v3.25.2
Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
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 253,000,000  
Scheduled principal payments on debt thereafter $ 1,250,000,000  
Variable interest rate on debt instrument Secured Overnight Financing Rate (SOFR) [Member]  
AFG    
Long-term Debt, Fiscal Year Maturity [Abstract]    
Revolving credit line $ 450,000,000  
Interest rate on revolving debt facility 1.25%  
Amount borrowed under revolving credit facility $ 0 $ 0
AFG | Minimum    
Long-term Debt, Fiscal Year Maturity [Abstract]    
Interest rate on revolving debt facility 1.00%  
AFG | Maximum    
Long-term Debt, Fiscal Year Maturity [Abstract]    
Interest rate on revolving debt facility 1.75%