Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details 2)

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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2011
Sep. 30, 2012
Forethought Note
   
Reconciliation of changes in Level 3 financial assets    
Balance at the beginning of the period $ 127.0  
Total gains (losses):    
Change in fair value, disclosure only 24.2  
Purchases, issuances and settlements (151.2)  
Equity Investments
   
Reconciliation of changes in Level 3 financial assets    
Balance at the beginning of the period 3.0 1.0
Total gains (losses):    
Transfers in and/or (out) of Level 3 (2.0)  
Balance at the end of the period $ 1.0 $ 1.0