurance segment and $45.1 million from the mortgage segment.
The insurance segment’s net favorable development of $5.1 million, or 0.5 loss ratio points, for the 2021 third quarter consisted of $49.0 million of net favorable development in short-tailed and long-tailed lines and $43.9 million of net adverse development in medium-tailed lines. Net favorable development in short-tailed lines reflected $5.4 million of
favorable development in lenders products, primarily from the 2020 accident year (i.e., the year in which a loss occurred), $5.4 million of favorable development from property (excluding marine), primarily from the 2020 accident year, and $5.1 million of favorable development in travel and accident, across most accident years. Net favorable development in long-tailed lines reflected $26.3 million of favorable development related to construction and national accounts, across most accident years, and $6.7 million of favorable development related to other business, including alternative markets, primarily from the 2015 to 2018 accident years. Net adverse development in medium-tailed lines included $37.0 million of adverse development in contract binding business, across most accident years, partially offset by favorable development in marine and programs, primarily from more recent accident years.
The reinsurance segment’s net favorable development of $72.3 million, or 10.7 loss ratio points, for the 2021 third quarter consisted of $65.4 million of net favorable development in short-tailed lines and $6.9 million in medium-tailed and long-tailed lines. Net favorable development in short-tailed lines reflected $46.1 million of favorable development related to property catastrophe and property other than property catastrophe business, primarily from the 2017 to 2020 underwriting years (i.e., all premiums and losses attributable to contracts having an inception or renewal date within the given twelve-month period) and $18.9 million of favorable development related to other specialty, primarily from the 2012 to 2017 underwriting years. Net favorable development in medium-tailed and long-tailed lines included $4.7 million of favorable development in casualty, primarily from the 2013 and 2014 underwriting years.
The mortgage segment’s net favorable development was $45.1 million, or 14.5 loss ratio points, for the 2021 third quarter, about half of which came from U.S. primary mortgage insurance, from better than expected cure activity in pre-pandemic delinquencies and recoveries on second lien and student loans, and the other half from our CRT portfolio and international mortgage insurance.
2020 Third Quarter
During the 2020 third quarter, the Company recorded net favorable development on prior year loss reserves of $48.0 million, which consisted of $2.3 million from the insurance segment, $42.0 million from the reinsurance segment and $4.5 million from the mortgage segment, partially offset by $0.7 million unfavorable from the ‘other’ segment.
The insurance segment’s net favorable development of $2.3 million, or 0.3 loss ratio points, for the 2020 third quarter consisted of $12.9 million of net favorable development in short-tailed and long-tailed lines and $10.6 million of net adverse development in medium-tailed lines. Net favorable development of $11.8 million in short-tailed lines reflected $8.0 million of favorable development from property (excluding marine), primarily from the 2015 to 2018 accident years and $3.4 million of favorable development in travel and accident, primarily from the 2019 accident year. Net favorable development of $1.1 million in long-tailed lines reflected $8.7 million of favorable development in construction and national accounts, primarily from the 2018 accident year, and $4.2 million of favorable development related to other business, including alternative markets and excess workers’ compensation, primarily from the 2013 to 2017 accident years, partially offset by $11.7 million of adverse development in executive assurance and casualty, primarily from the 2015 and 2019 accident year. Net adverse development in medium-tailed lines included $7.1 million of adverse development in program business, primarily from
2015 to 2018 accident years and $3.7 million of adverse development in contract binding, across all accident years.
The reinsurance segment’s net favorable development of $42.0 million, or 7.6 loss ratio points, for the 2020 third quarter consisted of $45.6 million of net favorable development in short-tailed and medium-tailed lines and net adverse development of $3.6 million from long-tailed lines. Net favorable development in short-tailed lines reflected $27.6 million of favorable development related to property catastrophe and property other than property catastrophe business, primarily from the 2016 to 2019 underwriting years and $7.8 million of favorable development from other specialty, primarily from the 2016 to 2019 underwriting years. Net favorable development of $9.4 million in medium-tailed lines reflected favorable development in marine and aviation across most underwriting years. Adverse development of $3.6 million in long-tailed lines reflected an increase in reserves from casualty, primarily from the 2012 to 2019 underwriting years.
The mortgage segment’s net favorable development was $4.5 million, or 1.3 loss ratio points, for the 2020 third quarter, primarily driven by subrogation recoveries on second lien and student loan business.
Nine Months Ended September 30, 2021
During the nine months ended September 30, 2021, the Company recorded net favorable development on prior year loss reserves of $223.4 million, which consisted of $13.1 million from the insurance segment, $119.6 million from the reinsurance segment and $99.1 million from the mortgage segment, partially offset by $8.4 million of adverse development from the ‘other’ segment (activity for the six months ended June 30, 2021 prior to deconsolidation of Watford).
The insurance segment’s net favorable development of $13.1 million, or 0.5 loss ratio points, for the 2021 period consisted of $102.5 million of net favorable development in short-tailed and long-tailed lines, partially offset by $89.4 million of net adverse development in medium-tailed lines. Net favorable development of $65.3 million in short-tailed lines reflected $27.0 million of favorable development from property (excluding marine), primarily from the 2019 and 2020 accident years, $24.0 million of favorable development in lenders products, primarily from the 2020 accident year, and $14.4 million of favorable development in travel and accident, primarily from the 2017 to 2020 accident years. Net favorable development of $37.1 million in long-tailed lines included favorable development primarily related to construction, national accounts and alternative markets, primarily from the 2016 to 2019 accident years. Net adverse development in medium-tailed lines reflected $57.1 million of adverse development in contract binding business, primarily from the 2014 to 2019 accident years, $26.2 million of adverse development in professional liability business,
primarily from the 2019 and 2020 accident years, and $6.9 million of adverse development in programs business, primarily from the 2019 accident year.
The reinsurance segment’s net favorable development of $119.6 million, or 5.8 loss ratio points, for the 2021 period consisted of $139.7 million of net favorable development from short-tailed and medium-tailed lines, partially offset by $20.1 million of net adverse development from long-tailed lines. Net favorable development of $132.6 million in short-tailed lines reflected $97.1 million of favorable development from other specialty lines, primarily from the 2016 to 2019 underwriting years, and $71.7 million of favorable development from property other than property catastrophe business, primarily from the 2017 to 2020 underwriting years. Such amounts were partially offset by adverse development of $36.3 million from property catastrophe, primarily from the 2020 underwriting year. Adverse development in long-tailed lines reflected an increase in reserves from casualty, primarily from the 2018 underwriting year.
The mortgage segment’s net favorable development was $99.1 million, or 10.1 loss ratio points, for the 2021 period, which included reserve releases associated with various vintage credit risk transfer contracts that were called by the GSEs, favorable development on U.S. and international business and subrogation recoveries on second lien and student loan business.
Nine Months Ended September 30, 2020
During the nine months ended September 30, 2020, the Company recorded net favorable development on prior year loss reserves of $111.1 million, which consisted of $5.9 million from the insurance segment, $93.8 million from the reinsurance segment, $10.8 million from the mortgage segment and $0.6 million from the ‘other’ segment.
The insurance segment’s net favorable development of $5.9 million, or 0.3 loss ratio points, for the 2020 period consisted of $41.6 million of net favorable development in short-tailed and long-tailed lines, partially offset by $35.7 million of net adverse development in medium-tailed lines. Net favorable development of $27.2 million in short-tailed lines reflected $17.5 million of favorable development from property (excluding marine), primarily from the 2015 to 2018 accident years, $6.2 million of favorable development on travel and accident, primarily from 2019 accident year, and $3.5 million of favorable development in lenders products, primarily from the 2018 and 2019 accident years. Net favorable development of $14.4 million in long-tailed lines included $11.7 million of favorable development related to other business, including alternative markets and excess workers’ compensation, primarily from the 2013 to 2017 accident years. Net adverse development in medium-tailed lines reflected $23.0 million of adverse development in contract binding business, across all accident years, and $13.5 million of adverse development
in program business, primarily from the 2016 to 2018 accident years.
The reinsurance segment’s net favorable development of $93.8 million, or 5.9 loss ratio points, for the 2020 period consisted of $113.0 million of net favorable development from short-tailed and medium-tailed lines, partially offset by $19.2 million of net adverse development from long-tailed lines. Net favorable development of $101.8 million in short-tailed lines reflected $52.1 million related to property catastrophe and property other than property catastrophe business, primarily from the 2016 to 2019 underwriting years, and $47.1 million from other specialty lines, across most underwriting years. Adverse development in long-tailed lines of $19.2 million reflected an increase in reserves from casualty, primarily from the 2012 to 2015 underwriting years.
The mortgage segment’s net favorable development was $10.8 million, or 1.0 loss ratio points, for the 2020 period, primarily driven by subrogation recoveries on second lien and student loan business.