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Investments (Details Of Company Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Investment Holdings [Line Items]    
Available for sale investments $ 90.9 $ 154.0
Equity method investments 296.5 279.0
Foreign time deposits 27.5 26.9
Cost Method Investments 6.1 5.8
Investments 690.9 795.3
Seed Money [Member]    
Investment Holdings [Line Items]    
Available for sale investments 74.5 127.9
Trading investments 160.7 121.9
Collateralized Loan Obligations [Member]    
Investment Holdings [Line Items]    
Available for sale investments 6.7 12.9
Other Debt Obligations [Member]    
Investment Holdings [Line Items]    
Available for sale investments 9.7 13.2
Deferred Compensation Arrangements [Member]    
Investment Holdings [Line Items]    
Trading investments 89.6 170.5
Common Stock [Member]    
Investment Holdings [Line Items]    
Trading investments 17.9 30.4
UIT-Related Equity And Debt Securities [Member]    
Investment Holdings [Line Items]    
Trading investments $ 1.7 $ 6.8