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Consolidated Sponsored Investment Products - Schedule of Contractual Maturities for Debt of CSIPs (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Schedule Of Consolidated Sponsored Investment Products [Line Items]    
Total $ 1,044.2 $ 1,401.2
Consolidated SIPs [Member]    
Schedule Of Consolidated Sponsored Investment Products [Line Items]    
2018 5.8  
2019 47.6  
Total $ 53.4 $ 682.2