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Earnings Per Share (Narrative) (Details)	12 Months Ended
Earnings Per Share (Narrative) (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount	0	0	0
Contingently issuable share excluded	300,000ivz_ContingentlyIssuableShareExcluded	300,000ivz_ContingentlyIssuableShareExcluded	200,000ivz_ContingentlyIssuableShareExcluded

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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