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Derivative Instruments and Hedging Activities (Fair Value of Derivative Financial Instruments and their Classification in the Balance Sheet) (Details) (USD $) | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Interest Rate Cap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | $ 0 | $ 0
Derivatives designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | 100,000.0 | 36,900,000
Derivatives not designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives, Fair Value | $ 27,900,000 |

X
- Definition Fair value of a derivative asset that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of a derivative liability (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration