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Accounts Receivable - Components of Accounts Receivable (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Accounts Receivable, Net, Current |  |
Accounts receivable, net of allowance for doubtful accounts of $53.9 in 2016; $39.3 in 2015 | $ 432.0 | $ 403.3
Other accounts receivable | 11.8 | 7.2
Accounts receivable, current | 443.8 | 410.5
Noncurrent patient accounts receivable, net of allowance for doubtful accounts of $49.5 million in 2016; $32.3 million in 2015 | 125.9 | 96.6
Accounts receivable, net | 569.7 | 507.1
Allowance for doubtful accounts receivable, current | 53.9 | 39.3
Allowance for doubtful accounts receivable, noncurrent | $ 49.5 | $ 32.3

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