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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 |  |  |
Gross Amount | $ 40,422.9 | $ 38,564.6 | $ 21,032.6
Ceded to Other Companies | 9,597.7 | 9,330.9 | 4,693.5
Assumed from Other Companies | 0.0 | 0.0 | 0.0
Net Amount | $ 30,825.2 | $ 29,233.7 | $ 16,339.1
Percentage of Amount Assumed to Net | 0.00% | 0.00% | 0.00%
Premiums |  |  |
Gross Amount | $ 1,097.6 | $ 1,046.7 | $ 912.4
Ceded to Other Companies | 76.3 | 72.0 | 33.3
Assumed from Other Companies | 35.8 | 53.0 | 9.7
Net Amount | $ 1,057.1 | $ 1,027.7 | $ 888.8
Percentage of Amount Assumed to Net | 3.40% | 5.20% | 1.10%
Property & Casualty |  |  |
Premiums |  |  |
Gross Amount | $ 653.0 | $ 614.7 | $ 623.0
Ceded to Other Companies | 18.1 | 15.0 | 15.3
Assumed from Other Companies | 10.7 | 8.5 | 9.7
Net Amount | $ 645.6 | $ 608.2 | $ 617.4
Percentage of Amount Assumed to Net | 1.70% | 1.40% | 1.60%
Life & Retirement |  |  |
Premiums |  |  |
Gross Amount | $ 166.5 | $ 158.9 | $ 159.5
Ceded to Other Companies | 14.8 | 14.9 | 16.1
Assumed from Other Companies | 0.0 | 0.0 | 0.0
Net Amount | $ 151.7 | $ 144.0 | $ 143.4
Percentage of Amount Assumed to Net | 0.00% | 0.00% | 0.00%
Supplemental & Group Benefits |  |  |
Premiums |  |  |
Gross Amount | $ 278.1 | $ 273.1 | $ 129.9
Ceded to Other Companies | 43.4 | 42.1 | 1.9
Assumed from Other Companies | 25.1 | 44.5 | 0.0
Net Amount | $ 259.8 | $ 275.5 | $ 128.0
Percentage of Amount Assumed to Net | 9.70% | 16.20% | 0.00%

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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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