Non-GAAP operating income (loss) is net earnings attributable to Enstar ordinary shareholders excluding: (i) net realized and unrealized (gains) losses on fixed maturity investments and funds held - directly managed included in net earnings (loss); (ii) change in fair value of insurance contracts for which we have elected the fair value option; (iii) gain (loss) on sale of subsidiaries, if any; (iv) net earnings (loss) from discontinued operations, if any; (v) tax effect of these adjustments, where applicable; and (vi) attribution of share of adjustments to noncontrolling interest, where applicable. We eliminate the impact of net realized and unrealized (gains) losses on fixed maturity investments and funds held - directly managed and change in fair value of insurance contracts for which we have elected the fair value option because these items are subject to significant fluctuations in fair value from period to period, driven primarily by market conditions and general economic conditions, and therefore their impact on our earnings is not reflective of the performance of our core operations. We eliminate the impact of gain (loss) on sale of subsidiaries and net earnings (loss) on discontinued operations because these are not reflective of the performance of our core operations. Diluted Non-GAAP operating income (loss) per ordinary share is diluted net earnings per ordinary share excluding the per diluted share amounts of each of the adjustments used to calculate non-GAAP operating income.
•Total gross and net reserves for losses and LAE of $10.6 billion and $8.5 billion, respectively. During 2020, our Non-life Run-off segment assumed and ceded net reserves of $2.2 billion and $154.9 million, respectively.
•An increase in net realized and unrealized gains of $659.2 million. Net realized and unrealized gains in 2020 were driven by an increase in the valuation of our other investments, predominantly in a hedge fund in the current period as discussed below in the "Investment Results - Consolidated" section;
Workers' Compensation - A $136.4 million reduction in estimates of net ultimate losses in our workers' compensation line of business arose across multiple portfolios, where reported loss development was generally significantly less than expected development. The lower than expected actual development was driven by significant proactive settlement activity on individual claimants where we were able to settle claims lower than the case reserve estimates. For example, in two of our portfolios we observed favorable reported loss development, where we paid $39.3 million in loss payments to release a corresponding $53.6 million of associated case reserves resulting in $14.3 million in favorable reported loss development. These settlement activities and the favorable actual loss development versus expected loss development, led to a change in the actuarial assumptions in the annual reserve study that reflect this favorable loss development.
The following table provides gross premiums written by line of business for the Atrium segment.
The following is a discussion and analysis of the results of operations for the StarStone segment. Current and prior period results are not indicative of future results.
2019 versus 2018: Net losses attributable to the StarStone segment decreased by $57.8 million, primarily due to a reduction in underwriting losses due to the underwriting remediation and a higher investment return, partially offset by higher corporate expenses in 2019.
The following table summarizes the exit costs associated with the StarStone International Run-Off.
For information regarding our investment strategy, refer to "Item 1. Business - Investments."
•comparing assumptions for loss development factors and expected trends in claim frequency and severity to historical results and industry trends
In addition, our other activities, which do not qualify as a reportable segment, include our corporate expenses, debt servicing costs, preferred share dividends, holding company income and expenses, foreign exchange and other miscellaneous items.
The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP"). The consolidated financial statements include our assets, liabilities and results of operations as of December 31, 2020 and 2019 and for the years ended December 31, 2020, 2019 and 2018. Results of operations for acquired subsidiaries are included from the date of acquisition. All significant intercompany transactions and balances have been eliminated. Certain prior period amounts have been reclassified to conform to the current period presentation as described in further detail in Note 5 - "Divestitures, Held-for-Sale Businesses and Discontinued Operations." These reclassifications had no impact on net earnings.
•Net change in IBNR reserves: the change in IBNR reserves, net of related reinsurance recoveries.
•Increase (reduction) in provisions for unallocated LAE: the net change in our provision for unallocated LAE.
On an ongoing basis, we also evaluate and monitor the financial condition of our reinsurers under voluntary schemes of arrangement to minimize our exposure to significant losses from potential insolvencies.
As discussed above and below, with effect from January 1, 2020, we adopted the new credit losses standard which replaced the OTTI model that was previously applicable to our AFS debt securities. The new approach now requires the recognition of impairment charges relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. A description of our historical OTTI process which was in place prior to our adoption of the new credit losses standard and which applied to our comparative financial statements is provided below.
We hold investments in publicly traded equities and exchange-traded funds as well as in privately held equities. Our equity investments are carried at fair value with realized and unrealized gains and losses included in net earnings and reported as net realized and unrealized gains and losses.
Other investments include investments in limited partnerships and limited liability companies (collectively "private equities") and fixed income funds, hedge funds, equity funds, private credit funds and collateralized loan obligation ("CLO") equity funds that carry their investments at fair value, as well as direct investments in CLO equities. These other investments are stated at fair value, which ordinarily will be the most recently reported net asset value as advised by the fund manager or administrator. Many of our fund investments publish net asset values on a daily basis and provide daily liquidity while others report on a monthly or quarterly basis. The change in fair value is included in net realized and unrealized gains and losses on investments and recognized in net earnings.
Under the provisions of ASU 2020-04, entities can elect not to apply certain modification accounting requirements to contracts affected by reference rate reform, if certain criteria are met. An entity that makes this election would not have to remeasure the contracts at the modification date or reassess a previous accounting determination. Entities can also elect various optional expedients for hedging relationships affected by reference rate reform, if certain criteria are met. Once elected, the amendments in this guidance must be applied prospectively for all eligible contract modifications.
On November 30, 2020, we completed the sale and recapitalization of StarStone U.S. through the sale of StarStone U.S. to Core Specialty, a newly formed entity with equity backing from funds managed by SkyKnight Capital, L.P., Dragoneer Investment Group and Aquiline Capital Partners LLC.
Following the completion of the sale of StarStone U.S. to Core Specialty on November 30, 2020, our continuing involvement with StarStone U.S comprised of the following transactions:
(1) For the year ended December 31, 2020, negative total expenses were driven by favorable loss development on the losses and LAE reserves ceded by StarStone U.S. to our subsidiaries.
(1) The Company adopted ASU 2016-13 and the related amendments on January 1, 2020. Refer to Note 1 - "Significant Accounting Policies" for further details.
•Corporate and Government: Expected cashflows are derived that are specific to each security. The PD is based on a quantitative model that converts agency ratings to term structures that vary by country, industry and the state of the credit cycle. This is used along with macroeconomic forecasts to produce scenario conditioned PDs. The LGD is based on default studies provided by a third party which we use along with macroeconomic forecasts to produce scenario conditioned LGDs.
The liability for losses and loss adjustment expenses ("LAE"), also referred to as loss reserves, represents our gross estimates before reinsurance for unpaid reported losses and includes losses that have been incurred but not reported ("IBNR") for our Non-life Run-off, Atrium (classified as held-for-sale as of December 31, 2020) and StarStone segments using a variety of actuarial methods. We recognize an asset for the portion of the liability that we expect to recover from reinsurers. LAE reserves include allocated loss adjustment expenses ("ALAE"), and unallocated loss adjustment expenses ("ULAE"). ALAE are linked to the settlement of an individual claim or loss, whereas ULAE are based on our estimates of future costs to administer the claims. IBNR represents reserves for loss and LAE that have been incurred but not yet reported to us. This includes amounts for unreported claims, development on known claims and reopened claims.
(1) The Company adopted ASU 2016-13 and the related amendments on January 1, 2020. Refer to Note 2 - "Significant Accounting Policies" for further details. This amount excludes $0.4 million related to the adoption impact of ASU 2016-13 on StarStone U.S., which has been classified as a discontinued operation with the related assets and liabilities disclosed as held-for-sale on our consolidated balance sheets.
•StarStone - The average annual percentage payout disclosures for our StarStone segment are based on the payout of incurred claims by age, net of reinsurance.
Other significant components of the 2020 net incurred losses and LAE include losses related to 2020 net earned premium of $30.2 million, an increase in the fair value of liabilities of $119.0 million related to our assumed retroactive reinsurance agreements for which we have elected the fair value option, primarily due to narrowing credit spreads on corporate bond yields in 2020 and 15 commutations in lines other than workers’ compensation resulting in a decrease of $12.3 million.
(4) Relates to the amortization of fair value adjustments associated with the acquisition of companies.
We have a liability for defendant environmental liabilities of $12.6 million and $10.3 million as of December 31, 2020 and 2019, respectively. The estimate for defendant environmental liabilities is based on information available to us, including an estimate of the allocation of liability among PRPs, the probability that other PRPs will pay the cost apportioned to them, currently available information from PRPs and/or federal or state environmental agencies concerning the scope of contamination and estimated remediation and consulting costs, and remediation alternatives.
Gross premiums written for the year ended December 31, 2020 decreased by $106.7 million primarily due to StarStone International being placed into an orderly run-off, whereas gross premiums written for the year ended December 31, 2019 decreased by $158.9 million primarily due to StarStone's strategy to exit certain lines of business.
We have issued two series of Senior Notes as shown in the table above. The Senior Notes are effectively subordinated to any of our secured indebtedness to the extent of the value of the assets securing such indebtedness, and structurally subordinated to all liabilities of our subsidiaries, including claims of policyholders. The 2022 Senior Notes and the 2029 Senior Notes bear interest at a fixed rate per annum, equal to 4.50% and 4.95%, respectively.
From inception to December 31, 2020, we repurchased 178,280 ordinary shares at an average price of 145.87, for an aggregate price of $26.0 million under the Repurchase Program. As of December 31, 2020, the remaining capacity under the Repurchase Program was $124.0 million. We did not repurchase any shares subsequent to December 31, 2020.
On May 14, 2018, 1,501,778 Voting Ordinary Shares were issued as consideration for the acquisition of KaylaRe Holdings Ltd, as described in Note 3 - "Business Acquisitions".
For each type of PSU based on FDBVPS, a change in the FDBVPS Performance Criteria at each of Threshold, Target and Maximum will result in the application of the respective Threshold, Target and Maximum Performance Multiplier and a settlement of awards at that level. In addition, for the 2020 FDBVPS Type II award, a change in the FDBVPS Performance Criteria at "Target +" will result in the application of the "Target +" Performance Multiplier. Straight-line interpolation applies within these ranges, and no settlement occurs if the increase in FDBVPS is less than the Threshold.
The following table presents our current and deferred income tax expense (benefit) attributable to continuing operations by jurisdiction for the years ended December 31, 2020, 2019 and 2018:
On December 15, 2016, KaylaRe completed an initial capital raise of $620.0 million. We originally owned 48.2% of KaylaRe's common shares and recorded our investment in KaylaRe using the equity method basis of accounting, pursuant to the conclusion that we were not required to consolidate following an analysis based on the guidance in ASC 810 - Consolidation.
Our ability to pay dividends to our shareholders is dependent upon the ability of our (re)insurance subsidiaries to distribute capital and pay dividends to us. Our (re)insurance subsidiaries are subject to certain regulatory restrictions on the distribution of capital and payment of dividends in the jurisdictions in which they operate, as described below. The restrictions are generally based on net income or levels of capital and surplus as determined in accordance with the relevant statutory accounting practices. Failure of these subsidiaries to meet their applicable regulatory requirements could result in restrictions on any distributions of capital or retained earnings or stricter regulatory oversight of the subsidiaries.
As of December 31, 2020, we had unfunded commitments of $975.5 million to other investments, $68.7 million to equity method investments and $5.0 million to fixed maturity investments.
(2) Sub-lease income consists of rental income received from third parties to whom we have sub-leased some of our leased office spaces and is included within other income in our consolidated statements of earnings.
Lease expense for the year ended December 31, 2018 was $11.3 million, relating to office space and facilities that we leased to conduct our business operations.
The following tables set forth selected and consolidated statement of earnings results by segment for the years ended December 31, 2020, 2019, and 2018: