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Schedule I - Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Fair Value $ 6,589.3  
Amount at which shown at the balance sheet 6,741.5  
Privately-held Investments [1] 286.8 $ 475.0
Other Investments [2] 267.2 209.3
Fair Value, Recurring [Member] | Apollo originating partnership    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Privately-held Investments 73.6  
Fair Value, Recurring [Member] | Apollo real estate fund    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments 78.6  
Fair Value, Recurring [Member] | Apollo originating partnership    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Privately-held Investments 73.6 $ 112.4
U.S. government    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 1,767.7  
Fair Value 1,741.9  
Amount at which shown at the balance sheet 1,741.9  
U.S. agency    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 7.5  
Fair Value 7.2  
Amount at which shown at the balance sheet 7.2  
Municipal    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 85.8  
Fair Value 83.9  
Amount at which shown at the balance sheet 83.9  
Corporate    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 2,200.8  
Fair Value 2,137.5  
Amount at which shown at the balance sheet 2,137.5  
High yield loans    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 101.7  
Fair Value 102.4  
Amount at which shown at the balance sheet 102.4  
Non-U.S. government-backed corporate    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 135.7  
Fair Value 134.1  
Amount at which shown at the balance sheet 134.1  
Non-U.S. government    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 272.6  
Fair Value 271.2  
Amount at which shown at the balance sheet 271.2  
Asset-backed    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 767.7  
Fair Value 770.8  
Amount at which shown at the balance sheet 859.7  
Asset-backed | Fair Value, Recurring [Member] | Apollo originating partnership    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Other Investments 88.9  
Non-agency commercial mortgage-backed securities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 5.0  
Fair Value 4.4  
Amount at which shown at the balance sheet 4.4  
Agency mortgage-backed    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 635.0  
Fair Value 549.8  
Amount at which shown at the balance sheet 549.8  
Fixed maturities    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 5,979.5  
Fair Value 5,803.2  
Amount at which shown at the balance sheet 5,892.1  
Short-term investments — Available for sale    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 262.9  
Fair Value 262.9  
Amount at which shown at the balance sheet 262.9  
Catastrophe bonds, trading    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 1.0  
Fair Value 1.0  
Amount at which shown at the balance sheet 1.0  
Privately-held investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Amortized Cost or Cost 312.0  
Fair Value 237.4  
Amount at which shown at the balance sheet 311.0  
Equity Method Investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Fair Value 7.3  
Amount at which shown at the balance sheet 7.3  
Other investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Fair Value 188.6  
Amount at which shown at the balance sheet $ 267.2  
[1] Privately-held investments, trading at fair value include related party investments totaling $73.6 million (2023 — $112.4 million). Privately-held investments, available for sale include related party investments totaling $Nil (2023 — $14.9 million).
[2] Other investments includes related party investments in Funds Managed by Apollo of $78.6 million (2023 — $39.8 million).