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Goodwill and Intangible Assets
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Goodwill
The carrying amount of goodwill increased $3.3 million as a result of the acquisition of a small excess and surplus lines insurance company during the second quarter 2017, which will provide us flexibility in our Commercial Lines business going forward. Goodwill recorded at September 30, 2017, was $452.7 million. No accumulated goodwill impairment losses exist.
Intangible Assets
The following table is a summary of the net carrying amount of other intangible assets as of September 30, 2017 and 2016, and December 31, 2016:
(millions)
September 30, 2017

 
September 30, 2016

 
December 31, 2016

Intangible assets subject to amortization
$
372.2

 
$
435.9

 
$
420.4

Indefinite-lived intangible assets1
12.4

 
12.4

 
12.4

Total
$
384.6

 
$
448.3

 
$
432.8


1 Indefinite-lived intangible assets are comprised of state insurance and agent licenses. State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.

Intangible assets subject to amortization consisted of the following:
(millions)
September 30, 2017
 
September 30, 2016
 
December 31, 2016
Category
Gross Carrying Amount

Accumulated Amortization

Net Carrying Amount

 
Gross Carrying Amount

Accumulated Amortization

Net Carrying Amount

 
Gross Carrying Amount

Accumulated Amortization

Net Carrying Amount

Policies in force
$
256.2

$
91.5

$
164.7

 
$
256.2

$
55.0

$
201.2

 
$
256.2

$
64.1

$
192.1

Agency relationships
159.2

28.4

130.8

 
159.2

17.1

142.1

 
159.2

19.9

139.3

Software rights
79.1

26.8

52.3

 
79.1

16.1

63.0

 
79.1

18.8

60.3

Trade name
34.8

10.4

24.4

 
34.8

5.2

29.6

 
34.8

6.1

28.7

Total
$
529.3

$
157.1

$
372.2

 
$
529.3

$
93.4

$
435.9

 
$
529.3

$
108.9

$
420.4



Amortization expense was $17.2 million and $48.2 million for the three and nine months ended September 30, 2017, respectively, compared to $15.5 million and $46.6 million during the same period last year.
During the third quarter 2017, we revised our estimate of the economic useful life of our trade name intangible asset from an original life of 10 years to a remaining life of 2 years. The decrease in the useful life represents the estimated length of time that it is expected to take to transition the branding of our Property business from the ASI trade name to “Progressive Home.” As of September 30, 2017, the remaining average life of all of our intangible assets is 5.2 years.