Repurchases of Outstanding Securities (Details) (USD $) In Millions, except Share data	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Repurchases of Outstanding Securities (Details) [Abstract]
Authorized aggregate amount		$ 800.0
Total number of shares repurchased since inception of our stock repurchase program (shares)		29,322,753	23,470,345
Aggregate purchase price of shares repurchased since inception of our stock repurchase program		715.5	551.2
Number of shares repurchased (shares)	2,913,706	5,852,408
Purchase price of shares repurchased	$ 71.5	$ 164.3

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Stock repurchased and retired since inception of program (shares).

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Stock repurchased and retired since inception of program (value).

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Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: 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 2: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 4: 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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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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- Definition

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

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