The stated principal amount of the debt instrument at time of issuance being hedged.

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- Definition

Interest rate on the hedged portion of the debt agreement considering the effect of the interest rate swap at the end of the period.

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- Definition

Derivatives.

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Assertion that the amount of foreign currency cash flow hedge ineffectiveness is immaterial.

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- Definition

Aggregate notional amount of all foreign currency derivatives designated as hedging instruments in cash flow hedges. 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
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

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- Definition

Aggregate notional amount of all interest rate derivatives designated as hedging instruments in fair value hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

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Derivatives (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 250 million unsecured medium-term notes due March 2013 [Member]	Feb. 29, 2008 250 million unsecured medium-term notes due March 2013 [Member]	Jun. 30, 2011 350 million unsecured medium-term notes due March 2015 [Member]	Feb. 28, 2011 350 million unsecured medium-term notes due March 2015 [Member]	Jun. 30, 2011 350 million unsecured medium-term notes due June 2017 [Member]	May 31, 2011 350 million unsecured medium-term notes due June 2017 [Member]	Feb. 29, 2008 Interest rate swaps maturing March 2013 [Member]
Derivatives (Textuals) [Abstract]
Interest rate on fixed-rate debt including the effect of the interest rate swap			2.59%		1.42%		1.50%
Face amount of unsecured medium-term notes issued				$ 250		$ 350		$ 350
Notional amount of interest rate swap	550	250				150		150	250
Interest rate on fixed-rate debt			6.00%		3.15%		3.50%
Face amount of unsecured medium-term notes hedged			250		150		150
Aggregate notional value of outstanding foreign currency forward contract	$ 270.4
Ineffectiveness related to foreign currency forward contract	0