Contingencies Contingencies (Details)	9 Months Ended
	Sep. 30, 2021
NextGen [Member]
Loss Contingencies [Line Items]
Loss Contingency, Settlement Agreement, Terms	Cerner Health Services, Inc. ("Cerner HS"), a wholly owned subsidiary of Cerner Corporation, filed a lawsuit in the Chester County, Pennsylvania, Court of Common Pleas against NextGen Healthcare Information Systems, LLC ("NextGen") relating to a dispute arising out of a supplier relationship initially established between Siemens Health Services, Inc. and NextGen prior to the acquisition of the assets of Siemens Health Services, Inc. by Cerner HS in 2015. The parties have settled the matter, and Cerner did not incur a significant loss.
Steward Health Care System LLC
Loss Contingencies [Line Items]
Loss Contingency, Management's Assessment and Process	On May 16, 2019, Steward Health Care System LLC ("Steward") filed a lawsuit in the Chancery Court for Davidson County, Tennessee against the Company alleging $210 million in damages. The Company believes Steward's allegations arise out of Steward's disinterest in following the contract between the Company and Steward's predecessor for clinical and financial software and services after Steward closed on its acquisition of the predecessor. The Company has filed a counterclaim against Steward seeking recovery of more than $42 million in unpaid invoices owed to the Company. The Company believes the dispute is in the ordinary course of business and the damages Steward asserts lack both factual and causal support. We have not concluded that a material loss related to the Steward allegations is probable, nor have we accrued a liability related to these claims. Although we believe a loss could be reasonably possible (as defined in ASC 450), we do not have sufficient information to determine the amount or range of reasonably possible loss with respect to the potential damages given that the dispute is in the discovery process. We will continue to vigorously defend against these claims, and we continue to believe that we have valid grounds for recovery of the disputed client receivables. However, there can be no assurances as to the outcome of the dispute.
Astria Health
Loss Contingencies [Line Items]
Loss Contingency, Management's Assessment and Process	On March 22, 2021, Astria Health ("Astria") filed an adversary proceeding in the United States Bankruptcy Court, Eastern District of Washington against the Company. Astria's allegations largely arise out of the Company's provision of revenue cycle services in 2018 and 2019. The Company believes the dispute is in the ordinary course of business and the factual allegations and the damages asserted lack both factual and causal support. We have not concluded that a material loss related to the Astria allegations is probable, nor have we accrued a liability related to these claims beyond reserving certain bankruptcy-related outstanding invoices. Although we believe a loss could be reasonably possible (as defined in ASC 450), we do not have sufficient information to determine the amount or range of reasonably possible loss with respect to the potential damages given that the dispute is in the early stages of the discovery process. We will continue to vigorously defend against this claim. However, there can be no assurances as to the outcome of the dispute.