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Business Combinations - Pro Forma Results of Operation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Business acquisition, pro forma revenue	$ 1,209.0	$ 1,097.2	$ 3,566.0	$ 3,234.4
Business acquisition, pro forma net income	85.7	$ 46.3	$ 266.3	$ 184.3
Hospital Sisters Health System , Covenant Health And Piedmont Healthcare, Inc
Business Acquisition [Line Items]
Business combination, pro forma information, revenue of acquiree since acquisition date, actual	0.0
Business combination, pro forma information, earnings of acquiree since acquisition date, actual	$ 0.0

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