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Investments (Narrative) (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
fund
Mar. 31, 2015
USD ($)
Apr. 05, 2016
Dec. 31, 2015
fund
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments $ 300,000 $ 700,000    
Number of affiliated funds holding seed money | fund 215     192
Gains and losses on trading securities $ (1,700,000) 200,000    
Seed Money [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Other-than-temporary impairment charges on seed money investments $ 0 $ 0    
Religare Invesco Asset Management Company [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Equity Method Investment, Ownership Percentage 49.00%      
Equity Method Investment, Other than Temporary Impairment $ 17,800,000      
Subsequent Event [Member] | Religare Invesco Asset Management Company [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Equity Method Investment, Ownership Percentage change     51.00%  
Equity Method Investment, Ownership Percentage     100.00%