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Intangible Assets - Summary of Changes in Intangible Assets (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 18, 2017 | Dec. 31, 2022 | Dec. 31, 2021
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |
Amortization |  | $ (0.1) | $ (0.9)
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning of the period |  | 3.9 | 3.9
Goodwill, Additions (Disposals) |  | 0.0 | 0.0
Goodwill, Impairment Loss |  | 0.0 | 0.0
Goodwill, End of the Period |  | 3.9 | 3.9
Intangible Assets and goodwill, Beginning of the period |  | 21.9 | 22.8
Intangible Assets and Goodwill, Additions (Disposals) |  | 0.0 | 0.0
Goodwill and Intangible Asset Impairment |  | 0.0 | 0.0
Intangible Assets and goodwill, End of the period |  | 21.8 | 21.9
Trademarks |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |
Intangible Assets, Beginning of the period |  | 1.3 | 1.6
Intangible Assets acquired (disposed) | $ 0.0 |  | 0.0
Amortization |  | (0.1) | (0.3)
Impairment of intangible assets (excluding goodwill) |  | 0.0 | 0.0
Intangible Assets, End of the period |  | 1.2 | 1.3
Agency Relationships |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |
Intangible Assets, Beginning of the period |  | 0.0 | 0.6
Intangible Assets acquired (disposed) |  |  | 0.0
Amortization |  |  | (0.6)
Impairment of intangible assets (excluding goodwill) |  |  | 0.0
Intangible Assets, End of the period |  |  | 0.0
Insurance Licenses |  |  |
Finite and Indefinite Lived Intangible Assets [Roll Forward] |  |  |
Intangible Assets, Beginning of the period |  | 16.7 | 16.7
Intangible Assets acquired (disposed) |  | 0.0 | 0.0
Amortization |  | 0.0 | 0.0
Impairment of intangible assets (excluding goodwill) |  | 0.0 | 0.0
Intangible Assets, End of the period |  | $ 16.7 | $ 16.7

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- Definition Finite-lived Intangible Assets Acquired (Disposed) + References No definition available. + Details
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- Definition Intangible Assets and Goodwill, Acquired (Disposed) + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 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)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 55 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=122137925&loc=d3e14258-109268 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(15)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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