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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2023
Jun. 30, 2023
Sep. 30, 2024
AON Central      
Variable Interest Entity [Line Items]      
Ownership interest     20.00%
MIBA      
Variable Interest Entity [Line Items]      
Payments to acquire interest in subsidiary $ 0.2 $ 0.2  
Allocation of income to controlling and noncontrolling interests 56.00%    
MIBA | Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Allocation of income to controlling and noncontrolling interests   56.00%  
Physician Owned | AON Central      
Variable Interest Entity [Line Items]      
Ownership interest     80.00%