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Investments in Fixed Maturity Securities (AFS Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | $ 44,248 | $ 33,278 | $ 37,352 | $ 22,238
Cumulative effect adjustment resulting from changes in accounting principles | 46,364 | 34,595 | 46,364 | 34,595
Expected credit losses on securities for which credit losses were not previously recorded | 2,482 | 1,044 | 4,973 | 3,123
Expected credit losses (gains) on securities for which credit losses were previously recorded | (366) | 273 | 4,046 | 9,267
Reduction due to disposals |  |  | (7) | (33)
Allowance for expected credit losses, end of period | 46,364 | 34,595 | 46,364 | 34,595
Foreign government |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 33,052 | 33,096 | 32,633 | 22,222
Cumulative effect adjustment resulting from changes in accounting principles | 36,171 | 33,375 | 36,171 | 33,375
Expected credit losses on securities for which credit losses were not previously recorded | 0 | 0 | 0 | 1,897
Expected credit losses (gains) on securities for which credit losses were previously recorded | 3,119 | 279 | 3,538 | 9,289
Reduction due to disposals |  |  | 0 | (33)
Allowance for expected credit losses, end of period | 36,171 | 33,375 | 36,171 | 33,375
Corporate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 8,867 | 182 | 4,701 | 16
Cumulative effect adjustment resulting from changes in accounting principles | 5,770 | 1,199 | 5,770 | 1,199
Expected credit losses on securities for which credit losses were not previously recorded | 756 | 1,023 | 942 | 1,205
Expected credit losses (gains) on securities for which credit losses were previously recorded | (3,853) | (6) | 134 | (22)
Reduction due to disposals |  |  | (7) | 0
Allowance for expected credit losses, end of period | 5,770 | 1,199 | 5,770 | 1,199
Mortgage-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 885 | 0 | 18 | 0
Cumulative effect adjustment resulting from changes in accounting principles | 2,100 | 21 | 2,100 | 21
Expected credit losses on securities for which credit losses were not previously recorded | 905 | 21 | 1,766 | 21
Expected credit losses (gains) on securities for which credit losses were previously recorded | 310 | 0 | 316 | 0
Reduction due to disposals |  |  | 0 | 0
Allowance for expected credit losses, end of period | 2,100 | $ 21 | 2,100 | $ 21
Asset-backed |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 1,444 |  | 0 |
Cumulative effect adjustment resulting from changes in accounting principles | 1,502 |  | 1,502 |
Expected credit losses on securities for which credit losses were not previously recorded | 0 |  | 1,444 |
Expected credit losses (gains) on securities for which credit losses were previously recorded | 58 |  | 58 |
Reduction due to disposals |  |  | 0 |
Allowance for expected credit losses, end of period | 1,502 |  | 1,502 |
State and municipal |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance for expected credit losses, beginning of period | 0 |  | 0 |
Cumulative effect adjustment resulting from changes in accounting principles | 821 |  | 821 |
Expected credit losses on securities for which credit losses were not previously recorded | 821 |  | 821 |
Expected credit losses (gains) on securities for which credit losses were previously recorded | 0 |  | 0 |
Reduction due to disposals |  |  | 0 |
Allowance for expected credit losses, end of period | $ 821 |  | $ 821 |

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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