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Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,263.2 | $ 1,237.0 | $ 1,228.2 | $ 1,218.9
Altru Health System, Trinity Medical Center And NCH Healthcare System |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 26.2 |  |  |
Total assets acquired | 27.1 |  |  |
Shannon Medical, Heritage Valley & ECHD Ventures |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 8.8 |  |
Other long-term assets |  | 0.1 |  |
Total assets acquired |  | 10.2 |  |
Portercare Adventist and Premier Health Partners |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | 9.3 |
Total assets acquired |  |  | 10.9 |
Noncompete agreements | Altru Health System, Trinity Medical Center And NCH Healthcare System |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Identifiable intangible assets | $ 0.9 |  |  |
Noncompete agreements | Shannon Medical, Heritage Valley & ECHD Ventures |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Identifiable intangible assets |  | 1.0 |  |
Noncompete agreements | Portercare Adventist and Premier Health Partners |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Identifiable intangible assets |  |  | 0.7 |
Trade Names | Shannon Medical, Heritage Valley & ECHD Ventures |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Identifiable intangible assets |  | $ 0.3 |  |
Finite-lived intangible asset useful life |  | 20 years |  |
Trade Names | Portercare Adventist and Premier Health Partners |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Identifiable intangible assets |  |  | $ 0.9 |
Finite-lived intangible asset useful life |  |  | 20 years |
Minimum | Noncompete agreements | Altru Health System, Trinity Medical Center And NCH Healthcare System |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset useful life | 2 years |  |  |
Minimum | Noncompete agreements | Shannon Medical, Heritage Valley & ECHD Ventures |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset useful life |  | 3 years |  |
Minimum | Noncompete agreements | Portercare Adventist and Premier Health Partners |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset useful life |  |  | 2 years |
Maximum | Noncompete agreements | Altru Health System, Trinity Medical Center And NCH Healthcare System |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset useful life | 3 years |  |  |
Maximum | Noncompete agreements | Shannon Medical, Heritage Valley & ECHD Ventures |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset useful life |  | 5 years |  |
Maximum | Noncompete agreements | Portercare Adventist and Premier Health Partners |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset useful life |  |  | 3 years |

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