Acquisitions and Disposals	12 Months Ended
Acquisitions and Disposals	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Disposals	Acquisitions and Dispositions The Company accounts for all transactions that represent business combinations using the acquisition method of accounting, where the identifiable assets acquired, liabilities assumed and any non-controlling interest in the acquired entity are recognized and measured at their fair values on the date the Company obtains control in the acquiree. The fair values assigned to certain assets acquired and liabilities assumed that are not finalized for reporting periods following the acquisition date are estimated on a preliminary basis and are subject to adjustment as new facts and circumstances emerge that were present at the date of acquisition. Such adjustments are recorded as soon as practical and within the measurement period (defined as the date through which all information required to identify and measure the consideration transferred, assets acquired, liabilities assumed and any non-controlling interests has been obtained, limited to one year from the acquisition date). Goodwill is determined as the excess of the fair value of the consideration conveyed plus the fair value of any non-controlling interests in the acquisition over the fair value of the net assets acquired. Acquisitions During the year ended December 31, 2022, the Company acquired controlling interests in seven surgical facilities, two of which were merged into existing facilities, and a physician practice for aggregate cash consideration of $146.4 million, net of cash acquired, non-cash consideration of $5.6 million and assumed debt of $39.4 million. The non-cash consideration consisted of a non-controlling interest in two of the Company's existing surgical facilities. In connection with the acquisitions, the Company preliminarily recognized non-controlling interests of $89.1 million and goodwill of $271.7 million. During the year ended December 31, 2021, the Company acquired controlling interests in eight surgical facilities, two of which were merged into existing facilities, and two physician practices for aggregate cash consideration of $285.8 million, net of cash acquired. In connection with the acquisitions, the Company preliminarily recognized non-controlling interests of $185.9 million and goodwill of $446.1 million. During the year ended December 31, 2022, no significant changes were made to the purchase price allocation of assets and liabilities, existing at the date of acquisition, related to individual acquisitions completed in 2021. Other Acquisitions During the year ended December 31, 2022, the Company acquired non-controlling interests in seven surgical facilities and seven in-development de novo surgical facilities for an aggregate cash purchase price of $95.1 million. The non-controlling interests were accounted for as equity method investments and recorded as a component of investments in and advances to affiliates in the accompanying consolidated balance sheets. Disposals and Deconsolidations During the year ended December 31, 2022, the Company sold its interests in two surgical facilities, one of which was previously accounted for as an equity method investment, for net cash proceeds of $25.7 million. In connection with the sales, the Company recognized a pre-tax loss of $4.5 million included in loss on disposals and deconsolidations, net in the consolidated statements of operations for the year ended December 31, 2022. During the year ended December 31, 2022, the Company contributed its interests in two surgical facilities as non-cash consideration for non-controlling interests in two new separate entities. As a result of these transactions, the Company lost control of the previously controlled surgical facilities but retains a non-controlling interest in each, resulting in the deconsolidation of the previously consolidated entities. The remaining non-controlling interests were accounted for as equity method investments, and initially measured and recorded at fair value as of the dates of the transactions. The fair value measurement utilizes Level 3 inputs, which includes unobservable data, to measure the fair value of the retained non-controlling interests. The fair value determination was based on a combination of multiple valuation methods, which included discounted cash flow and market value approach, which incorporates estimates of future earnings and market valuation multiples for certain guideline companies. The fair value of the investments of $9.8 million was recorded as a component of investments in and advances to affiliates in the accompanying consolidated balance sheets. The transactions resulted in a pretax net loss on deconsolidations of $5.6 million, which is included in loss on disposals and deconsolidations, net, in the accompanying consolidated statements of operations for the year ended December 31, 2022. The net loss was determined based on the difference between the fair value of the Company's retained interests in the entities and the carrying values of both the tangible and intangible assets of the entities immediately prior to the transactions. During the year ended December 31, 2021, the Company sold its interests in three surgery centers, one physician practice and certain other assets for combined net cash proceeds of $6.0 million. In connection with the sales, the Company recognized a net pre-tax gain of $4.0 million included in loss on disposals and deconsolidations, net in the consolidated statements of operations for the year ended December 31, 2021. During the year ended December 31, 2020, the Company sold its interests in three surgery centers, one of which was previously accounted for as an equity method investment, sold certain assets related to its anesthesia business, certain imaging assets and its optical products purchasing organization for combined net cash proceeds of $58.5 million. In connection with the sales, the Company recognized a net pre-tax gain of $5.2 million included in loss on disposals and deconsolidations, net in the consolidated statements of operations for the year ended December 31, 2020. Additionally, the Company closed its diagnostic laboratory and recognized a net pre-tax loss of $3.5 million included in loss on disposals deconsolidations, net in the consolidated statements of operations for the year ended December 31, 2020.