| **Fair Value Measurements - Table 1 (Details) (USD $)In Millions, unless otherwise specified**                                                                            | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| Restricted Marketable Securities [Member]                                                                                                                                 |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | $ 15.0          | $ 18.2 |
| Fair Value, Investments, Valuation Techniques                                                                                                                             | M               | M |
| Restricted Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]                                                                                          |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | 0               | 0 |
| Restricted Marketable Securities [Member] | Fair Value, Inputs, Level 2 [Member]                                                                                          |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | 15.0            | 18.2 |
| Restricted Marketable Securities [Member] | Fair Value, Inputs, Level 3 [Member]                                                                                          |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | 0               | 0 |
| Restricted Marketable Securities [Member] | Other Long Term Assets [Member]                                                                                               |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | 30.2            | 19.3 |
| Fair Value, Investments, Valuation Techniques                                                                                                                             | M               | M |
| Restricted Marketable Securities [Member] | Other Long Term Assets [Member] | Fair Value, Inputs, Level 1 [Member]                                                        |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | 0               | 0 |
| Restricted Marketable Securities [Member] | Other Long Term Assets [Member] | Fair Value, Inputs, Level 2 [Member]                                                        |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | 30.2            | 19.3 |
| Restricted Marketable Securities [Member] | Other Long Term Assets [Member] | Fair Value, Inputs, Level 3 [Member]                                                        |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Available-for-sale Securities, Fair Value                                                                                                                                 | 0               | 0 |
| June 2009 Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]                                                                                |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Assets, Fair Value                                                                                                                                   |            | 1.2 |
| Fair Value, Derivative Financial Instruments, Assets, Valuation Techniques                                                                                                |            | I |
| June 2009 Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Inputs, Level 1 [Member]                                         |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Assets, Fair Value                                                                                                                                   |            | 0 |
| June 2009 Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member]                                         |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Assets, Fair Value                                                                                                                                   |            | 0 |
| March 2006 Interest Rate Swap [Member] | Other Current Liabilities [Member]                                                                                               |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Liabilities, Fair Value                                                                                                                              |            | (12.1) |
| Fair Value, Derivative Financial Instruments, Liabilities, Valuation Techniques                                                                                           |            | I |
| March 2006 Interest Rate Swap [Member] | Other Current Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]                                                        |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Liabilities, Fair Value                                                                                                                              |            | 0 |
| March 2006 Interest Rate Swap [Member] | Other Current Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]                                                        |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Liabilities, Fair Value                                                                                                                              |            | 0 |
| June 2009 Interest Rate Swap [Member]                                                                                                                                     |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Assets, Fair Value                                                                                                                                   |            | 1.2 |
| June 2009 Interest Rate Swap [Member] | June 2009 Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member] |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Assets, Fair Value                                                                                                                                   |            | 1.2 |
| March 2006 Interest Rate Swap [Member]                                                                                                                                    |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Liabilities, Fair Value                                                                                                                              |            | (12.1) |
| March 2006 Interest Rate Swap [Member] | March 2006 Interest Rate Swap [Member] | Other Current Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]               |            |   |
| **Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]**                                                                                             |            |   |
| Interest Rate Swaps, Liabilities, Fair Value                                                                                                                              |            | $ (12.1) |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.
+ References
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| X                                                                                                                                                                                                 |
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents, the inputs and valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques and related inputs, if any, during the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph e -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.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents, the inputs and valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques and related inputs, if any, during the period.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents, the inputs and valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques and related inputs, if any, during the period.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611
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