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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid $ 9,432.2 $ 6,206.7 $ 1,699.9
Cost of investments acquired (8,940.8) (5,972.7) (1,809.0)
Available-for-sale Securities
      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid   5,833.4 1,482.2
Cost of investments acquired (8,757.5) (5,640.1) (1,286.0)
Held-to-maturity Securities
      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid    109.6 101.8
Cost of investments acquired    (68.7) (123.4)
Trading (acquired for holding)
      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid 92.9 106.1 29.5
Cost of investments acquired (20.8) (122.3) (332.7)
Derivative and other
      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid 352.4 157.6 86.4
Cost of investments acquired (162.5) (141.6) (66.9)
Net Investment Income
      
Gain (Loss) on Investments [Line Items]      
Available For Sale Securities On Fixed Maturity Under Commitment Agreement $ 8,986.9 $ 4,603.0 $ 1,804.0