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Deferred Policy Acquisition Costs (Tables)
 6 Months Ended
Jun. 30, 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 three and six months ended June 30, 2018 and 2017:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
 
($ in millions)
 
($ in millions)
Balance at the beginning of the period
$
319.9

 
$
367.5

 
$
294.3

 
$
358.4

 
Acquisition costs deferred
64.6

 
93.4

 
181.0

 
216.2

 
Amortization of deferred policy acquisition costs
(85.9
)
 
(96.3
)
 
(176.7
)
 
(210.0
)
Balance at the end of the period
$
298.6

 
$
364.6

 
$
298.6

 
$
364.6