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Reinsurance and Catastrophes (Tables) | 12 Months Ended
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Dec. 31, 2023
Insurance [Abstract] |
Summary of Reinsurance Recoverable on Unpaid Insurance Reserves | The total amounts of reinsurance recoverable on unpaid insurance reserves classified as assets and included in the amounts being reported as Reinsurance balances receivable in the Consolidated Balance Sheets were as follows:
($ in millions) |  | December 31,
|  | 2023 |  | 2022
Reinsurance recoverables on reserves and unpaid claims |  |  |  |
Property & Casualty |  |  |  |
Reinsurance companies |  | $ | 7.4 |  |  | $ | 3.1 |
State insurance facilities |  | 96.6 |  |  | 97.7 |
Group benefits |  | 306.2 |  |  | 352.4 |
Life and health |  | 14.0 |  |  | 9.3 |
Total |  | $ | 424.2 |  |  | $ | 462.5 |
Summary of Effects of Reinsurance on Premiums and Benefits | The effects of reinsurance on premiums written and contract deposits; premiums and contract charges earned; and benefits, claims and settlement expenses were as follows (2022 recast for the adoption of LDTI):
($ in millions) |  | Gross Amount |  | Ceded to Other Companies(1) |  | Assumed from Other Companies |  | Net Amount
Year Ended December 31, 2023 |  |  |  |  |  |  |  |
Net premiums written and contract deposits(2) |  | $ | 1,583.6 |  |  | $ | 67.9 |  |  | $ | 36.9 |  |  | $ | 1,552.6 |
Net premiums and contract charges earned |  | 1,097.7 |  |  | 76.3 |  |  | 35.7 |  |  | $ | 1,057.1 |
Benefits, claims and settlement expenses |  | 803.6 |  |  | 45.7 |  |  | 11.2 |  |  | $ | 769.1 |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |
Net premiums written and contract deposits(2) |  | 1,499.0 |  |  | 62.9 |  |  | 53.0 |  |  | $ | 1,489.1 |
Net premiums and contract charges earned |  | 1,046.7 |  |  | 72.0 |  |  | 53.0 |  |  | $ | 1,027.7 |
Benefits, claims and settlement expenses |  | 772.5 |  |  | 43.5 |  |  | 18.0 |  |  | $ | 747.0 |
Year Ended December 31, 2021 |  |  |  |  |  |  |  |
Net premiums written and contract deposits(2) |  | 1,373.6 |  |  | 23.1 |  |  | 9.4 |  |  | $ | 1,359.9 |
Net premiums and contract charges earned |  | 912.4 |  |  | 33.3 |  |  | 9.7 |  |  | $ | 888.8 |
Benefits, claims and settlement expenses |  | 592.3 |  |  | 7.8 |  |  | 6.2 |  |  | $ | 590.7 |
(1) Excludes the annuity reinsurance agreement accounted for using the deposit method that is discussed in Note 8. (2) This measure is not based on accounting principles generally accepted in the United States of America (non-GAAP). An explanation of this non-GAAP measure is contained in the Glossary of Selected Terms included as an exhibit in the Company's reports filed with the SEC.

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- Definition Schedule of reinsurance recoverable on reserves. + References No definition available. + Details
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- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 605 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 + Details
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