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Goodwill and Intangible Assets - Schedule of Definite and Indefinite Life Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Definite Life Intangibles, Gross Carrying Amount | $ 607.5 | $ 569.5
Definite Life Intangibles, Accumulated Amortization | 335.2 | 288.9
Definite Life Intangibles, Net Amount | 272.3 | 280.6
Indefinite Life Intangible Assets | 47.8 | 47.8
Total Intangible Assets, Gross Carrying Amount | 655.3 | 617.3
Total Intangible Assets, Net Amount | 320.1 | 328.4
Trade Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite Life Intangible Assets | 5.2 | 5.2
Insurance Licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite Life Intangible Assets | 42.6 | 42.6
Value of Business Acquired |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite Life Intangibles, Gross Carrying Amount | 194.5 | 194.5
Definite Life Intangibles, Accumulated Amortization | 174.2 | 170.4
Definite Life Intangibles, Net Amount | 20.3 | 24.1
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite Life Intangibles, Gross Carrying Amount | 39.0 | 39.0
Definite Life Intangibles, Accumulated Amortization | 35.6 | 34.7
Definite Life Intangibles, Net Amount | 3.4 | 4.3
Agent Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite Life Intangibles, Gross Carrying Amount | 74.4 | 74.4
Definite Life Intangibles, Accumulated Amortization | 16.8 | 11.9
Definite Life Intangibles, Net Amount | 57.6 | 62.5
Internal-Use Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Definite Life Intangibles, Gross Carrying Amount | 299.6 | 261.6
Definite Life Intangibles, Accumulated Amortization | 108.6 | 71.9
Definite Life Intangibles, Net Amount | $ 191.0 | $ 189.7

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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