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Deferred Policy Acquisition Costs (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2015 and 2014 are as follows:

Changes in Deferred Policy Acquisition Costs:
Three Months Ended 
 March 31,
($ in millions)
2015
 
2014
 
 
 
 
Balance, beginning of period
$
430.9

 
$
470.1

Policy acquisition costs deferred
24.9

 
16.9

Costs amortized to expenses:
 
 
 
Recurring costs
(15.3
)
 
(27.6
)
Assumption unlocking
(4.0
)
 
—

Realized investment gains (losses)
3.8

 
10.9

Offsets to net unrealized investment gains or losses
  included in AOCI
(17.3
)
 
(15.5
)
Balance, end of period
$
423.0

 
$
454.8