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Sales Inducements
 12 Months Ended
Dec. 31, 2014
Insurance [Abstract]  
Sales Inducements
Sales Inducements

The balances of and changes in sales inducements as of and for the years ended December 31, are as follows:

Changes in Deferred Sales Inducement Activity:
For the years ended December 31,
($ in millions)
2014
 
2013
 
2012
 
 
 
 
 
 
Balance, beginning of period
$
76.9

 
$
63.3

 
$
50.6

Sales inducements deferred
17.4

 
10.7

 
15.4

Amortization charged to income
(7.9
)
 
(8.5
)
 
(5.8
)
Offsets to net unrealized investment gains or losses included in AOCI
(7.5
)
 
11.4

 
3.1

Balance, end of period
$
78.9

 
$
76.9

 
$
63.3