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Contingencies and Other Commitments (Details) - Pending Litigation [Member] $ in Millions		9 Months Ended	12 Months Ended
	May 18, 2016 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2018 USD ($)	Feb. 28, 2015 patient	Apr. 24, 2014 facilities	Aug. 12, 2013 facilities	Mar. 04, 2013 facilities patient
Honts lawsuit [Member]
Loss Contingencies [Line Items]
Number of hospitals involved in lawsuit | facilities							1
Punitive damages awarded in favor of plaintiff	$ 20.0
Other operating expenses			$ 5.7
Loss contingency accrual				$ 20.1
Loss contingency receivable accrued				$ 15.5
Portion of liability that would be covered through captive insurance subsidiary		$ 6.0
HHS-OIG Investigation [Member]
Loss Contingencies [Line Items]
Number of hospitals that received subpoenas | facilities						7		4
Number of patient medical records requested for each hospital in subpoenas | patient								100
Number of hospitals that received supplemental subpoenas | facilities						2
Number of additional patient medical records requested | patient					70
Compliance threshold under Health Care Act (percent)		60.00%

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- Definition

Compliance threshold under the Medicare, Medicaid, and State Children's Health Insurance Program (SCHIP) Extension Act of 2007 as of the balance sheet date.

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Number of patient medical records requested for each hospital in subpoenas.

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Number of additional patient medical records requested.

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The specific number of hospitals involved in a particular lawsuit.

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Number of hospitals that received subpoenas in connection with an investigation of alleged improper or fraudulent claims submitted to Medicare and Medicaid.

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Number of hospitals that received supplemental subpoenas to cover the new time period of January 2008 through December 2013

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Amount of loss contingency liability.

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Amount of damages awarded to the plaintiff in the legal matter.

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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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Amount of receivable related to a loss contingency accrual that is expected to be collected within one year or the normal operating cycle, if longer. For example, an insurance recovery receivable.

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Maximum coverage per malpractice claim provided by the insurance arrangement.

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