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Deferred Policy Acquisition Costs (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2017 and 2016:
 
 
Three Months Ended March 31,
 
 
2017
 
2016
 
($ in millions)
Balance at the beginning of the period
$
358.4

 
$
361.1

 
Acquisition costs deferred
122.8

 
176.8

 
Amortization of deferred policy acquisition costs
(113.7
)
 
(130.2
)
Balance at the end of the period
$
367.5

 
$
407.7