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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Accounts Receivable, Net, Current    
Accounts receivable, net of allowance for doubtful accounts of $60.9 in 2017; $53.9 in 2016 $ 459.5 $ 432.0
Other accounts receivable 12.6 11.8
Accounts receivable, current 472.1 443.8
Noncurrent patient accounts receivable, net of allowance for doubtful accounts of $52.2 million in 2017; $49.5 million in 2016 129.1 125.9
Accounts receivable, net 601.2 569.7
Allowance for doubtful accounts receivable, current 60.9 53.9
Allowance for doubtful accounts receivable, noncurrent $ 52.2 $ 49.5