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Investments - Net Realized and Unrealized Investment Gains and Losses and Change in Unrealized Gains and Losses on Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Fixed income securities - gross realized gains | $ 22.7 | $ 68.8 | $ 14.4
Fixed income securities - gross realizes (losses) | (3.6) | (1.8) | (7.3)
Net change in expected credit gains (losses) | (2.5) | 0.4 | 0.0
Fixed income securities, trading - gross realized gains | 12.2 | 18.2 | 34.3
Fixed income securities, trading, gross realizes (losses) | (2.0) | (3.8) | (2.6)
Privately-held investments net unrealized gains/(losses) | (23.4) | 0.0 | 47.2
Catastrophe bonds | (0.8) | 0.0 | 0.9
Total net realized and unrealized investment gains recorded in the statement of operations | 8.8 | 71.1 | 86.2
Change in available for sale net unrealized (losses)/gains: |  |  |
Fixed income securities | (157.6) | 108.5 | 164.9
Income tax expense | (0.3) | (0.5) | (13.6)
Total change in net unrealized (losses)/gains, net of taxes recorded in other comprehensive income | (157.9) | 108.0 | 151.3
Cash and cash equivalents |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Fixed income securities - gross realized gains | 2.0 | 0.5 | 0.1
Fixed income securities - gross realizes (losses) | (0.8) | (0.4) | (0.2)
Fixed income securities, trading - gross realized gains | 0.1 | 0.2 | 0.0
Fixed income securities, trading, gross realizes (losses) | (0.3) | (0.3) | (0.3)
Privately-held investments |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Fixed income securities, trading - gross realized gains | 0.6 | 0.0 | 0.2
Fixed income securities, trading, gross realizes (losses) | (13.8) | 0.0 | (0.2)
Privately-held investments net unrealized gains/(losses) | (18.1) | 20.4 | 0.0
MVI |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Income/(loss) from equity method investment | 0.1 | (0.4) | (0.1)
Chaspark |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Income/(loss) from equity method investment | 0.2 | 0.0 | 0.0
Digital Re |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Income/(loss) from equity method investment | 0.0 | (0.3) | (0.2)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Crop Re |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross realized gain on sale of equity method investment | 0.0 | 8.6 | 0.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Bene |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Gross realized gain on sale of equity method investment | $ 0.0 | $ 1.8 | $ 0.0

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