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Reinsurance (Tables)
 3 Months Ended
Mar. 31, 2024
Insurance [Abstract]  
Schedule of Effects of Reinsurance on Premiums and Benefits The effects of reinsurance on net premiums written and contract deposits; net premiums and contract charges earned; and benefits, claims and settlement expenses were as follows:
($ in millions)Direct
Amount
Ceded to
Other
Companies(1)
Assumed
from Other
Companies		Net
Amount
Three months ended March 31, 2024
Net premiums written and contract deposits(2)
$386.4 $18.1 $7.3 $375.6 
Net premiums and contract charges earned288.0 19.8 7.0 275.2 
Benefits, claims and settlement expenses186.9 14.6 4.0 176.3 
Three months ended March 31, 2023
Net premiums written and contract deposits(2)
$367.8 $16.6 $10.4 $361.6 
Net premiums and contract charges earned264.0 18.5 10.4 255.9 
Benefits, claims and settlement expenses192.9 12.7 3.0 183.2 
(1)    Excludes the annuity reinsurance transaction accounted for using the deposit method.
(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 Exhibit 99.1 in the Company's reports filed with the SEC.