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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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

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