v2.4.0.6

Derivative Financial Instruments (Schedule of Foreign Currency Derivative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Derivative Financial Instruments [Abstract]
CAD Notional	$ 305
Expiration	March 30, 2012
Fixed Rate Received	0.9812
Contract Type	Sell

X

- Definition

The entity's designation of its position on the foreign currency contract being described. This flag can only have the values of "Buy" or "Sell".

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

+ Details

Name:	invest_InvestmentForeignCurrencyContractTransactionTypeFlag
Namespace Prefix:	invest_
Data Type:	invest:foreignCurrencyContractTransactionItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The contractual rate at which a foreign currency can be purchased or sold under the terms of a foreign currency derivative contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeForwardExchangeRate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date when foreign currency exchange rate derivatives mature or expire.

+ References

No definition available.

+ Details

Name:	us-gaap_MaturityOfForeignCurrencyDerivatives
Namespace Prefix:	us-gaap_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

+ Details

Name:	us-gaap_NotionalAmountOfForeignCurrencyDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant