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Derivative Instruments and Hedging Activities (Schedule of Outstanding Interest Rate Derivatives) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2011
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Non-designated [Member] | Interest Rate Cap [Member] |
Number of Instruments | 1
Notional Amount | $ 175.0
Cash Flow Hedging [Member] | Interest Rate Swap [Member] |
Number of Instruments | 1
Notional Amount | 16.6
Non-designated [Member] | Interest Rate Swap [Member] |
Number of Instruments | 1
Notional Amount | $ 500.0

X
- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + Details
Name: | us-gaap_NotionalAmountOfInterestRateDerivatives
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + Details
Name: | us-gaap_NumberOfInterestRateDerivativesHeld
Namespace Prefix: | us-gaap
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant