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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
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Fixed income securities - gross realized gains $ 1.6 $ 2.9 $ 22.7
Fixed income securities - gross realizes (losses) (41.5) (58.4) (3.6)
Net change in expected credit gains (losses) 4.8 (5.0) (2.5)
Fixed income securities, trading - gross realized gains 1.0 0.2 12.2
Fixed income securities, trading, gross realizes (losses) (3.5) (1.8) (2.0)
Privately-held investments net unrealized gains/(losses) 65.9 (113.9) (23.4)
Catastrophe bonds 0.1 0.2 (0.8)
Total net realized and unrealized investment (losses)/gains recorded in the consolidated statement of operations 14.5 (177.6) 8.8
Change in available for sale net unrealized (losses)/gains:      
Fixed income securities 126.2 (391.7) (157.6)
Income tax benefit/(expense) (20.6) 23.9 (0.3)
Total change in net unrealized (losses)/gains, net of taxes recorded in other comprehensive income 105.6 (367.8) (157.9)
Privately-held investments      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Fixed income securities, trading - gross realized gains 0.8 0.7 0.6
Fixed income securities, trading, gross realizes (losses) 0.0 (0.1) (13.8)
Privately-held investments net unrealized gains/(losses) 15.2 2.5 (18.1)
Short-term investments      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Fixed income securities - gross realized gains 0.6 1.0 2.0
Fixed income securities - gross realizes (losses) (0.9) (0.5) (0.8)
Fixed income securities, trading - gross realized gains 0.1 0.0 0.1
Fixed income securities, trading, gross realizes (losses) (0.3) 0.0 (0.3)
MVI      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Income/(loss) from equity method investment 0.2 0.0 0.1
Multi-Line Insurer      
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Income/(loss) from equity method investment $ 0.8 $ (0.4) $ 0.2