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Sales Inducements (Tables)
 9 Months Ended
Sep. 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 September 30, 2014 and 2013 are as follows:

Changes in Deferred Sales Inducement Activity:
Three Months Ended
 
Nine Months Ended
($ in millions)
September 30,
 
September 30,
 
2014
 
2013
 
2014
 
2013
 
 
 
 
 
 
 
 
Balance, beginning of period
$
74.5

 
$
72.6

 
$
75.7

 
$
60.9

Sales inducements deferred
5.2

 
2.7

 
12.7

 
8.2

Amortization charged to income
(2.2
)
 
(1.9
)
 
(4.8
)
 
(5.4
)
Offsets to net unrealized investment gains or losses
  included in AOCI
1.2

 
0.2

 
(4.9
)
 
9.9

Balance, end of period
$
78.7

 
$
73.6

 
$
78.7

 
$
73.6