Acquisitions, Disposals and Deconsolidations - Disposals and Deconsolidations (Details) $ in Millions	9 Months Ended
Sep. 30, 2024 USD ($) surgical_facility	Sep. 30, 2023 USD ($) surgical_facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of equity investments	$ 4.0	$ 1.0
Loss on sale of equity method investment	10.0
Proceeds from disposals of facilities and other assets	$ 1.5	$ 25.8
Surgical Facility, Equity Method Investment \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of interests sold \| surgical_facility	1
Proceeds from sales of equity investments	$ 2.0
Loss on sale of equity method investment	$ 3.7
Surgical Facility With A Retained Interest \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of interests sold \| surgical_facility	1
Proceeds from disposals of facilities and other assets	$ 2.5
Pre-tax gain (loss) on disposal	$ 2.7
Surgical Facility \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of interests sold \| surgical_facility	1
Pre-tax gain (loss) on disposal	$ (3.4)
2023 Disposals \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of interests sold \| surgical_facility		6
Proceeds from disposals of facilities and other assets		$ 30.4
Pre-tax gain (loss) on disposal		26.9
Surgical Facilities and In-Development De Novo Surgical Facilities \| Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of equity investments		1.5
Loss on sale of equity method investment		$ 13.7

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
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-Section 50
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-Subparagraph (c)
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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