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Deferred Policy Acquisition Costs
 6 Months Ended
Jun. 30, 2015
Deferred Policy Acquisition Costs Disclosures [Abstract]  
Deferred Policy Acquisition Costs
Deferred Policy Acquisition Costs

The balances of and changes in deferred policy acquisition costs (“DAC”) as of and for the periods ended June 30, 2015 and 2014 are as follows:

Changes in Deferred Policy Acquisition Costs:
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
($ in millions)
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Balance, beginning of period
$
423.0

 
$
454.8

 
$
430.9

 
$
470.1

Policy acquisition costs deferred
29.3

 
21.4

 
54.2

 
38.3

Costs amortized to expenses:
 
 
 
 
 
 
 
Recurring costs
(17.5
)
 
(18.3
)
 
(32.8
)
 
(45.9
)
Assumption unlocking
—

 
—

 
(4.0
)
 
—

Realized investment gains (losses)
(3.3
)
 
(1.9
)
 
0.5

 
9.0

Offsets to net unrealized investment gains or losses
  included in AOCI
42.1

 
(14.5
)
 
24.8

 
(30.0
)
Balance, end of period
$
473.6

 
$
441.5

 
$
473.6

 
$
441.5