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Deferred Policy Acquisition Costs (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017:
 
 
 
Twelve Months Ended 
 December 31, 2018
 
Twelve Months Ended December 31, 2017
 
 
($ in millions)
Balance at the beginning of the period
 
$
294.3

 
$
358.4

 
Acquisition costs deferred
 
325.8

 
336.4

 
Amortization of deferred policy acquisition costs
 
(371.6
)
 
(400.5
)
Balance at the end of the period
 
$
248.5

 
$
294.3