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Investments - Fixed Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Available-for-sale securities            
Amortized cost, fixed maturities $ 68,829.7 $ 67,621.0   $ 67,103.9    
Gross unrealized gains, fixed maturities 429.2 629.8   270.7    
Gross unrealized losses, fixed maturities 6,476.6 5,718.6   7,743.2    
Allowance, fixed maturities 0.4 2.0 $ 3.9 0.1 $ 4.9 $ 6.5
Fair value, fixed maturities 62,781.9 [1] 62,530.2 [1]   59,631.3    
Accrued interest receivable 636.4 616.0   575.8    
U.S. government and agencies            
Available-for-sale securities            
Amortized cost, fixed maturities 1,975.1 1,719.1   1,964.6    
Gross unrealized gains, fixed maturities 6.4 19.3   0.1    
Gross unrealized losses, fixed maturities 274.6 233.5   248.8    
Fair value, fixed maturities 1,706.9 1,504.9   1,715.9    
Non-U.S. governments            
Available-for-sale securities            
Amortized cost, fixed maturities 550.7 522.2   565.3    
Gross unrealized gains, fixed maturities 13.8 16.9   18.9    
Gross unrealized losses, fixed maturities 74.8 59.2   63.8    
Fair value, fixed maturities 489.7 479.9   520.4    
States and political subdivisions            
Available-for-sale securities            
Amortized cost, fixed maturities 7,280.1 7,493.9   7,280.1    
Gross unrealized gains, fixed maturities 17.2 45.4   14.8    
Gross unrealized losses, fixed maturities 1,058.5 926.0   1,126.6    
Fair value, fixed maturities 6,238.8 6,613.3   6,168.3    
Corporate debt securities            
Available-for-sale securities            
Amortized cost, fixed maturities 35,732.7 35,707.6   37,495.4    
Gross unrealized gains, fixed maturities 286.1 433.7   219.5    
Gross unrealized losses, fixed maturities 3,723.8 3,059.9   4,530.1    
Allowance, fixed maturities 0.3 1.9 3.8   4.5  
Fair value, fixed maturities 32,294.7 33,079.5   33,184.8    
Residential mortgage-backed pass-through securities            
Available-for-sale securities            
Amortized cost, fixed maturities 3,203.0 2,959.8   2,362.1    
Gross unrealized gains, fixed maturities 8.5 25.7   6.0    
Gross unrealized losses, fixed maturities 200.9 160.6   197.2    
Fair value, fixed maturities 3,010.6 2,824.9   2,170.9    
Commercial mortgage-backed securities            
Available-for-sale securities            
Amortized cost, fixed maturities 5,369.1 5,391.6   5,529.7    
Gross unrealized gains, fixed maturities 1.4 1.6   0.9    
Gross unrealized losses, fixed maturities 515.7 649.8   703.1    
Allowance, fixed maturities         0.3 4.3
Fair value, fixed maturities 4,854.8 4,743.4   4,827.5    
Collateralized debt obligations            
Available-for-sale securities            
Amortized cost, fixed maturities 5,815.1 5,379.6   4,698.9    
Gross unrealized gains, fixed maturities 60.8 45.0   4.5    
Gross unrealized losses, fixed maturities 8.2 26.8   143.2    
Allowance, fixed maturities           $ 2.2
Fair value, fixed maturities 5,867.7 5,397.8   4,560.2    
Other debt obligations            
Available-for-sale securities            
Amortized cost, fixed maturities 8,903.9 8,447.2   7,207.8    
Gross unrealized gains, fixed maturities 35.0 42.2   6.0    
Gross unrealized losses, fixed maturities 620.1 602.8   730.4    
Allowance, fixed maturities 0.1 0.1 $ 0.1 0.1 $ 0.1  
Fair value, fixed maturities $ 8,318.7 $ 7,886.5   $ 6,483.3    
[1] See Note 3, Investments, for further details relating to the amortized cost of fixed maturities, available-for-sale.