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Investments (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
fund
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
fund
Jun. 30, 2015
USD ($)
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 $ 100,000 $ 500,000 $ 400,000 $ 1,200,000    
Number of affiliated funds holding seed money | fund 134   134     192
Gains and losses on trading securities $ 3,300,000 $ (2,100,000)        
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 change         51.00%  
Equity Method Investment, Ownership Percentage 49.00%   49.00%   100.00%  
Equity Method Investment, Other than Temporary Impairment $ 17,800,000