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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
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