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Acquisitions and Disposals - Acquisitions (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) facility	Mar. 31, 2022 USD ($) facility	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired	$ 40.7	$ 31.1
Goodwill	4,217.3		$ 4,137.1
Payments to acquire equity method investments	9.6	0.0
Surgical Facility and Physician Practice
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired	16.2
Noncash consideration	1.3
Recognized non-controlling interests	12.0
Goodwill	25.7
Surgical Facilities
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired	24.5	31.1
Noncash consideration		2.6
Recognized non-controlling interests	34.2	10.6
Goodwill	$ 65.6	$ 42.7
Number of facilities acquired | facility	2	2
Non-controlling interest, fair value			$ 8.3
Net (loss) gain on fair value of non-controlling interest	$ 2.9
Existing Surgical Facility
Business Acquisition [Line Items]
Payments to acquire equity method investments	12.4
Payments for acquisitions, deferred	$ 2.8
Surgical Facilities, Existing Markets
Business Acquisition [Line Items]
Number of facilities acquired | facility		1

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