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Schedule IV - Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Life insurance in force |  |  |
Life insurance in force gross amount | $ 717,991.5 | $ 692,200.8 | $ 667,509.8
Life insurance in force ceded to other companies | 230,126.5 | 223,416.6 | 383,937.7
Life insurance in force assumed from other companies | 446.6 | 627.4 | 787.8
Life insurance in force net amount | $ 488,311.6 | $ 469,411.6 | $ 284,359.9
Life insurance in force, percentage of amount assumed to net (as a percent) | 0.10% | 0.10% | 0.30%
Premiums: |  |  |
Premiums gross amount | $ 6,961.3 | $ 5,795.1 | $ 5,490.6
Premiums ceded to other companies | 491.3 | 456.4 | 650.6
Premiums assumed from other companies | 0.9 | 1.0 | 1.5
Premiums net amount | 6,470.9 | 5,339.7 | 4,841.5
Life insurance and annuities |  |  |
Premiums: |  |  |
Premiums gross amount | 4,384.6 | 3,402.7 | 3,314.3
Premiums ceded to other companies | 335.1 | 298.6 | 494.9
Premiums assumed from other companies | 0.9 | 1.0 | 1.5
Premiums net amount | 4,050.4 | 3,105.1 | $ 2,820.9
Premiums percentage of amount assumed to net (as a percent) |  |  | 0.10%
Accident and health insurance |  |  |
Premiums: |  |  |
Premiums gross amount | 2,576.7 | 2,392.4 | $ 2,176.3
Premiums ceded to other companies | 156.2 | 157.8 | 155.7
Premiums net amount | $ 2,420.5 | $ 2,234.6 | $ 2,020.6

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- Definition Amount of life insurance issued and outstanding assumed from other entity, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 17 -Paragraph Column D -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 + Details
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- Definition Amount of life insurance issued and outstanding ceded to other entity, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 17 -Paragraph Column C -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column C)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 + Details
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- Definition Amount, before effect of reinsurance, of life insurance issued and outstanding, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 17 -Paragraph Column B -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 + Details
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- Definition Amount, after effect of reinsurance, of life insurance issued and outstanding, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 17 -Paragraph Column E -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 + Details
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- Definition Percentage of assumed life insurance contract issued and outstanding to life insurance contract issued and outstanding after effect of reinsurance, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 17 -Paragraph Column F -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column F)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-2 + Details
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