Significant Accounting Policies - Narrative (Details) store in Thousands, people in Millions, patient in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) people clinic Segment state store patient	Mar. 31, 2023 USD ($)	Dec. 31, 2023 business
Significant Accounting Policies [Line Items]
Number of pharmacy plan members | people	90
Number of patients served per year (more than) | patient	0.8
Number of reportable segments | Segment	4
Number of businesses acquired | business			2
Client Health Information Network Services, Fees Expensed
Significant Accounting Policies [Line Items]
Transactions with related party | $	$ 6	$ 17
Pharmacy & Consumer Wellness
Significant Accounting Policies [Line Items]
Number of retail locations (more than) | store	9
Health Services
Significant Accounting Policies [Line Items]
Number of walk in medical clinics (more than) | clinic	1,000
Number of primary care medical clinics | clinic	205
Health Care Benefits
Significant Accounting Policies [Line Items]
Number of people served (more than) | people	36
Number of states in which the Company has entered the individual public health insurance exchange | state	17