Share Capital (Narrative) (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Stockholders' Equity Attributable to Parent [Abstract]
Shares repurchased	6.4	13.4	6.4
Cost of repurchased shares		$ 333.0
Shares withheld to meet employees' tax withholding obligations	1.4	2.7	1.4
Carrying values of shares withheld		71.9	36.5
Share repurchase plan, authorized maximum		835.4
Treasury shares held, as unvested restricted stock awards	12.8	9.9	12.8
Common shares market price (per share)		$ 15.51
Treasury stock shares	41.2	49.3	41.2
Treasury shares market value		$ 764.6

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Common Shares Market Price Per Share

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Shares remaining under shares repurchase program authorized by Invesco Board of Directors.

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Shares withheld on vesting events during the period to meet employees' withholding tax obligations

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Unvested restricted stock awards (RSA) held as treasury shares for which dividend and voting rights apply. RSA is a share of stock granted to an employee for which sale is prohibited for a specified period of time or performance conditions are met.

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Treasury stock, value acquired, cost method, net of shares withheld for vesting events.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ 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

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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