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Deferred Policy Acquisition Costs and Value of Business Acquired (Tables)
 12 Months Ended
Dec. 31, 2016
Deferred Policy Acquisition Costs and Value of Business Acquired [Abstract]  
Deferred Policy Acquisition Costs and Value of Business Acquired
The following table presents a rollforward of DAC and VOBA for the periods indicated:
 
DAC
 
VOBA
 
Total
Balance at January 1, 2014
$
476.2

 
$
696.6

 
$
1,172.8

Deferrals of commissions and expenses
69.8

 
6.9

 
76.7

Amortization:
 
 
 
 
 
Amortization
(91.0
)
 
(113.3
)
 
(204.3
)
Interest accrued
35.9

 
59.2

(1 
) 
95.1

Net amortization included in the Consolidated Statements of Operations
(55.1
)
 
(54.1
)
 
(109.2
)
Change in unrealized capital gains/losses on available-for-sale securities
(94.4
)
 
(122.6
)
 
(217.0
)
Balance as of December 31, 2014
396.5

 
526.8

 
923.3

Deferrals of commissions and expenses
76.9

 
5.8

 
82.7

Amortization:
 
 
 
 
 
Amortization
(106.8
)
 
(117.9
)
 
(224.7
)
Interest accrued
36.2

 
55.9

(1 
) 
92.1

Net amortization included in the Consolidated Statements of Operations
(70.6
)
 
(62.0
)
 
(132.6
)
Change in unrealized capital gains/losses on available-for-sale securities
117.6

 
238.1

 
355.7

Balance as of December 31, 2015
520.4

 
708.7

 
1,229.1

Deferrals of commissions and expenses
73.5

 
5.3

 
78.8

Amortization:
 
 
 
 
 
Amortization
(95.7
)
 
(159.8
)
 
(255.5
)
Interest accrued
37.5

 
51.5

(1 
) 
89.0

Net amortization included in the Consolidated Statements of Operations
(58.2
)
 
(108.3
)
 
(166.5
)
Change in unrealized capital gains/losses on available-for-sale securities
(59.3
)
 
(68.3
)
 
(127.6
)
Balance as of December 31, 2016
$
476.4

 
$
537.4

 
$
1,013.8

(1) 
Interest accrued at the following rates for VOBA: 5.5% to 7.0% during 2016, 2015 and 2014.

Intangible Assets Arising from Insurance Contracts Acquired in Business Combination
The estimated amount of VOBA amortization expense, net of interest, during the next five years 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
2017
 
46.0

2018
 
36.9

2019
 
30.9

2020
 
27.4

2021
 
24.1