Business (Details) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Sep. 20, 2023 $ / shares shares	Jun. 30, 2024 USD ($) state practice $ / shares shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) state practice $ / shares shares	Jun. 30, 2023 USD ($)	Dec. 31, 2023 shares
Business Acquisition [Line Items]
Number of oncology practices | practice		35		35
Number of states in which entity operates | state		20		20
Reverse recapitalization, equity conversion ratio		1		1
Number of securities called by each warrant (in shares)		1		1
Sponsor Earnout Shares
Business Acquisition [Line Items]
Earnout period (in years)	5 years
Percentage of stock subject to vesting (in percent)	0.35
Number of shares subject to vesting (in shares)	2,839,375
Stock price trigger (in usd per share) | $ / shares	$ 13.50
Earnout period, trading days (in days)	20 days
Earnout period, threshold trading day period (in days)	30 days
Earnout period, number of months after closing (in months)	60 months
AON LLC
Business Acquisition [Line Items]
Reverse recapitalization costs | $		$ 0.7	$ 3.3	$ 1.0	$ 5.3
New AON (AON Inc.)
Business Acquisition [Line Items]
Reverse recapitalization costs | $		$ 0.7	$ 3.3	$ 1.0	$ 5.3
Class B Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)		20,571,323		20,571,323		25,109,551
Class A Common Stock
Business Acquisition [Line Items]
Shares issued (in shares)	1,047,343
Common stock, shares outstanding (in shares)		13,495,847		13,495,847		9,517,816
Series A Preferred Stock
Business Acquisition [Line Items]
Stock price (in dollars per share) | $ / shares		$ 10.00		$ 10.00
AON LLC
Business Acquisition [Line Items]
Reverse recapitalization, equity conversion ratio	1
AON LLC | Class B Prefunded Warrants
Business Acquisition [Line Items]
Class of warrant outstanding (in shares)	3,000,245
AON LLC | Class B Common Stock
Business Acquisition [Line Items]
Stock price (in dollars per share) | $ / shares	$ 0.01
AON LLC | Class B Common Stock | Class B Prefunded Warrants
Business Acquisition [Line Items]
Number of securities called by each warrant (in shares)	1
AON LLC | Class A Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)	1,047,343
Digital Transformation Opportunities Corp. (“DTOC”) | Class B Common Stock
Business Acquisition [Line Items]
Reverse recapitalization, equity conversion ratio	1
Legacy AON Shareholders | Class B Prefunded Warrants
Business Acquisition [Line Items]
Class of warrant outstanding (in shares)	3,000,245
Legacy AON Shareholders | AON LLC
Business Acquisition [Line Items]
Common unit, units outstanding (in units)	28,109,796
Legacy AON Shareholders | Class B Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)	25,109,551
New AON (AON Inc.) | AON LLC
Business Acquisition [Line Items]
Common unit, units outstanding (in units)	9,532,354
New AON (AON Inc.) | AON LLC | Series A Preferred Stock
Business Acquisition [Line Items]
Preferred units, outstanding (in units)	6,651,610
DTOC Unredeemed Shareholders | Class A Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)	147,511
DTOC Sponsor | Public Warrant
Business Acquisition [Line Items]
Class of warrant outstanding (in shares)	8,337,500
Warrant, exercise period, after initial public offering	12 months
Warrant, exercise period, after business combination	30 days
Warrant, term (in years)	5 years
DTOC Sponsor | Private Placement Warrants
Business Acquisition [Line Items]
Class of warrant outstanding (in shares)	6,113,333
DTOC Sponsor | Class A Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)	5,498,125
Earnout shares not outstanding (in shares)	2,839,375
Stock price (in dollars per share) | $ / shares	$ 11.50
DTOC Sponsor | Class A Common Stock | Public Warrant
Business Acquisition [Line Items]
Number of securities called by each warrant (in shares)	1
AEA Growth Management LP | Series A Preferred Stock
Business Acquisition [Line Items]
Shares issued (in shares)	6,651,610
Common stock, shares outstanding (in shares)	6,651,610