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DAC and VOBA
 12 Months Ended
Dec. 31, 2012
Deferred Policy Acquisition Costs and Value of Business Acquired [Abstract]  
Deferred Policy Acquisition Costs ("DAC") and Value of Business Acquired ("VOBA")
Deferred Policy Acquisition Costs and Value of Business Acquired

Activity within DAC was as follows for the years ended December 31, 2012, 2011 and 2010.
 
2012
 
2011
 
2010
Balance at January 1
$
334.9

 
$
307.6

 
$
355.7

Deferrals of commissions and expenses
79.1

 
79.8

 
74.7

Amortization:
 
 
 
 
 
Amortization
(72.1
)
 
(71.5
)
 
(40.5
)
Interest accrued(1)
31.1

 
31.9

 
29.9

Net amortization included in the Consolidated Statements of Operations
(41.0
)
 
(39.6
)
 
(10.6
)
Change in unrealized capital gains/losses on available-for-sale securities
(76.5
)
 
(12.9
)
 
(112.2
)
Balance at December 31
$
296.5

 
$
334.9

 
$
307.6

(1) Interest accrued at 5.0% to 7.0% during 2012, 2011 and 2010.

Activity within VOBA was as follows for the years ended December 31, 2012, 2011 and 2010.
 
2012
 
2011
 
2010
Balance at January 1
$
593.6

 
$
864.2

 
$
981.2

Deferrals of commissions and expenses
8.1

 
8.5

 
17.6

Amortization:
 
 
 
 
 
Amortization
(152.6
)
 
(125.1
)
 
(16.0
)
Interest accrued(1)
62.5

 
70.5

 
67.8

Net amortization included in the Consolidated Statements of Operations
(90.1
)
 
(54.6
)
 
51.8

Change in unrealized capital gains/losses on available-for-sale securities
(130.2
)
 
(224.5
)
 
(186.4
)
Balance at December 31
$
381.4

 
$
593.6

 
$
864.2

(1) Interest accrued at 5.0% and 7.0% during 2012, 2011 and 2010

The estimated amount of VOBA amortization expense, net of interest, is $66.0, $50.7, $45.4, $42.3 and $34.9, for the years 2013, 2014, 2015, 2016 and 2017, respectively. Actual amortization incurred during these years may vary as assumptions are modified to incorporate actual results.