| **Contingencies and Other Commitments - Textual (Details) (USD $)**                                                   |             | 3 Months Ended  | 12 Months Ended |            | 12 Months Ended | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------|-------------|-----------------|-----------------|------------|-----------------|----------------|-----------------|
||
| **Loss Contingencies [Line Items]**                                                                                   |        |            |            |       |            |           |            |   |   |   |   |   |
| Litigation Settlement, Gross                                                                                          |        | $ 2,900,000,000 |            |       |            |           |            |   |   |   |   |   |
| Gain (Loss) Related to Litigation Settlement                                                                          |        |            | 3,500,000       | 12,300,000 |            |           |            |   |   |   |   |   |
| Net Recoveries, Percentage Owed to Federal Plaintiffs                                                                 |        |            |            |       | 25.00%          |           |            |   |   |   |   |   |
| Net Recoveries, Percentage Owed to Derivative Litigation Attorneys                                                    |        |            |            |       | 35.00%          |           |            |   |   |   |   |   |
| Litigation Settlement, Expense                                                                                        |        |            | 1,400,000       | 5,200,000  |            |           |            |   |   |   |   |   |
| Long-term Purchase Commitment, Time Period                                                                            |        |            |            |       |            |           | three years     |   |   |   |   |   |
| Consent Judgment Awarded to Plaintiff                                                                                 |        |            |            |       |            | 376,000,000    |            |   |   |   |   |   |
| Annual Percentage Rate                                                                                                |        |            |            |       |            | 10.00%         |            |   |   |   |   |   |
| Loss Contingency, Litigation Settlement, Consideration                                                                |        |            |            |       |            | 300,000        |            |   |   |   |   |   |
| Damages Awarded, Plaintiff                                                                                            |        |            |            |       |            |           |            | 12,300,000 |   |   |   |   |
| Loss Contingency, Liability Recorded, Current                                                                         |        |            |            |       |            |           |            |   | 12,300,000 |   |   |   |
| Loss Contingency, Receivable Recorded, Current                                                                        |        |            |            |       |            |           |            |   | 7,700,000 |   |   |   |
| Loss Contingency, Loss in Period                                                                                      |        |            |            |       |            |           |            |   |   | 4,600,000 |   |   |
| Loss Contingency, Payments                                                                                            |        |            |            |       |            |           |            |   | 6,000,000 |   |   |   |
| Gain Related to Settlement, Audits of Unclaimed Property                                                              |        |            |            |       |            |           |            |   |   |   |   | 25,300,000 |
| Gain Related to Settlement, Audits of Unclaimed Property, Included in Income from Discontinued Operations, Net of Tax |        |            |            |       |            |           |            |   |   |   | 24,800,000 | 24,800,000 |
| Purchase Obligations, Due Within One Year                                                                             | 27,800,000  |            |            |       |            |           |            |   |   |   |   |   |
| Purchase Obligations, Due within Two Years                                                                            | 22,300,000  |            |            |       |            |           |            |   |   |   |   |   |
| Purchase Obligations, Due Within Three Years                                                                          | 24,300,000  |            |            |       |            |           |            |   |   |   |   |   |
| Purchase Obligations, Due Within Four Years                                                                           | 21,700,000  |            |            |       |            |           |            |   |   |   |   |   |
| Purchase Obligations, Due Within Five Years                                                                           | 10,700,000  |            |            |       |            |           |            |   |   |   |   |   |
| Purchase Obligations, Due After Five Years                                                                            | 32,800,000  |            |            |       |            |           |            |   |   |   |   |   |
| Severance Agreements, Due Within One Year                                                                             | 200,000     |            |            |       |            |           |            |   |   |   |   |   |
| Severance Agreements, Due Within Two Years                                                                            | 200,000     |            |            |       |            |           |            |   |   |   |   |   |
| Severance Agreements, Due Within Three Years                                                                          | 200,000     |            |            |       |            |           |            |   |   |   |   |   |
| Severance Agreements, Due Within Four Years                                                                           | 200,000     |            |            |       |            |           |            |   |   |   |   |   |
| Severance Agreement, Due Within Five Years                                                                            | 200,000     |            |            |       |            |           |            |   |   |   |   |   |
| Severance Agreements, Due After Five Years                                                                            | $ 2,400,000 |            |            |       |            |           |            |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The rate per annum at which interest is charged on the balance of an outstanding liability, debt agreement, contract, etc.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                              |
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| - Definition
Consent judgment awarded to General Medicine against Horizon/CMS for the alleged wrongful termination of a contract to provide medical director services to skilled nursing facilities.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This represents the amount of income recognized in the period to settle audits of unclaimed property.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of income recognized in the period to settle audits of unclaimed property that is included in income from discontinued operations, net of tax.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of damages awarded to the plaintiff resulting from litigation.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
The amount of consideration to which the entity agreed to pay in a settlement agreement which resolved the matter.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| - Definition
The amount owed to the attorneys for the derivative shareholders plaintiffs as part of the Consolidated Securities Action settlement agreement and expressed as a percentage of any net recoveries received from any future judgments obtained by the Company with respect to certain claims against the Company's former CEO.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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| - Definition
The amount owed to the federal plaintiffs as part of the Consolidated Securities Action settlement agreement and expressed as a percentage of any net recoveries received from any future judgments obtained by the Company with respect to certain claims against the Company's former CEO.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amounts due under severance agreements with former employees after five years.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Amounts due under severance agreements with former employees within five years.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                         |
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| - Definition
Amounts due under severance agreements with former employees within four years.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amounts due under severance agreements with former employees within one year.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amounts due under severance agreements with former employees within three years.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                       |
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| - Definition
Amounts due under severance agreements with former employees within two years.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) estimated litigation  liability extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the expenses incurred by the entity which are directly related and attributable to receiving an award in settlement of litigation.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.
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No definition available.
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| X                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Specifies the time period covered by the arrangement.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of the carrying amount as of the balance sheet date of the combined total of loss contingency liabilities which is expected to be resolved within one year or the normal operating cycle, if longer.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The payments made in the period which reduced loss contingency liabilities.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of the carrying amount as of the balance sheet date of a recorded 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 to the extent that the insurance recovery is probable and does not exceed the amount of the loss previously recognized in the financial statements.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the four fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 7 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year.
+ References
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