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Deferred Acquisition Costs
 12 Months Ended
Dec. 31, 2018
Deferred Acquisition Costs  
Deferred Acquisition Costs

7.  Deferred Acquisition Costs

Acquisition costs deferred and amortized were as follows:

 

 

 

 

 

 

 

 

 

 

 

 

 

For the year ended December 31, 

 

     

2018

     

2017

     

2016

 

 

(in millions)

Balance at beginning of year

 

$

3,540.7

 

$

3,380.2

 

$

3,276.1

Costs deferred during the year

 

 

414.9

 

 

421.8

 

 

402.3

Amortized to expense during the year (1)

 

 

(253.5)

 

 

(234.6)

 

 

(285.1)

Adjustment related to unrealized (gains) losses on available-for-sale securities and derivative instruments

 

 

184.9

 

 

(26.7)

 

 

(13.1)

Other (2)

 

 

(193.5)

 

 

—

 

 

—

Balance at end of year

 

$

3,693.5

 

$

3,540.7

 

$

3,380.2

(1)

Includes adjustments for revisions to estimated gross profits.

(2)

Reflects the impact of capitalized costs written off or transferred from DAC to a contract cost asset as a result of adopting revenue recognition guidance. See Note 1, Nature of Operations and Significant Accounting Policies, under the caption “Adoption of Revenue Recognition Guidance” for further details.