| **Fair Value Measurements (Details) (USD $)In Millions**                                                                 | 6 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| Swap Four [Member] | Fair Value, Inputs, Level 1 [Member] | Other current assets [Member]                                | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair market value of swap, Assets                                                                                        | Â              |                 | $ 0 |  |
| Swap One [Member] | Fair Value, Inputs, Level 1 [Member] | Accrued expenses and other current [Member]                   | Â              |                 | Â |  |
| **Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]**                       | Â              |                 | Â |  |
| Fair market value of swap, Liabilities                                                                                   | Â              |                 | 0 |  |
| Fair Value, Inputs, Level 1 [Member] | Restricted marketable securities [Member] | Other current assets [Member]         | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 0              |                 | 0 |  |
| Fair Value, Inputs, Level 1 [Member] | Restricted marketable securities [Member] | Other long term assets [Member]       | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 0              |                 | 0 |  |
| Swap Four [Member] | Fair Value, Inputs, Level 2 [Member] | Other current assets [Member]                                | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair market value of swap, Assets                                                                                        | Â              |                 | 1.2 |  |
| Swap One [Member] | Fair Value, Inputs, Level 2 [Member] | Accrued expenses and other current [Member]                   | Â              |                 | Â |  |
| **Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]**                       | Â              |                 | Â |  |
| Fair market value of swap, Liabilities                                                                                   | Â              |                 | (12.1) |  |
| Fair Value, Inputs, Level 2 [Member] | Restricted marketable securities [Member] | Other current assets [Member]         | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 22.0           |                 | 18.2 |  |
| Fair Value, Inputs, Level 2 [Member] | Restricted marketable securities [Member] | Other long term assets [Member]       | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 23.7           |                 | 19.3 |  |
| Swap Four [Member] | Fair Value, Inputs, Level 3 [Member] | Other current assets [Member]                                | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair market value of swap, Assets                                                                                        | Â              |                 | 0 |  |
| Swap One [Member] | Fair Value, Inputs, Level 3 [Member] | Accrued expenses and other current [Member]                   | Â              |                 | Â |  |
| **Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]**                       | Â              |                 | Â |  |
| Fair market value of swap, Liabilities                                                                                   | Â              |                 | 0 |  |
| Fair Value, Inputs, Level 3 [Member] | Restricted marketable securities [Member] | Other current assets [Member]         | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 0              |                 | 0 |  |
| Fair Value, Inputs, Level 3 [Member] | Restricted marketable securities [Member] | Other long term assets [Member]       | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 0              |                 | 0 |  |
| Restricted marketable securities [Member] | Other current assets [Member]                                                | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 22.0           |                 | 18.2 |  |
| Fair Value, Assets Measured on Recurring Basis, Investments, Valuation Techniques                                        | M              | [1]             | M | [1] |
| Restricted marketable securities [Member] | Other long term assets [Member]                                              | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair Value, Measured on Recurring Basis, Investments                                                                     | 23.7           |                 | 19.3 |  |
| Fair Value, Assets Measured on Recurring Basis, Investments, Valuation Techniques                                        | M              | [1]             | M | [1] |
| Swap One [Member] | Accrued expenses and other current [Member]                                                          | Â              |                 | Â |  |
| **Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]**                       | Â              |                 | Â |  |
| Fair market value of swap, Liabilities                                                                                   | Â              |                 | (12.1) |  |
| Fair Value, Liabilities Measured on Recurring Basis, Derivative Financial Instruments, Liabilities, Valuation Techniques | Â              |                 | I | [1] |
| Swap Four [Member] | Other current assets [Member]                                                                       | Â              |                 | Â |  |
| **Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]**                            | Â              |                 | Â |  |
| Fair market value of swap, Assets                                                                                        | Â              |                 | $ 1.2 |  |
| Fair Value, Assets Measured on Recurring Basis, Derivative Financial Instruments, Assets, Valuation Techniques           | Â              |                 | I | [1] |
|                                                                                                                          |
| [1]The three valuation techniques are: market approach (M), cost approach (C), and income approach (I).                  |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a
+ Details**Name:**us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets**Namespace Prefix:**us-gaap**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, 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
+ Details**Name:**us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssetsValuationTechniques**Namespace Prefix:**us-gaap**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ Details**Name:**us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems**Namespace Prefix:**us-gaap**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, 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
+ Details**Name:**us-gaap_FairValueAssetsMeasuredOnRecurringBasisInvestmentsValuationTechniques**Namespace Prefix:**us-gaap**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a
+ Details**Name:**us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities**Namespace Prefix:**us-gaap**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents, for annual periods only, the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, 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
+ Details**Name:**us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilitiesValuationTechniques**Namespace Prefix:**us-gaap**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ Details**Name:**us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems**Namespace Prefix:**us-gaap**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a
+ Details**Name:**us-gaap_FairValueMeasuredOnRecurringBasisInvestments**Namespace Prefix:**us-gaap**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |