Amount available to increase commitment under credit facility.

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- Definition

Long term debt.

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- Definition

Notes redemption price.

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- Definition

Original discount rate on notes issued.

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- Definition

Unsecured revolving facility loans aggregate available amount to be drawn.

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- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ 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 Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

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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

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- Definition

Estimated fair value of the debt instrument at the balance-sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10

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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

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- 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.

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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Long-Term Debt (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Nov. 30, 2010
Long Term Debt (Textuals) [Abstract]
Fair value of 2013 and 2015 Notes based on estimated market prices	$ 699.0	$ 687.0
Notes redemption price	101% of the aggregate principal amount of such Notes plus accrued and unpaid interest
Unsecured revolving facility loans aggregate available amount to be drawn	500
Credit Facility, interest rate description	Eurodollar Rate Committed Loan will accrue interest at the British Bankers Association LIBOR, or BBA LIBOR, plus the Applicable Rate. US Dollar Rate Committed Loan will accrue interest at rates that are equal to the higher of (a) the Federal Funds Rate plus 0.5% (b) Bank of America’s “prime rate” as announced from time to time, or (c) BBA LIBOR plus the Applicable Rate.
Amount available to increase commitment under credit facility	100
Credit Facility financial covenants that require us to maintain certain financial ratios	Financial covenants require us to maintain a consolidated leverage ratio of no more than 3.25 to 1.00 and a consolidated interest coverage ratio of no less than 3.00 to 1.00
Debt Instrument [Line Items]
Unsecured senior notes issued			700
1.500% Fixed Rate Notes Due 2013 [Member]
Debt Instrument [Line Items]
Unsecured senior notes issued			300
Fixed interest rate on senior note			1.50%
Original discount rate on notes issued			99.694%
2.375% Fixed Rate Notes Due 2015 [Member]
Debt Instrument [Line Items]
Unsecured senior notes issued			$ 400
Fixed interest rate on senior note			2.375%
Original discount rate on notes issued			99.444%