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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Current:    
Patient accounts receivable $ 498.7 $ 459.9
Other accounts receivable 7.4 7.8
Accounts receivable, current 506.1 467.7
Noncurrent patient accounts receivable 152.1 155.5
Accounts receivable $ 658.2 $ 623.2