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Investments (Details Of Company Investments) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Available for sale investments $ 261.0 $ 244.1
Equity method investments 315.8 308.2
Foreign time deposits 29.6 28.8
Cost Method Investments 5.6 5.6
Investments 886.5 839.7
Seed Money [Member]
   
Investment Holdings [Line Items]    
Available for sale investments 250.6 233.8
Trading investments 10.1 0
Collateralized Loan Obligations [Member]
   
Investment Holdings [Line Items]    
Available for sale investments 4.1 4.0
Other Debt Obligations [Member]
   
Investment Holdings [Line Items]    
Available for sale investments 6.3 6.3
Deferred Compensation Arrangements [Member]
   
Investment Holdings [Line Items]    
Trading investments 234.1 249.7
Other equity investments [Member]
   
Investment Holdings [Line Items]    
Trading investments 26.8 0
UIT-Related Equity And Debt Securities [Member]
   
Investment Holdings [Line Items]    
Trading investments $ 3.5 $ 3.3