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Deferred Policy Acquisition Costs and Value of Business Acquired (Tables)
 12 Months Ended
Dec. 31, 2013
Deferred Policy Acquisition Costs and Value of Business Acquired [Abstract]  
Deferred Policy Acquisition Costs and Value of Business Acquired
Activity within DAC and VOBA was as follows for the periods indicated:
 
DAC
 
VOBA
 
Total
Balance at January 1, 2011
$
307.6

 
$
864.2

 
$
1,171.8

Deferrals of commissions and expenses
79.8

 
8.5

 
88.3

Amortization:
 
 
 
 
 
Amortization
(71.5
)
 
(125.1
)
 
(196.6
)
Interest accrued(1)
31.9

 
70.5

 
102.4

Net amortization included in the Consolidated Statements of Operations
(39.6
)
 
(54.6
)
 
(94.2
)
Change in unrealized capital gains/losses on available-for-sale securities
(12.9
)
 
(224.5
)
 
(237.4
)
Balance at December 31, 2011
334.9

 
593.6

 
928.5

Deferrals of commissions and expenses
79.1

 
8.1

 
87.2

Amortization:
 
 
 
 
 
Amortization
(72.1
)
 
(152.6
)
 
(224.7
)
Interest accrued(1)
31.1

 
62.5

 
93.6

Net amortization included in the Consolidated Statements of Operations
(41.0
)
 
(90.1
)
 
(131.1
)
Change in unrealized capital gains/losses on available-for-sale securities
(76.5
)
 
(130.2
)
 
(206.7
)
Balance at December 31, 2012
296.5

 
381.4

 
677.9

Deferrals of commissions and expenses
71.3

 
7.2

 
78.5

Amortization:
 
 
 
 
 
Amortization
(69.7
)
 
(83.6
)
 
(153.3
)
Interest accrued(1)
34.0

 
61.0

 
95.0

Net amortization included in the Consolidated Statements of Operations
(35.7
)
 
(22.6
)
 
(58.3
)
Change in unrealized capital gains/losses on available-for-sale securities
144.1

 
330.6

 
474.7

Balance at December 31, 2013
$
476.2

 
$
696.6

 
$
1,172.8

(1) 
Interest accrued at the following rates for VOBA: 1.0% to 7.0% during 2013, 5.0% to 7.0% during 2012 and 5.0% to 7.0% during 2011.

Intangible Assets Arising from Insurance Contracts Acquired in Business Combination
The estimated amount of VOBA amortization expense, net of interest, is presented in the following table. Actual amortization incurred during these years may vary as assumptions are modified to incorporate actual results and/or changes in best estimates of future results.
Year
 
Amount
2014
 
$
62.7

2015
 
52.5

2016
 
46.8

2017
 
42.6

2018
 
40.6