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Discontinued Operations and Exit Activities - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 11, 2022 | Jan. 15, 2021 | Feb. 28, 2020 | Dec. 31, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 01, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  | $ 5,900,000 |  |  |  | $ 5,900,000 | $ 6,400,000 |  |
Cash and cash equivalents |  |  |  | 80,400,000 |  |  |  | 80,400,000 | 45,500,000 |  | $ 43,800,000
Investments |  |  |  | 59,500,000 |  |  |  | 59,500,000 | 56,000,000.0 |  |
Income tax expense |  |  |  |  |  |  |  | 900,000 | 5,600,000 |  |
Current income tax benefit |  |  |  |  |  |  |  | (200,000) | 3,700,000 |  |
Repayments of long-term debt |  |  |  |  |  |  |  | 28,300,000 | 458,100,000 |  |
Forecast |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from tax sharing agreement |  |  |  |  |  |  | $ 400,000 |  |  |  |
New Saxon 2019 Limited |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Parents interest, controlling (approximately) |  |  | 73.00% |  |  |  |  |  |  |  |
DBMG |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  |  |  |  | 6,500,000 |  |  |
Restructuring reserve |  |  |  | 0 |  |  |  | 0 |  |  |
Non-Operating Corporate | LIBOR plus 5.75% Line of Credit, due 2024 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 6.75% |  |  |  |  |  |  |  |  |
Beyond6 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration to be received |  | $ 106,500,000 |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  | 70,000,000 |  |  |  |  |  |  |  |  |
Beyond6 | 2020 Revolving Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | 15,000,000 |  |  |  |  |  |  |  |  |
Beyond6 | 2021 Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 27,900,000 |  |  |  |  |  |  |  |  |
GMSL |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiary |  |  |  |  |  |  |  |  | 1,200,000 |  |
Ownership percentage before sale of stock |  |  | 100.00% |  |  |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiary |  |  |  |  |  |  |  | 0 | (159,900,000) |  |
Asset held for sale |  |  |  | 0 |  |  |  | 0 | $ 1,500,000 |  |
Discontinued Operations | CIG |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiary | $ (1,800,000) |  |  |  | $ (200,800,000) |  |  |  |  |  |
Current income tax benefit |  |  |  |  |  |  |  | (3,100,000) |  |  |
Proceeds from tax sharing agreement |  |  |  | $ 900,000 |  |  |  |  |  |  |
Discontinued Operations | CIG | CGIC |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  | 3,100,000 |  |  |
Deemed contribution tax received | $ 1,800,000 |  |  |  |  |  |  |  |  |  |
Discontinued Operations | CIG | Insurance Services |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment book value |  |  |  |  |  |  |  |  |  | $ 544,000,000 |
Accumulated other comprehensive income |  |  |  |  |  |  |  |  |  | 344,000,000 |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  | 62,500,000 |
Investments |  |  |  |  |  |  |  |  |  | $ 26,700,000 |
Discontinued Operations | Beyond6 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of subsidiary |  |  |  |  | $ 500,000 | $ 39,200,000 |  |  |  |  |
Disposal Group, Not Discontinued Operations | HC2 Network |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Employee-related termination costs |  |  |  |  |  |  |  | 700,000 |  |  |
Net loss |  |  |  |  |  |  |  | $ 30,000 |  |  |

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