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Deferred Policy Acquisition Costs
 9 Months Ended
Sep. 30, 2018
Insurance [Abstract]  
Deferred Policy Acquisition Costs
Deferred Policy Acquisition Costs
The following table represents a reconciliation of beginning and ending deferred policy acquisition costs for the three and nine months ended September 30, 2018 and 2017:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
 
($ in millions)
 
($ in millions)
Balance at the beginning of the period
$
298.6

 
$
364.6

 
$
294.3

 
$
358.4

 
Acquisition costs deferred
92.5

 
94.9

 
273.5

 
311.1

 
Amortization of deferred policy acquisition costs
(101.0
)
 
(105.4
)
 
(277.7
)
 
(315.4
)
Balance at the end of the period
$
290.1

 
$
354.1

 
$
290.1

 
$
354.1