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Sales Inducements (Tables)
 3 Months Ended
Mar. 31, 2015
Insurance [Abstract]  
Changes in Deferred Sales Inducement Activity
The balances of and changes in sales inducements as of and for the periods ended March 31, 2015 and 2014 are as follows:

Changes in Deferred Sales Inducement Activity:
Three Months Ended 
 March 31,
($ in millions)
2015
 
2014
 
 
 
 
Balance, beginning of period
$
78.9

 
$
76.9

Sales inducements deferred
5.3

 
2.1

Amortization charged to income
(1.9
)
 
(0.2
)
Offsets to net unrealized investment gains or losses
  included in AOCI
(3.7
)
 
(3.2
)
Balance, end of period
$
78.6

 
$
75.6