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Reinsurance and Catastrophes (Tables)
 12 Months Ended
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,
20232022
Reinsurance recoverables on reserves and unpaid claims
Property & Casualty
Reinsurance companies
$7.4 $3.1 
State insurance facilities
96.6 97.7 
Group benefits306.2 352.4 
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 earned1,097.7 76.3 35.7 $1,057.1 
Benefits, claims and settlement expenses803.6 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 earned1,046.7 72.0 53.0 $1,027.7 
Benefits, claims and settlement expenses772.5 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 earned912.4 33.3 9.7 $888.8 
Benefits, claims and settlement expenses592.3 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.