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Sales Inducements (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 and 2014 are as follows:

Changes in Deferred Sales Inducement Activity:
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
($ in millions)
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Balance, beginning of period
$
78.6

 
$
75.6

 
$
78.9

 
$
76.9

Sales inducements deferred
4.3

 
5.4

 
9.6

 
7.5

Amortization charged to income
(2.9
)
 
(2.6
)
 
(4.8
)
 
(2.8
)
Offsets to net unrealized investment gains or losses
  included in AOCI
7.4

 
(2.9
)
 
3.7

 
(6.1
)
Balance, end of period
$
87.4

 
$
75.5

 
$
87.4

 
$
75.5