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Reinsurance and Catastrophes (Tables)
 12 Months Ended
Dec. 31, 2021
Insurance [Abstract]  
Summary of reinsurance recoverable on unpaid insurance reserves
The total amounts of reinsurance recoverable on unpaid insurance reserves classified as assets and reported in Other assets in the Consolidated Balance Sheets were as follows:
($ in millions)December 31,
20212020
Reinsurance recoverables on reserves and unpaid claims
Property & Casualty
Reinsurance companies
$10.4 $13.2 
State insurance facilities
99.9 99.7 
Life and health
9.3 9.6 
Total
$119.6 $122.5 
Effects of reinsurance on premiums and benefits The effects of reinsurance on premiums written and contract deposits; premiums and contract charges earned; and benefits, claims and settlement expenses were as follows:
($ in millions)Gross
Amount
Ceded to
Other
Companies(1)
Assumed
from Other
Companies		Net
Amount
Year Ended December 31, 2021
Premiums written and contract deposits(2)
$1,370.1 $23.1 $9.4 $1,356.4 
Premiums and contract charges earned913.2 33.3 9.7 889.6 
Benefits, claims and settlement expenses619.3 7.8 6.2 617.7 
Year Ended December 31, 2020
Premiums written and contract deposits(2)
1,369.9 20.4 9.8 1,359.3 
Premiums and contract charges earned949.6 28.8 9.9 930.7 
Benefits, claims and settlement expenses475.7 (86.2)7.0 568.9 
Year Ended December 31, 2019
Premiums written and contract deposits(2)
1,337.8 23.9 10.6 1,324.5 
Premiums and contract charges earned917.6 30.4 10.8 898.0 
Benefits, claims and settlement expenses633.9 56.3 7.5 585.1 
(1)    Excludes the annuity reinsurance agreement accounted for using the deposit method that is discussed in Note 6.
(2)    This measure is not based on accounting principles generally accepted in the U.S. (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.