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Goodwill (Schedule of Goodwill) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Abstract]      
Goodwill, Impairment Loss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss  
Goodwill [Roll Forward]      
Gross Book Value, Beginning Balance 6,867.3us-gaap_GoodwillGross 7,064.8us-gaap_GoodwillGross  
Net Book Value, Beginning Balance 6,867.3us-gaap_Goodwill 7,048.2us-gaap_Goodwill  
Dispositions, Gross Book Value   (91.1)ivz_GoodwillWrittenOffRelatedToSaleOfBusinessUnitGross  
Dispositions, Accumulated Impairment   16.6ivz_GoodwillWrittenOffRelatedToSaleOfBusinessUnitAccumulatedImpairmentLoss  
Dispositions, Net Book Value   (74.5)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit  
Foreign exchange and other (287.9)ivz_GoodwillTranslationAndOtherAdjustments (106.4)ivz_GoodwillTranslationAndOtherAdjustments  
Gross Book Value, Ending Balance 6,579.4us-gaap_GoodwillGross 6,867.3us-gaap_GoodwillGross  
Accumulated Impairment, Ending Balance   0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss (16.6)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Net Book Value, Ending Balance $ 6,579.4us-gaap_Goodwill $ 6,867.3us-gaap_Goodwill