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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
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) | September 30, 2023 |  | September 30, 2022 |  | December 31, 2022
Intangible assets subject to amortization | $ | 62.5 |  |  | $ | 79.4 |  |  | $ | 73.9 |
Indefinite-lived intangible assets 1 | 12.4 |  |  | 12.4 |  |  | 12.4 |
Total | $ | 74.9 |  |  | $ | 91.8 |  |  | $ | 86.3 |
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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.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 | The following table is a summary of the net carrying amount of other intangible assets:
(millions) | September 30, 2023 |  | September 30, 2022 |  | December 31, 2022
Intangible assets subject to amortization | $ | 62.5 |  |  | $ | 79.4 |  |  | $ | 73.9 |
Indefinite-lived intangible assets 1 | 12.4 |  |  | 12.4 |  |  | 12.4 |
Total | $ | 74.9 |  |  | $ | 91.8 |  |  | $ | 86.3 |
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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.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, 2023 |  | September 30, 2022 |  | December 31, 2022
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
Agency relationships | $ | 159.2 |  | $ | 96.7 |  | $ | 62.5 |  |  | $ | 159.2 |  | $ | 85.3 |  | $ | 73.9 |  |  | $ | 159.2 |  | $ | 88.1 |  | $ | 71.1 |
Software rights | 69.1 |  | 69.1 |  | 0 |  |  | 69.1 |  | 64.8 |  | 4.3 |  |  | 69.1 |  | 67.0 |  | 2.1 |
Trade name | 3.6 |  | 3.6 |  | 0 |  |  | 3.6 |  | 2.4 |  | 1.2 |  |  | 3.6 |  | 2.9 |  | 0.7 |
Total | $ | 231.9 |  | $ | 169.4 |  | $ | 62.5 |  |  | $ | 231.9 |  | $ | 152.5 |  | $ | 79.4 |  |  | $ | 231.9 |  | $ | 158.0 |  | $ | 73.9 |

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