Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details 4)

v2.3.0.15
Summary of Significant Accounting Policies (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2010
Auction Rate Securities.
Sep. 30, 2011
Auction Rate Securities.
Sep. 30, 2010
Auction Rate Securities.
Sep. 30, 2009
Auction Rate Securities.
Sep. 30, 2010
Put right
Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss)
Sep. 30, 2010
Accumulated Other Comprehensive Income (Loss)
Sep. 30, 2011
Investment Income
Sep. 30, 2010
Investment Income
Jun. 30, 2011
Forethought Note
Jun. 30, 2009
Forethought Note
Sep. 30, 2011
Forethought Note
Year
Sep. 30, 2010
Forethought Note
Apr. 20, 2011
Forethought Note
Auction Rate Securities                                
Percentage of historical cost of auction rate securities recovered (as a percent)       95.50%                        
Auction rate securities, fair value           $ 28.4                    
Auction rate securities, par value           30.1                    
Impairment charge recorded based on the estimated fair value of portfolio     2.9                          
Rollforward of auction rate securities classified as available-for-sale                                
Balance at the beginning of the period       11.9 18.8                      
Change in fair value       0.5 (1.6)                      
Sales or redemptions       12.4 (5.3)                      
Balance at the end of the period     11.9   11.9                      
Rollforward of auction rate securities classified as trading securities                                
Balance at the beginning of the period         28.4                      
Change in fair value         1.7                      
Sales or redemptions         30.1                      
Rollforward of Put Right related to auction rate securities                                
Balance at the beginning of the period             1.7                  
Change in fair value             (1.7)                  
Rollforward of amount included in accumulated other comprehensive loss, pre-tax (AOCL)                                
Balance at the beginning of the period                 1.5              
Change in fair value               (0.5) (1.5)              
Sales or redemptions               0.5                
Rollforward of (Gain) Loss included within Investment income (loss) and other, pre-tax                                
Balance at the beginning of the period                   (0.5)            
Change in fair value                     3.0          
Sales or redemptions                   (0.5)            
Balance at the end of the period                   (0.5)            
Note Receivable                                
Original term of Forethought Note (in years)                           10    
Interest rate on the Forethought Note for the first five years (as a percent)                           6.00%    
Term of initial interest rate (in years)                           5    
Increased interest rate on the Forethought Note (as a percent)                       10.00% 8.00%      
Effective interest rate over the life of the Forethought Note (as a percent)                           9.50%    
Forethought Note annual interest payments                             10.0  
Forethought Note interest payment 59.7 10.0                       59.7 10.0  
Forethought note principal and interest repayment                               $ 151.2