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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
During the nine months ended September 30, 2020, there were no changes to the carrying amount of goodwill. No accumulated goodwill impairment losses exist.
Intangible Assets
The following table is a summary of the net carrying amount of other intangible assets:
(millions)September 30, 2020September 30, 2019December 31, 2019
Intangible assets subject to amortization$173.1 $230.5 $215.9 
Indefinite-lived intangible assets1
12.4 12.4 12.4 
Total$185.5 $242.9 $228.3 
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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.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, 2020September 30, 2019December 31, 2019
CategoryGross
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 $201.3 $54.9 $256.2 $164.7 $91.5 $256.2 $173.9 $82.3 
Agency relationships159.2 62.6 96.6 159.2 51.2 108.0 159.2 54.0 105.2 
Software rights 69.1 47.5 21.6 79.1 48.1 31.0 79.1 50.7 28.4 
Trade name
0 0 0 34.8 34.8 0 34.8 34.8 0 
Total$484.5 $311.4 $173.1 $529.3 $298.8 $230.5 $529.3 $313.4 $215.9 
Amortization expense was $14.2 million and $42.8 million for the three and nine months ended September 30, 2020, respectively, compared to $15.8 million and $51.7 million during the same periods last year. During the first quarter 2020, one software rights intangible asset, with a gross carrying value of $10.0 million, was fully amortized.