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Goodwill and Intangible Assets
 6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
During the six months ended June 30, 2021, 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)June 30, 2021June 30, 2020December 31, 2020
Intangible assets subject to amortization$134.1 $187.3 $159.0 
Indefinite-lived intangible assets1
12.4 12.4 12.4 
Total$146.5 $199.7 $171.4 
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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.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:
June 30, 2021June 30, 2020December 31, 2020
(millions)Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount		Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Category:
Policies in force$256.2 $228.7 $27.5 $256.2 $192.2 $64.0 $256.2 $210.4 $45.8 
Agency relationships159.2 71.1 88.1 159.2 59.7 99.5 159.2 65.4 93.8 
Software rights 69.1 54.0 15.1 69.1 45.3 23.8 69.1 49.7 19.4 
Trade name3.6 0.2 3.4 0 0 0 0 0 0 
Total$488.1 $354.0 $134.1 $484.5 $297.2 $187.3 $484.5 $325.5 $159.0 
During the second quarter 2021, we recognized a $3.6 million trade name intangible asset, with an estimated two-year life, in connection with the Protective Insurance acquisition.
Amortization expense was $14.3 million and $28.5 million for the three and six months ended June 30, 2021, respectively, compared to $14.1 million and $28.6 million during the same periods last year.