| **Accounts Receivable**                                           | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Accounts Receivable: [Abstract]**                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Loans, Notes, Trade and Other Receivables Disclosure [Text Block] | Accounts Receivable:Accounts receivable consists of the following (in millions): As of December 31, 2013 2012Current:   Patient accounts receivable, net of allowance for doubtful accounts of $23.1 million in 2013; $28.7 million in 2012$249.4 $231.3Other accounts receivable12.4 18.0 261.8 249.3Noncurrent patient accounts receivable, net of allowance for doubtful accounts of $10.0 million in 201316.6 —Accounts receivable, net$278.4 $249.3During 2013, CMS announced additional delays in the adjudication process of claims that are part of Medicare audit programs. Because the resolution of such claims can take in excess of two years, we review the patient receivables that are part of this adjudication process to determine their appropriate classification as either current or noncurrent. Amounts considered noncurrent are included in Other long-term assets in our consolidated balance sheet. At December 31, 2013 and 2012, our allowance for doubtful accounts represented approximately 11.1% and 11.0%, respectively, of the total patient due accounts receivable balance. The following is the activity related to our allowance for doubtful accounts (in millions):For the Year Ended December 31, Balance at Beginning of Period Additions and Charges to Expense Deductions and Accounts Written Off Balance at End of Period2013 $28.7 $26.0 $(21.6) $33.12012 $21.4 $27.0 $(19.7) $28.72011 $22.7 $21.0 $(22.3) $21.4 |

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| - Definition
The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.
+ References
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