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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Current:    
Patient accounts receivable $ 563.0 $ 498.7
Other accounts receivable 9.8 7.4
Accounts receivable, current 572.8 506.1
Noncurrent patient accounts receivable 123.8 152.1
Accounts receivable $ 696.6 $ 658.2