v3.25.4
Cash and Investments - Fixed Income Maturity Profile (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cash and Investments    
Amount of bonds $ 39,988.8 $ 37,390.3
Eurolife Life Operations    
Cash and Investments    
Amount of bonds 1,403.8  
Due after 1 year through 5 years    
Cash and Investments    
Investments in first mortgage loans secured by real estate 5,402.5 4,777.8
Due after 1 year through 3 years    
Cash and Investments    
Investments in U.S. Treasury Bonds 7,372.2 1,379.4
Due after 3 years through 5 years    
Cash and Investments    
Investments in U.S. Treasury Bonds 11,575.7 2,314.5
Between 5 to 7 years    
Cash and Investments    
Investments in U.S. Treasury Bonds 372.1 10,222.4
Between 28 to 30 years    
Cash and Investments    
Investments in U.S. Treasury Bonds 0.9 1,204.7
Interest rate risk | Interest rate swaps    
Cash and Investments    
Notional amount 0.0 1,900.0
Interest rate risk | Forward contracts to buy long-dated U.S. treasury bonds    
Cash and Investments    
Notional amount   1,330.2
Interest rate risk | Forward contracts to sell long-dated U.S. treasury bonds    
Cash and Investments    
Notional amount 246.6 0.0
Bonds    
Cash and Investments    
Bonds with call features 8,766.5 9,657.6
Bonds with put features 671.3 148.9
Bonds with call and put features 5.7 448.1
Amortized cost 40,571.6 38,721.1
Fair value $ 40,758.7 $ 38,235.5
Effective interest rate 5.40% 5.20%
Bonds | 1 year or less    
Cash and Investments    
Amortized cost $ 9,473.6 $ 9,324.8
Fair value 9,182.3 9,117.2
Bonds | Due after 1 year through 3 years    
Cash and Investments    
Amortized cost 13,652.3 8,110.9
Fair value 13,720.5 7,975.6
Bonds | Due after 3 years through 5 years    
Cash and Investments    
Amortized cost 14,796.8 6,939.6
Fair value 15,196.6 7,004.5
Bonds | Due after 5 years through 10 years    
Cash and Investments    
Amortized cost 2,233.2 12,309.6
Fair value 2,225.4 12,273.6
Bonds | Due after 10 years    
Cash and Investments    
Amortized cost 415.7 2,036.2
Fair value 433.9 $ 1,864.6
U.S Treasury bonds | Due after 1 year through 3 years    
Cash and Investments    
Net purchases 5,740.5  
U.S Treasury bonds | Due after 5 years through 10 years    
Cash and Investments    
Net sales and maturities 431.0  
U.S Treasury bonds | Due after 10 years    
Cash and Investments    
Net sales and maturities 1,173.2  
Corporate and other | Due after 1 year through 3 years    
Cash and Investments    
Net purchases 994.5  
Corporate and other | Due after 5 years through 10 years    
Cash and Investments    
Net sales and maturities 291.9  
Bonds, Other government | Due after 5 years through 10 years    
Cash and Investments    
Net purchases 917.9  
Canadian government bonds | Due after 1 year through 3 years    
Cash and Investments    
Net purchases $ 561.6