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Deferred Policy Acquisition Costs (Tables)
 12 Months Ended
Dec. 31, 2021
Insurance [Abstract]  
Reconciliation of beginning and ending deferred policy acquisition costs
The following table represents a reconciliation of beginning and ending deferred policy acquisition costs for the twelve months ended December 31, 2021 and 2020:
Twelve Months Ended December 31, 2021Twelve Months Ended December 31, 2020
($ in millions)
Balance at the beginning of the period$306.6 $291.1 
Acquisition costs deferred398.3 481.2 
Amortization of deferred policy acquisition costs(414.1)(465.7)
Balance at the end of the period$290.8 $306.6