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Reinsurance (Tables)
9 Months Ended
Sep. 30, 2021
Insurance [Abstract]  
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:
($ in millions)Gross
Amount
Ceded to
Other
Companies(1)
Assumed
from Other
Companies
Net
Amount
Three months ended September 30, 2021    
Premiums written and contract deposits(2)
$366.0 $5.5 $2.6 $363.1 
Premiums and contract charges earned230.9 8.1 2.6 225.4 
Benefits, claims and settlement expenses164.5 1.5 1.8 164.8 
Three months ended September 30, 2020    
Premiums written and contract deposits(2)
$368.6 $2.1 $2.4 $368.9 
Premiums and contract charges earned237.1 4.2 2.4 235.3 
Benefits, claims and settlement expenses59.4 (90.1)1.9 151.4 
Nine months ended September 30, 2021
Premiums written and contract deposits(2)
$1,037.8 $17.0 $6.6 $1,027.4 
Premiums and contract charges earned696.6 24.6 6.8 678.8 
Benefits, claims and settlement expenses444.7 3.0 4.5 446.2 
Nine months ended September 30, 2020
Premiums written and contract deposits(2)
$1,034.7 $14.8 $6.9 $1,026.8 
Premiums and contract charges earned710.9 20.9 7.0 697.0 
Benefits, claims and settlement expenses342.2 (85.8)5.1 433.1 
(1)    Excludes the annuity reinsurance transaction accounted for using the deposit method that is discussed in Note 5.
(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.