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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table |
Year | Summary Compensation Table Total for PEO(1) | Compensation Actually Paid to PEO(1)(2) | Average Summary Compensation Table Total for non-PEO Named Executive Officers(1) | Average Compensation Actually Paid to non-PEO Named Executive Officers(1)(2) | Value of Initial Fixed $100 Investment Based on: | Net Income (millions)(5) | Core ABV per Share(6)
Total Shareholder Return(3) | Peer Group Total Shareholder Return(4)
2024 | $14,933,252 | $25,665,738 | $4,538,512 | $5,886,320 | $202 | $185 | $392 | $170
2023 | $13,477,512 | $26,808,821 | $3,765,333 | $5,379,798 | $166 | $141 | $761 | $156
2022 | $13,606,009 | $28,885,520 | $3,662,609 | $6,060,272 | $135 | $125 | $137 | $142
2021 | $14,536,062 | $23,817,693 | $4,277,028 | $5,930,256 | $107 | $143 | $419 | $130
2020 | $10,876,524 | $4,540,198 | $3,346,954 | $2,208,833 | $66 | $105 | $368 | $115
Company Selected Measure Name | ABV per share |  |  |  |
Named Executive Officers, Footnote | The PEO for each year reported is Dominic J. Frederico. The non-PEO named executive officers for each year reported are as follows: •2024: Robert A. Bailenson, Ling Chow, Benjamin G. Rosenblum, Stephen Donnarumma •2023: Robert A. Bailenson, Ling Chow, Stephen Donnarumma, Holly Horn •2022: Robert A. Bailenson, Ling Chow, David A. Buzen, Stephen Donnarumma •2020 and 2021: Robert A. Bailenson, Ling Chow, David A. Buzen, Russell B. Brewer II |  |  |  |
Peer Group Issuers, Footnote | Represents the cumulative TSR of the Russell Midcap Index - Financials for the measurement period December 31, 2019 through December 31 of the year indicated. The Russell Midcap Index - Financials is the peer group used by our Company for purposes of Item 201(e) of Regulation S-K under the Securities Exchange Act of 1934, as amended (which we refer to as the Exchange Act), in our Annual Report on Form 10-K for the year ended December 31, 2024. |  |  |  |
PEO Total Compensation Amount | $ 14,933,252 | $ 13,477,512 | $ 13,606,009 | $ 14,536,062 | $ 10,876,524
PEO Actually Paid Compensation Amount | $ 25,665,738 | 26,808,821 | 28,885,520 | 23,817,693 | 4,540,198
Adjustment To PEO Compensation, Footnote | SEC rules require certain adjustments be made to the "Summary Compensation Table" totals to determine "compensation actually paid" as reported in the "Pay versus Performance Table" above. For purposes of the equity award adjustments shown below, no equity awards were cancelled due to a failure to meet vesting conditions. The following table details the applicable adjustments that were made to determine "compensation actually paid" (all amounts are averages for the non-PEO named executive officers, who we refer to as Other NEOs in the following table):
Year | Executive(s) | "Summary Compensation Table" Total | Deduct Share Award Included in "Summary Compensation Table" | Add Year-end Value of Unvested Equity Awards Granted in Year | Change in Value of Unvested Equity Awards Granted in Prior Years | Change in Value of Equity Awards Granted in Prior Years which Vested in Year | "Pay versus Performance Table" Compensation Actually Paid
2024 | PEO | $14,933,252 | $(9,995,624) | $6,540,597 | $10,842,696 | $3,344,817 | $25,665,738
Other NEOs | $4,538,512 | $(1,713,576) | $1,121,276 | $1,500,807 | $439,301 | $5,886,320
2023 | PEO | $13,477,512 | $(8,112,953) | $7,848,517 | $13,530,338 | $65,407 | $26,808,821
Other NEOs | $3,765,333 | $(1,195,033) | $1,156,084 | $1,645,336 | $8,078 | $5,379,798
2022 | PEO | $13,606,009 | $(8,661,779) | $7,576,157 | $13,873,696 | $2,491,437 | $28,885,520
Other NEOs | $3,662,609 | $(1,252,978) | $1,095,933 | $2,149,270 | $405,438 | $6,060,272
2021 | PEO | $14,536,062 | $(9,239,643) | $10,089,728 | $6,588,781 | $1,842,765 | $23,817,693
Other NEOs | $4,277,028 | $(1,658,182) | $1,810,742 | $1,168,687 | $331,981 | $5,930,256
2020 | PEO | $10,876,524 | $(5,964,855) | $5,368,531 | $(5,219,036) | $(520,966) | $4,540,198
Other NEOs | $3,346,954 | $(1,005,208) | $904,717 | $(956,798) | $(80,832) | $2,208,833
Non-PEO NEO Average Total Compensation Amount | $ 4,538,512 | 3,765,333 | 3,662,609 | 4,277,028 | 3,346,954
Non-PEO NEO Average Compensation Actually Paid Amount | $ 5,886,320 | 5,379,798 | 6,060,272 | 5,930,256 | 2,208,833
Adjustment to Non-PEO NEO Compensation Footnote | SEC rules require certain adjustments be made to the "Summary Compensation Table" totals to determine "compensation actually paid" as reported in the "Pay versus Performance Table" above. For purposes of the equity award adjustments shown below, no equity awards were cancelled due to a failure to meet vesting conditions. The following table details the applicable adjustments that were made to determine "compensation actually paid" (all amounts are averages for the non-PEO named executive officers, who we refer to as Other NEOs in the following table):
Year | Executive(s) | "Summary Compensation Table" Total | Deduct Share Award Included in "Summary Compensation Table" | Add Year-end Value of Unvested Equity Awards Granted in Year | Change in Value of Unvested Equity Awards Granted in Prior Years | Change in Value of Equity Awards Granted in Prior Years which Vested in Year | "Pay versus Performance Table" Compensation Actually Paid
2024 | PEO | $14,933,252 | $(9,995,624) | $6,540,597 | $10,842,696 | $3,344,817 | $25,665,738
Other NEOs | $4,538,512 | $(1,713,576) | $1,121,276 | $1,500,807 | $439,301 | $5,886,320
2023 | PEO | $13,477,512 | $(8,112,953) | $7,848,517 | $13,530,338 | $65,407 | $26,808,821
Other NEOs | $3,765,333 | $(1,195,033) | $1,156,084 | $1,645,336 | $8,078 | $5,379,798
2022 | PEO | $13,606,009 | $(8,661,779) | $7,576,157 | $13,873,696 | $2,491,437 | $28,885,520
Other NEOs | $3,662,609 | $(1,252,978) | $1,095,933 | $2,149,270 | $405,438 | $6,060,272
2021 | PEO | $14,536,062 | $(9,239,643) | $10,089,728 | $6,588,781 | $1,842,765 | $23,817,693
Other NEOs | $4,277,028 | $(1,658,182) | $1,810,742 | $1,168,687 | $331,981 | $5,930,256
2020 | PEO | $10,876,524 | $(5,964,855) | $5,368,531 | $(5,219,036) | $(520,966) | $4,540,198
Other NEOs | $3,346,954 | $(1,005,208) | $904,717 | $(956,798) | $(80,832) | $2,208,833
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure | The following graphs show the relationship between executive compensation actually paid and, respectively, Core ABV per share, TSR, and net income, as well as the relationship between TSR and peer group TSR. |  |  |  |
Tabular List, Table | •Core ABV per share •Core Operating income per diluted share •Core Operating ROE •Core Operating shareholders’ equity per share •PVP •Relative TSR |  |  |  |
Total Shareholder Return Amount | $ 202 | 166 | 135 | 107 | 66
Peer Group Total Shareholder Return Amount | 185 | 141 | 125 | 143 | 105
Net Income (Loss) | $ 392,000,000 | $ 761,000,000 | $ 137,000,000 | $ 419,000,000 | $ 368,000,000
Company Selected Measure Amount | 170 | 156 | 142 | 130 | 115
PEO Name | Dominic J. Frederico |  |  |  |
Additional 402(v) Disclosure | Represents our Company's cumulative TSR for the measurement period December 31, 2019 through December 31 of the year indicated.Represents "Net Income (loss)" in our Company's Consolidated Income Statements included in our Annual Report on Form 10-K for each of the years ended December 31, 2024, 2023, 2022, 2021 and 2020. Given the methodology for calculating compensation actually paid and the large component of multi-year equity awards in our executive compensation program, the movement of the price of our Common Shares over the relevant year has a large impact on the calculation of compensation actually paid to our CEO and our other named executive officers as a group during that year. Additionally, we provide our CEO and our other named executive officers their short-term and long-term incentive awards in the February following the year for which their performance is measured in making those awards, further obscuring any relationship between the performance measures and calculated compensation actually paid in the graphs above. Core ABV per share is a measure of the intrinsic value of our Company on a per share basis, so an increase in Core ABV per share reflects the building of value for our shareholders. TSR captures the view of the equity markets to our efforts. The graphs above demonstrate some correlation between these measures and the calculated compensation actually paid. On the other hand, as described in the Compensation Discussion and Analysis — Executive Compensation Program Structure and Process, the nature of the accounting model for the financial guaranty business, where only approximately 5% of the premiums we earned in 2024 related to new financial guaranty policies we wrote in 2024, shows how little impact activity in our core insurance business has on our net income in a given year, and the graph above demonstrates little correlation between net income and calculated compensation actually paid. |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Core ABV per share |  |  |  |
Non-GAAP Measure Description | Our Company-selected measure is Core ABV per share, which is described below. |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Core Operating income per diluted share |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Core Operating ROE |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Core Operating shareholders’ equity per share |  |  |  |
Measure:: 5 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | PVP |  |  |  |
Measure:: 6 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Relative TSR |  |  |  |
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (9,995,624) | $ (8,112,953) | $ (8,661,779) | $ (9,239,643) | $ (5,964,855)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 6,540,597 | 7,848,517 | 7,576,157 | 10,089,728 | 5,368,531
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 10,842,696 | 13,530,338 | 13,873,696 | 6,588,781 | (5,219,036)
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 3,344,817 | 65,407 | 2,491,437 | 1,842,765 | (520,966)
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (1,713,576) | (1,195,033) | (1,252,978) | (1,658,182) | (1,005,208)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 1,121,276 | 1,156,084 | 1,095,933 | 1,810,742 | 904,717
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 1,500,807 | 1,645,336 | 2,149,270 | 1,168,687 | (956,798)
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ 439,301 | $ 8,078 | $ 405,438 | $ 331,981 | $ (80,832)

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