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Sales Inducements (Tables)
12 Months Ended
Dec. 31, 2013
Insurance [Abstract]  
Changes in Deferred Sales Inducement Activity
Changes in Deferred Sales Inducement Activity:
Years Ended December 31,
($ in millions)
2013
 
2012
 
2011
 
 
 
 
 
 
Deferred asset, beginning of period
$
60.9

 
$
49.7

 
$
20.4

Sales inducements deferred
10.7

 
15.4

 
48.3

Amortization charged to income
(7.3
)
 
(6.8
)
 
(4.9
)
Offsets to net unrealized investment gains or losses included in AOCI
11.4

 
2.6

 
(14.1
)
Deferred asset, end of period
$
75.7

 
$
60.9

 
$
49.7