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Sales Inducements (Tables)
 3 Months Ended
Mar. 31, 2013
Insurance [Abstract]  
Changes in Deferred Sales Inducement Activity
Deferred sales inducements are included in other assets on the balance sheets and amortization of deferred sales inducements is included in other operating expense on the statements of income and comprehensive income.

Changes in Deferred Sales Inducement Activity:
Three Months Ended
($ in millions)
March 31,
 
2013
 
2012
 
 

 
As restated
and amended
 
 
 
 
Deferred asset, beginning of period
$
60.9

 
$
49.7

Sales inducements deferred
2.8

 
4.8

Amortization charged to income
(0.7
)
 
(3.6
)
Offsets to net unrealized investment gains or losses included in AOCI
1.3

 
(0.1
)
Deferred asset, end of period
$
64.3

 
$
50.8