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Investments - Equity Method Investments (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2017 | Mar. 31, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | $ 7.6 | $ 6.2 |
Investment in the period |  |  | 0.0 | 0.4 | $ 2.0
Equity method investments, closing balance |  |  | 7.3 | 7.6 | 6.2
Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | (0.1) | 1.0 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | (0.2) |  |
MVI |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | 1.0 | 0.8 |
Investment in the period |  | $ 0.8 |  | 0.0 | 0.4
Equity method investments, closing balance |  |  | 0.8 | 1.0 | 0.8
MVI | Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | (0.2) | 0.2 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | 0.0 |  |
Multi-Line Insurer |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | 6.4 | 5.2 |
Investment in the period |  |  | 0.0 | 0.4 |
Equity method investments, closing balance |  |  | 6.5 | 6.4 | 5.2
Multi-Line Insurer | Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | 0.1 | 0.8 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | 0.0 |  |
Digital Re |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | 0.2 | 0.2 |
Investment in the period | $ 2.3 |  |  | 0.0 |
Equity method investments, closing balance |  |  | 0.0 | 0.2 | $ 0.2
Digital Re | Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | 0.0 | $ 0.0 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | $ (0.2) |  |

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- Definition Equity Method Investment, Aggregate Cost [Roll Forward] + References No definition available. + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481664/323-10-45-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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