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Investments (Details Of Company Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Investment Holdings [Line Items]    
Available for sale investments   $ 85.2
Equity investments $ 309.2 346.6
Equity Method Investments 308.7 277.3
Foreign time deposits   28.6
Cost Method Investments 5.8 6.2
Investments 643.8 674.6
Seed Money [Member]    
Investment Holdings [Line Items]    
Equity Investments 202.3 243.0
Deferred Compensation Arrangements [Member]    
Investment Holdings [Line Items]    
Equity Investments 90.4 92.3
Common Shares    
Investment Holdings [Line Items]    
Equity Investments   11.3
CLOs    
Investment Holdings [Line Items]    
Available for sale investments 0.0 6.0
Other debt securities    
Investment Holdings [Line Items]    
Available for sale investments $ 0.0 $ 9.9