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Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data	1 Months Ended			3 Months Ended		6 Months Ended
	Feb. 28, 2006	Oct. 31, 2005	Oct. 31, 2002	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Shareholders' Equity
Stock repurchase program, authorized amount	$ 200	$ 100	$ 100
Total stock repurchase authorization				400,000,000		400,000,000
Shares repurchased under authorized repurchase programs				9,688,900		9,688,900
Stock repurchases, shares				0	0	0	0
Value of shares repurchased under authorized repurchase programs				297.7		297.7
Remaining value of stock repurchase programs authorization						102.3
Value of shares repurchased from employees, separate from other authorizations						$ 2.0	$ 1.7

X

- Definition

Shares repurchased under authorized repurchase programs

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Balance Type:	na
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X

- Definition

Value of stock repurchased from employees

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- Definition

Total stock repurchase authorization

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- Definition

Value of shares repurchased under authorized repurchase programs

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 11A
-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.

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- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

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Balance Type:	credit
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- Definition

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

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Balance Type:	credit
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