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