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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Net Carrying Amount of Other Intangible Assets | The following table is a summary of the net carrying amount of other intangible assets as of December 31, 2017 and 2016:
(millions) | December 31, 2017 |  | December 31, 2016
Intangible assets subject to amortization | $ | 354.2 |  |  | $ | 420.4 |
Indefinite-lived intangible assets 1 | 12.4 |  |  | 12.4 |
Total | $ | 366.6 |  |  | $ | 432.8 |
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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for both periods presented.
Intangible Assets Subject to Amortization | Intangible assets subject to amortization consisted of the following:
(millions) | December 31, 2017 |  | December 31, 2016
Category | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |
Policies in force | $ | 256.2 |  | $ | 100.7 |  | $ | 155.5 |  |  | $ | 256.2 |  | $ | 64.1 |  | $ | 192.1 |
Agency relationships | 159.2 |  | 31.3 |  | 127.9 |  |  | 159.2 |  | 19.9 |  | 139.3 |
Software rights | 79.1 |  | 29.4 |  | 49.7 |  |  | 79.1 |  | 18.8 |  | 60.3 |
Trade name | 34.8 |  | 13.7 |  | 21.1 |  |  | 34.8 |  | 6.1 |  | 28.7 |
Total | $ | 529.3 |  | $ | 175.1 |  | $ | 354.2 |  |  | $ | 529.3 |  | $ | 108.9 |  | $ | 420.4 |
Amortization on Intangible Assets | The estimated aggregate amortization on these intangible assets for each of the next five years as of December 31, 2017, is as follows:
(millions) |
Year | Amortization Expense |
2018 | $ | 71.9 |
2019 | 66.4 |
2020 | 56.9 |
2021 | 56.6 |
2022 | 29.2 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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