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Intangible Assets - Additional Information (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2017 | Oct. 31, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Blue Waters |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, acquired |  | $ 2.1 |  |  |
Trademarks |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Value of the asset |  |  | $ 1.9 | $ 2.5 | $ 2.9
Trademarks | Blue Waters |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Value of the asset |  |  | 0.5 |  |
Aspen trademark |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Value of the asset |  |  | $ 1.4 |  |
Blue Waters |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Economic useful life |  |  | 5 years |  |
Insurance Licenses |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Value of the asset |  |  | $ 16.7 | 16.7 | 16.7
Renewal Rights |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Value of the asset |  |  | $ 0.0 | $ 1.0 | $ 1.4
Digital Re |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill, acquired | $ 1.8 |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |  |

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- Definition Finite And Indefinite Lived Intangible Assets By Major Class [Line Items] + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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