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Investments - Other Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | $ 6.2 | $ 3.9 | $ 0.9
Investment in the period |  | 0.4 | 2.0 | 3.2
Proceeds from Sale of Equity Method Investments |  |  | 0.0 | (0.5)
Closing value of investment, ending balance |  | 7.0 | 6.2 | 3.9
Fair Value, Recurring [Member] | Real estate fund (Dec 2017) |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Investments, fair value |  | 125.2 | 134.6 | 129.9
Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | 0.4 | 0.3 | 0.3
MVI |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | 0.8 | 0.5 | 0.0
Investment in the period | $ 0.8 | 0.0 | 0.4 | 0.4
Proceeds from Sale of Equity Method Investments |  |  | 0.0 | 0.0
Closing value of investment, ending balance |  | 0.8 | 0.8 | 0.5
MVI | Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | 0.0 | (0.1) | 0.1
Digital Re |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | 0.2 | 0.2 | 0.4
Investment in the period |  | 0.0 | 0.0 | 0.3
Proceeds from Sale of Equity Method Investments |  |  | 0.0 | (0.5)
Closing value of investment, ending balance |  | 0.2 | 0.2 | 0.2
Digital Re | Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | 0.0 | 0.0 | 0.0
Multi-Line Insurer |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | 5.2 | 3.2 | 0.5
Investment in the period |  | 0.4 | 1.6 | 2.5
Proceeds from Sale of Equity Method Investments |  |  | 0.0 | 0.0
Closing value of investment, ending balance |  | 6.0 | 5.2 | 3.2
Multi-Line Insurer | Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | $ 0.4 | $ 0.4 | $ 0.2

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