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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Indefinite-Lived 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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.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
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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.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