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Sales Inducements (Tables)
 6 Months Ended
Jun. 30, 2014
Insurance [Abstract]  
Changes in Deferred Sales Inducement Activity
The balances of and changes in sales inducements as of and for the periods ended June 30, 2014 and 2013 are as follows:

Changes in Deferred Sales Inducement Activity:
Three Months Ended
 
Six Months Ended
($ in millions)
June 30,
 
June 30,
 
2014
 
2013
 
2014
 
2013
 
 
 
 
 
 
 
 
Balance, beginning of period
$
73.9

 
$
64.3

 
$
75.7

 
$
60.9

Sales inducements deferred
5.4

 
2.7

 
7.5

 
5.5

Amortization charged to income
(1.9
)
 
(2.8
)
 
(2.6
)
 
(3.5
)
Offsets to net unrealized investment gains or losses
  included in AOCI
(2.9
)
 
8.4

 
(6.1
)
 
9.7

Balance, end of period
$
74.5

 
$
72.6

 
$
74.5

 
$
72.6