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Investments - Schedule of Company Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Measurement Alternative | $ 11.3 | $ 11.8
Equity Method | 43.6 | 38.8
Fair Value | 4.6 | 5.4
Investments | 59.5 | 56.0
Common stock |  |
Schedule of Equity Method Investments [Line Items] |  |
Measurement Alternative | 0.0 | 0.0
Equity Method | 3.0 | 2.1
Fair Value | 0.0 | 0.0
Investments | 3.0 | 2.1
Preferred stock and fixed maturities |  |
Schedule of Equity Method Investments [Line Items] |  |
Measurement Alternative | 0.0 | 0.5
Equity Method | 0.0 | 2.1
Fair Value | 4.6 | 5.4
Investments | 4.6 | 8.0
Put option |  |
Schedule of Equity Method Investments [Line Items] |  |
Measurement Alternative | 11.3 | 11.3
Equity Method | 0.0 | 0.0
Fair Value | 0.0 | 0.0
Investments | 11.3 | 11.3
Investment in securities |  |
Schedule of Equity Method Investments [Line Items] |  |
Measurement Alternative | 0.0 | 0.0
Equity Method | 40.6 | 34.6
Fair Value | 0.0 | 0.0
Investments | $ 40.6 | $ 34.6

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