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Summary of Significant Accounting Policies - Dividends Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
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Dec. 17, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 28, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Dividends payable (in dollars per share) |  |  |  |  | $ 0.01
Dividend Payment | $ (3.3) | $ (3.3) | $ 0.0 | $ 0.0 |

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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