Segment Reporting - Schedule of Other Operating Cost and Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting, Measurement Disclosures [Abstract]
Personnel and contract labor-related	$ 132.9	$ 135.6	$ 420.0	$ 423.0
Network-related	56.5	51.9	168.0	161.4
Service-related	60.6	62.4	184.9	183.7
Commercial	39.4	45.2	124.2	135.5
Facility, provision, franchise and other	140.4	136.4	412.5	411.5
Share-based compensation and other Employee Incentive Plan-related expense	12.9	15.0	57.3	62.3
Total other operating costs and expenses	$ 442.7	$ 446.5	$ 1,366.9	$ 1,377.4

Facility-Related Costs, Provision For Bad Debt And Franchise-Related Fees

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- Definition

Network-Related Costs

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of expense for salary and wage arising from service rendered by nonofficer and officer employees. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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