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Investments - Cash Flows from Consolidated Investing Activities by Security (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid $ 5,453.7 $ 5,609.2 $ 9,432.2
Cost of investments acquired (6,398.3) (7,221.4) (8,940.8)
Available-for-sale Securities [Member]      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid   5,084.1 8,986.9
Cost of investments acquired (5,685.2) (6,741.2) (8,757.5)
Trading Securities [Member]      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid 70.8 54.9 92.9
Cost of investments acquired   (99.7) (20.8)
Derivative [Member]      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid 443.6 470.2 352.4
Cost of investments acquired (713.1) (380.5) (162.5)
Net Investment Income      
Gain (Loss) on Investments [Line Items]      
Available For Sale Securities On Fixed Maturity Under Commitment Agreement 4,776.6 $ 5,033.4 $ 8,986.9
Net Investment Income | Available-for-sale Securities [Member]      
Gain (Loss) on Investments [Line Items]      
Proceeds from investments sold, matured or repaid $ 4,939.3