Segment Reporting - Schedule of Other Operating Cost and Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting, Measurement Disclosures [Abstract]
Personnel and contract labor-related	$ 141.0	$ 140.2	$ 287.1	$ 287.4
Network-related	55.6	55.2	111.5	109.5
Service-related	63.4	60.9	124.3	121.3
Commercial	41.6	44.7	84.8	90.3
Facility, provision, franchise and other	136.0	138.3	272.1	275.1
Share-based compensation and other Employee Incentive Plan-related expense	12.8	13.3	44.4	47.3
Total other operating costs and expenses	$ 450.4	$ 452.6	$ 924.2	$ 930.9

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

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- Definition

Network-Related Costs

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- Definition

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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- Definition

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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