| **Contingencies and Other Commitments - Textual (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended | 3 Months Ended | 12 Months Ended |           | 12 Months Ended          | 3 Months Ended | 12 Months Ended |        |
|------------------------------------------------------------------------------------------------------------|-----------------|----------------|-----------------|-----------|--------------------------|----------------|-----------------|--------|
||
| **Loss Contingencies [Line Items]**                                                                        |            |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Litigation Settlement, Gross                                                                               | $ 0             | $ 0            | $ (100.0)       | $ 2,900.0 |                     |           |            |   |   |   |   |   |   |   |
| Litigation, Damages Sought                                                                                 |            |           |            |      | in excess of $70 million |           |            |   |   |   |   |   |   |   |
| Net Recoveries, Percentage Owed to Federal Plaintiffs                                                      |            |           |            |      |                     |           |            |   | 25.00% |   |   |   |   |   |
| Gain (Loss) Related to Litigation Settlement                                                               |            |           |            |      |                     | 12.3           | 6.5             |   |   |   |   |   |   |   |
| Net Recoveries, Percentage Owed to Derivative Litigation Attorneys                                         |            |           |            |      |                     |           |            |   | 35.00% |   |   |   |   |   |
| Litigation Settlement, Expense                                                                             |            |           |            |      |                     | 5.2            |            |   |   |   |   |   |   |   |
| Long-term Purchase Commitment, Time Period                                                                 |            |           |            |      |                     |           |            |   |   |   | three years |   |   |   |
| Consent Judgment Awarded to Plaintiff                                                                      |            |           |            |      |                     |           |            |   |   | 376 |   |   |   |   |
| Damages Awarded, Plaintiff                                                                                 |            |           |            |      |                     |           |            |   |   |   |   | 12.3 |   |   |
| Loss Contingency, Liability Recorded, Current                                                              |            |           |            |      |                     |           |            |   |   |   |   |   | 12.3 | 12.3 |
| Loss Contingency, Receivable Recorded, Current                                                             |            |           |            |      |                     |           |            |   |   |   |   |   | 7.7 | 7.7 |
| Loss Contingency, Loss in Period                                                                           |            |           |            |      |                     |           |            | 215.0  |   |   |   |   | 4.6 |   |
| Loss Contingency, Payments                                                                                 |            |           |            |      |                     |           |            |   |   |   |   |   | 6.0 |   |
| Purchase Obligations, Due Within One Year                                                                  | 23.2            |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Purchase Obligations, Due Within Two Years                                                                 | 23.0            |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Purchase Obligations, Due Within Three Years                                                               | 18.7            |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Purchase Obligations, Due Within Four Years                                                                | 22.3            |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Purchase Obligations, Due Within Five Years                                                                | 20.3            |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Purchase Obligations, Due After Five Years                                                                 | 43.0            |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Severance Agreements, Due Within One Year                                                                  | 0.2             |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Severance Agreements, Due Within Two Years                                                                 | 0.2             |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Severance Agreements, Due Within Three Years                                                               | 0.2             |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Severance Agreements, Due Within Four Years                                                                | 0.2             |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Severance Agreement, Due Within Five Years                                                                 | 0.2             |           |            |      |                     |           |            |   |   |   |   |   |   |   |
| Severance Agreements, Due After Five Years                                                                 | $ 2.4           |           |            |      |                     |           |            |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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| X                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of damages awarded to the plaintiff resulting from litigation.
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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.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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| X                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amounts due under severance agreements with former employees after five years.
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Amounts due under severance agreements with former employees within five years.
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Amounts due under severance agreements with former employees within four years.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amounts due under severance agreements with former employees within one year.
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| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amounts due under severance agreements with former employees within three years.
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Amounts due under severance agreements with former employees within two years.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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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.
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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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| X                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Specifies the time period covered by the arrangement.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The payments made in the period which reduced loss contingency liabilities.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Describes the form and magnitude of the award the plaintiff seeks in the legal matter, which may include an unspecified amount of money.
+ References
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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.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than four and within five years from the balance sheet date.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid within one year of the balance sheet date.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than three and within four years from the balance sheet date.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than one and within two years from the balance sheet date.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than two and within three years from the balance sheet date.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid after five years from the balance sheet date.
+ References
No definition available.
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