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Investments (Details Of Company Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Investment Holdings [Line Items]    
Available for sale investments $ 233.9 $ 255.9
Equity method investments 323.2 332.1
Foreign time deposits 27.7 29.6
Cost Method Investments 6.6 4.6
Investments 938.9 885.4
Seed Money [Member]    
Investment Holdings [Line Items]    
Available for sale investments 226.9 246.2
Trading investments 127.7 68.2
Collateralized Loan Obligations [Member]    
Investment Holdings [Line Items]    
Available for sale investments 1.1 3.4
Other Debt Obligations [Member]    
Investment Holdings [Line Items]    
Available for sale investments 5.9 6.3
Deferred Compensation Arrangements [Member]    
Investment Holdings [Line Items]    
Trading investments 159.6 162.6
Common Stock [Member]    
Investment Holdings [Line Items]    
Trading investments 48.9 29.0
UIT-Related Equity And Debt Securities [Member]    
Investment Holdings [Line Items]    
Trading investments $ 11.3 $ 3.4