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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Schedule of Accounts Receivable, Net, Current    
Patient accounts receivable $ 459.9 $ 459.5
Other accounts receivable 7.8 12.6
Accounts receivable, current 467.7 472.1
Noncurrent patient accounts receivable 155.5 129.1
Accounts receivable $ 623.2 $ 601.2