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Fair Value Measurements - Fair Value, by Balance Sheet Grouping (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Investment securities, trading $ 1,196.7 $ 1,130.6
Investment securities, available-for-sale 682.2 870.0
Life settlement contracts 13.8 12.1
Total Assets Measured at Fair Value 1,892.7 2,012.7
Contingent consideration liabilities 97.7  
Level 1 [Member]
   
Investment securities, trading 1,121.5 1,058.6
Life settlement contracts 0 0
Total Assets Measured at Fair Value 1,667.4 1,659.8
Contingent consideration liabilities 0  
Level 2 [Member]
   
Investment securities, trading 75.2 69.3
Life settlement contracts 0 0
Total Assets Measured at Fair Value 211.5 338.1
Contingent consideration liabilities 0  
Level 3 [Member]
   
Investment securities, trading 0 2.7
Life settlement contracts 13.8 12.1
Total Assets Measured at Fair Value 13.8 14.8
Contingent consideration liabilities 97.7  
Sponsored Investment Products [Member]
   
Investment securities, available-for-sale 534.6 587.2
Sponsored Investment Products [Member] | Level 1 [Member]
   
Investment securities, available-for-sale 534.6 587.2
Sponsored Investment Products [Member] | Level 2 [Member]
   
Investment securities, available-for-sale 0 0
Sponsored Investment Products [Member] | Level 3 [Member]
   
Investment securities, available-for-sale 0 0
Securities of U.S. states and political subdivisions [Member]
   
Investment securities, available-for-sale 23.1 26.8
Securities of U.S. states and political subdivisions [Member] | Level 1 [Member]
   
Investment securities, available-for-sale 0 0
Securities of U.S. states and political subdivisions [Member] | Level 2 [Member]
   
Investment securities, available-for-sale 23.1 26.8
Securities of U.S. states and political subdivisions [Member] | Level 3 [Member]
   
Investment securities, available-for-sale 0 0
Securities of the U.S. Treasury and federal agencies [Member]
   
Investment securities, available-for-sale 2.3 2.4
Securities of the U.S. Treasury and federal agencies [Member] | Level 1 [Member]
   
Investment securities, available-for-sale 0 0
Securities of the U.S. Treasury and federal agencies [Member] | Level 2 [Member]
   
Investment securities, available-for-sale 2.3 2.4
Securities of the U.S. Treasury and federal agencies [Member] | Level 3 [Member]
   
Investment securities, available-for-sale 0 0
Corporate debt securities [Member]
   
Investment securities, available-for-sale 0 70.3
Corporate debt securities [Member] | Level 1 [Member]
   
Investment securities, available-for-sale   0
Corporate debt securities [Member] | Level 2 [Member]
   
Investment securities, available-for-sale   70.3
Corporate debt securities [Member] | Level 3 [Member]
   
Investment securities, available-for-sale   0
Mortgage-backed securities - agency residential [Member]
   
Investment securities, available-for-sale 110.9 [1] 169.3 [1]
Mortgage-backed securities - agency residential [Member] | Level 1 [Member]
   
Investment securities, available-for-sale 0 0
Mortgage-backed securities - agency residential [Member] | Level 2 [Member]
   
Investment securities, available-for-sale 110.9 169.3
Mortgage-backed securities - agency residential [Member] | Level 3 [Member]
   
Investment securities, available-for-sale 0 0
Other equity securities [Member]
   
Investment securities, available-for-sale 11.3 14.0
Other equity securities [Member] | Level 1 [Member]
   
Investment securities, available-for-sale 11.3 14.0
Other equity securities [Member] | Level 2 [Member]
   
Investment securities, available-for-sale 0 0
Other equity securities [Member] | Level 3 [Member]
   
Investment securities, available-for-sale $ 0 $ 0
[1] Consist of U.S. government-sponsored enterprise obligations.