Dividend Per Common Share Maximum.

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- Definition

Dividend Per Common Share Minimum.

+ Details

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- Definition

Maximum value of shares authorized to be repurchased under share repurchase program.

+ Details

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- Definition

Number of shares repurchased to date.

+ Details

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- Definition

Shareholders' equity.

+ Details

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- Definition

Value Of Shares Repurchased To Date.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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- Definition

Cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7
-Subparagraph b

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Shareholders' Equity (Details) (USD $) In Millions, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Feb. 21, 2011	Feb. 22, 2010	Feb. 26, 2008
Shareholders' Equity (Textuals) [Abstract]
Dividends on Common Stock, minimum					$ 0.29	$ 0.27
Dividends on Common Stock, maximum					$ 0.32	$ 0.29
Repurchase of shares	100,000	112,500	212,500	225,000
Maximum value of shares authorized to be repurchased under share repurchase program							$ 300.0
Value of Shares repurchased	12.2	11.1	26.0	23.1
Number of shares repurchased to date	2,948,100		2,948,100
Shares repurchased to date, value	$ 278.0		$ 278.0