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Deferred Policy Acquisition Costs (Tables)
 9 Months Ended
Sep. 30, 2017
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 nine months ended September 30, 2017 and 2016:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
 
($ in millions)
 
($ in millions)
Balance at the beginning of the period
$
364.6

 
$
409.1

 
$
358.4

 
$
361.1

 
Acquisition costs deferred
94.9

 
110.0

 
311.1

 
414.9

 
Amortization of deferred policy acquisition costs
(105.4
)
 
(130.9
)
 
(315.4
)
 
(387.8
)
Balance at the end of the period
$
354.1

 
$
388.2

 
$
354.1

 
$
388.2