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Long-Term Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Long-term Debt, Fiscal Year Maturity [Abstract]      
Scheduled principal payments on debt remainder of fiscal year   $ 0  
Scheduled principal payments on debt in year one   0  
Scheduled principal payments on debt in year two   0  
Scheduled principal payments on debt in year three   0  
Scheduled principal payments on debt in year four   0  
Scheduled principal payments on debt in year five   0  
Scheduled principal payments on debt thereafter   1,500,000,000  
AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Revolving credit line   450,000,000  
Amount borrowed under revolving credit facility   $ 0 $ 0
AFG | 4.50% Senior Notes due June 2047 | Senior Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Face amount of debt repurchased     $ 15,000,000
Interest rate on debt instruments   4.50% 4.50%
Amount of debt repurchased     $ 13,000,000
AFG | 5.25% Senior Notes due April 2030 | Senior Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Face amount of debt repurchased     $ 3,000,000
Interest rate on debt instruments   5.25% 5.25%
Amount of debt repurchased     $ 3,000,000
SOFR | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility   1.25%  
SOFR | AFG | Minimum      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility 1.00%    
SOFR | AFG | Maximum      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility 1.75%