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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
During the three months ended March 31, 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)March 31, 2021March 31, 2020December 31, 2020
Intangible assets subject to amortization$144.8 $201.4 $159.0 
Indefinite-lived intangible assets1
12.4 12.4 12.4 
Total$157.2 $213.8 $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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.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:
March 31, 2021March 31, 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 $219.6 $36.6 $256.2 $183.0 $73.2 $256.2 $210.4 $45.8 
Agency relationships159.2 68.3 90.9 159.2 56.9 102.3 159.2 65.4 93.8 
Software rights 69.1 51.8 17.3 79.1 53.2 25.9 69.1 49.7 19.4 
Trade name
0 0 0 34.8 34.8 0 0 0 0 
Total$484.5 $339.7 $144.8 $529.3 $327.9 $201.4 $484.5 $325.5 $159.0 
Amortization expense was $14.2 million, compared to $14.5 million for the three months ended March 31, 2021 and 2020, respectively.