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Investments - Debt Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt securities, available for sale    
Cost or amortized cost $ 4,617.0 $ 5,143.8
Gross unrealized gains 47.2 32.3
Gross unrealized losses (21.5) (40.2)
Net foreign currency losses (7.5) (4.9)
Fair value 4,635.2 5,131.0
Debt securities, trading    
Cost or amortized cost 140.9 187.3
Gross unrealized gains 0.4 0.6
Gross unrealized losses (23.7) (25.7)
Net foreign currency losses 0.0 0.0
Fair value 117.6 162.2
Debt securities, available for sale, allowance for credit losses 0.0 1.1
Asset-backed securities    
Debt securities, available for sale    
Cost or amortized cost 1,001.5 1,142.7
Gross unrealized gains 9.6 11.2
Gross unrealized losses (3.3) (4.2)
Net foreign currency losses 0.0 0.0
Fair value 1,007.8 1,149.7
Debt securities, trading    
Cost or amortized cost 20.0 54.7
Gross unrealized gains 0.0 0.0
Gross unrealized losses (0.9) (1.6)
Net foreign currency losses 0.0 0.0
Fair value 19.1 53.1
Residential mortgage-backed securities    
Debt securities, available for sale    
Cost or amortized cost 930.1 985.8
Gross unrealized gains 11.8 8.3
Gross unrealized losses (10.9) (20.3)
Net foreign currency losses 0.0 0.0
Fair value 931.0 973.8
Debt securities, trading    
Cost or amortized cost 54.8 56.4
Gross unrealized gains 0.1 0.0
Gross unrealized losses (7.0) (7.7)
Net foreign currency losses 0.0 0.0
Fair value 47.9 48.7
Commercial mortgage-backed securities    
Debt securities, available for sale    
Cost or amortized cost 172.2 224.2
Gross unrealized gains 2.3 1.4
Gross unrealized losses (0.5) (1.1)
Net foreign currency losses 0.0 0.0
Fair value 174.0 224.5
Debt securities, trading    
Cost or amortized cost 46.3 56.8
Gross unrealized gains 0.3 0.5
Gross unrealized losses (3.9) (5.5)
Net foreign currency losses 0.0 0.0
Fair value 42.7 51.8
Corporate debt securities    
Debt securities, available for sale    
Cost or amortized cost 1,615.3 1,905.2
Gross unrealized gains 15.9 9.1
Gross unrealized losses (5.4) (10.4)
Net foreign currency losses (7.5) (4.0)
Fair value 1,618.3 1,899.9
Debt securities, trading    
Cost or amortized cost 15.5 15.1
Gross unrealized gains 0.0 0.1
Gross unrealized losses (11.7) (10.6)
Net foreign currency losses 0.0 0.0
Fair value 3.8 4.6
U.S. government and government agency    
Debt securities, available for sale    
Cost or amortized cost 875.4 861.0
Gross unrealized gains 7.4 2.2
Gross unrealized losses (1.4) (4.2)
Net foreign currency losses 0.0 0.0
Fair value 881.4 859.0
Debt securities, trading    
Cost or amortized cost 4.3 4.3
Gross unrealized gains 0.0 0.0
Gross unrealized losses (0.2) (0.3)
Net foreign currency losses 0.0 0.0
Fair value 4.1 4.0
Non-U.S. government and government agency    
Debt securities, available for sale    
Cost or amortized cost 22.5 24.9
Gross unrealized gains 0.2 0.1
Gross unrealized losses 0.0 0.0
Net foreign currency losses 0.0 (0.9)
Fair value $ 22.7 $ 24.1