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Deferred Policy Acquisition Costs
 3 Months Ended
Mar. 31, 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 months ended March 31, 2018 and 2017:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
 
($ in millions)
Balance at the beginning of the period
$
294.3

 
$
358.4

 
Acquisition costs deferred
116.4

 
122.8

 
Amortization of deferred policy acquisition costs
(90.8
)
 
(113.7
)
Balance at the end of the period
$
319.9

 
$
367.5