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Fair Value of Financial Instruments - Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Asset-backed securities [Member]
Broker Quoted [Member]
Sep. 30, 2013
Asset-backed securities [Member]
Broker Quoted [Member]
Jun. 30, 2014
Commercial mortgage-backed securities [Member]
Broker Quoted [Member]
Sep. 30, 2013
Commercial mortgage-backed securities [Member]
Broker Quoted [Member]
Jun. 30, 2014
Corporates [Member]
Broker Quoted [Member]
Sep. 30, 2013
Corporates [Member]
Broker Quoted [Member]
Jun. 30, 2014
Corporates [Member]
Matrix Pricing [Member]
Sep. 30, 2013
Corporates [Member]
Matrix Pricing [Member]
Jun. 30, 2014
Municipal Bonds [Member]
Market pricing [Member]
Jun. 30, 2014
Municipal Bonds [Member]
Broker Quoted [Member]
Jun. 30, 2014
Equity Securities [Member]
Sep. 30, 2013
Equity Securities [Member]
Jun. 30, 2014
Equity Securities [Member]
Market pricing [Member]
Sep. 30, 2013
Equity Securities [Member]
Option Pricing [Member]
Jun. 30, 2014
Equity Securities [Member]
Broker Quoted [Member]
Jun. 30, 2014
Nomura Fund Linked Note [Member]
Option Pricing [Member]
Jun. 30, 2014
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Contingent purchase price reduction receivable [Member]
Sep. 30, 2013
Contingent purchase price reduction receivable [Member]
Jun. 30, 2014
Contingent purchase price reduction receivable [Member]
Discounted cash flow [Member]
Jun. 30, 2014
Nomura Fund Linked Note [Member]
Jun. 16, 2014
Nomura Fund Linked Note [Member]
Jun. 30, 2014
Fixed Index Annuity [Member]
Sep. 30, 2013
Fixed Index Annuity [Member]
Jun. 30, 2014
Fixed Index Annuity [Member]
Discounted cash flow [Member]
Jun. 30, 2014
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Front Street Future Policyholder Benefits Reserve [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Equity conversion feature of preferred stock [Member]
Sep. 30, 2013
Equity conversion feature of preferred stock [Member]
Jun. 30, 2014
Equity conversion feature of preferred stock [Member]
Monte Carlo simulation / Option model [Member]
Jun. 30, 2014
Minimum [Member]
Asset-backed securities [Member]
Jun. 30, 2014
Minimum [Member]
Commercial mortgage-backed securities [Member]
Jun. 30, 2014
Minimum [Member]
Corporates [Member]
Jun. 30, 2013
Minimum [Member]
Corporates [Member]
Jun. 30, 2013
Minimum [Member]
Hybrids [Member]
Jun. 30, 2014
Minimum [Member]
Contingent purchase price reduction receivable [Member]
Jun. 30, 2013
Minimum [Member]
Contingent purchase price reduction receivable [Member]
Jun. 30, 2014
Minimum [Member]
Fixed Index Annuity [Member]
Jun. 30, 2013
Minimum [Member]
Fixed Index Annuity [Member]
Jun. 30, 2013
Minimum [Member]
Equity conversion feature of preferred stock [Member]
Jun. 30, 2014
Maximum [Member]
Asset-backed securities [Member]
Jun. 30, 2014
Maximum [Member]
Commercial mortgage-backed securities [Member]
Jun. 30, 2013
Maximum [Member]
Commercial mortgage-backed securities [Member]
Jun. 30, 2014
Maximum [Member]
Corporates [Member]
Jun. 30, 2013
Maximum [Member]
Corporates [Member]
Jun. 30, 2013
Maximum [Member]
Hybrids [Member]
Jun. 30, 2014
Maximum [Member]
Contingent purchase price reduction receivable [Member]
Jun. 30, 2013
Maximum [Member]
Contingent purchase price reduction receivable [Member]
Jun. 30, 2014
Maximum [Member]
Fixed Index Annuity [Member]
Jun. 30, 2013
Maximum [Member]
Fixed Index Annuity [Member]
Jun. 30, 2013
Maximum [Member]
Equity conversion feature of preferred stock [Member]
Jun. 30, 2014
Weighted Average [Member]
Jun. 30, 2014
Weighted Average [Member]
Asset-backed securities [Member]
Jun. 30, 2013
Weighted Average [Member]
Asset-backed securities [Member]
Jun. 30, 2014
Weighted Average [Member]
Commercial mortgage-backed securities [Member]
Jun. 30, 2014
Weighted Average [Member]
Corporates [Member]
Jun. 30, 2013
Weighted Average [Member]
Corporates [Member]
Jun. 30, 2014
Weighted Average [Member]
Municipal Debt Securities [Member]
Jun. 30, 2014
Weighted Average [Member]
Hybrids [Member]
Jun. 30, 2013
Weighted Average [Member]
Hybrids [Member]
Jun. 30, 2014
Weighted Average [Member]
Equities [Member]
Jun. 30, 2014
Weighted Average [Member]
Nomura Fund Linked Note [Member]
Jun. 30, 2014
Weighted Average [Member]
Contingent purchase price reduction receivable [Member]
Jun. 30, 2013
Weighted Average [Member]
Contingent purchase price reduction receivable [Member]
Jun. 30, 2014
Weighted Average [Member]
Fixed Index Annuity [Member]
Jun. 30, 2013
Weighted Average [Member]
Fixed Index Annuity [Member]
Jun. 30, 2013
Weighted Average [Member]
Equity conversion feature of preferred stock [Member]
Jun. 30, 2014
Front Street Future Policyholder Benefits Reserve [Member]
Minimum [Member]
Jun. 30, 2014
Front Street Future Policyholder Benefits Reserve [Member]
Maximum [Member]
Jun. 30, 2014
Front Street Future Policyholder Benefits Reserve [Member]
Weighted Average [Member]
Jun. 30, 2014
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 1 [Member]
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Level 1 [Member]
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 2 [Member]
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Level 2 [Member]
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 2 [Member]
Front Street Future Policyholder Benefits Reserve [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 3 [Member]
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Level 3 [Member]
Fixed Index Annuity [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2014
Level 3 [Member]
Front Street Future Policyholder Benefits Reserve [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                                                                                                                                                                                
Assets, Fair Value Disclosure, Recurring                                     $ 19,524.4 [1] $ 17,820.9                                                                                                             $ 1,812.6 [1] $ 2,761.4     $ 16,781.2 [1] $ 14,536.0       $ 930.6 [1] $ 523.5      
Document Period End Date Jun. 30, 2014                                                                                                                                                                              
Valuation Technique     Broker-quoted           Matrix Pricing     Broker-quoted       Option Pricing Broker-quoted Black Scholes model         Discounted cash flow         Discounted cash flow           Monte Carlo simulation / Option model                                                                                                            
Derivative Liability                                                         1,864.5 [1] 1,544.4 [1] 154.9 [1]                                                                                              [1]    [1]        [1]    [1]    [1]     1,864.5 [1] 1,544.4 [1] 154.9 [1]
Assets, Fair Value Disclosure 930.6 523.5 5.9 5.0 83.9 5.7 653.5 404.5 91.7 56.6 36.5   0 10.7 6.0           41.5 41.0                                                                                                                                    
Embedded Derivative, Fair Value of Embedded Derivative Liability                                               11.6 11.3                                                                                                                              
Probability of collection                                                                               88.00% 88.00%                   96.00% 96.00%                             92.00% 92.00%                                        
Expected term                                                                                                     7 months 15 days 9 months                                                                        
Discount rate                                                                                                     1.00% 1.00%                                                                        
Credit insurance risk premium                                                                                                     12.00% 11.00%                                                                        
Quoted prices                                                                         62.00% 0.00%                    142.00% 113.00%                      100.00% 90.00%     0.00%                                                
Offered quotes                                                                        104.00% 96.00% 90.00%                121.00% 96.00% 121.00% 131.00%               102.00% 103.00% 119.00% 102.00% 97.00% 117.00% 25.00%   100.00% 100.00%                                            
Fair Value Inputs, Risk-free Discount Factor                                                                                                               0.999                                                                
Fair Value Inputs, Risk-adjusted Discount Factor                                                                                                               0.995                                                                
Fair Value Inputs, Upward Movement                                                                                                               1.1                                                                
Fair Value Inputs, Downward Movement                                                                                                               0.9                                                                
Fair Value Inputs, Probability of Upward Movement                                                                                                               48.60%                                                                
Fair Value Inputs, Probability of Downward Movement                                                                                                               51.40%                                                                
Liabilities                                                                                                                                                                                
Liabilities, Fair Value Disclosure $ 2,019.4 $ 1,875.2                                               $ 1,864.5 $ 1,544.4         $ 0 $ 330.8                                                                                                              
Market value of option                                                                                   0.00% 0.00%                   48.00% 38.00%                             4.00% 4.00%                                    
SWAP rates                                                                                   2.00% 2.00%                   3.00% 3.00%                             2.00% 2.00%                                    
Mortality multiplier                                                                                                                                          80.00% 80.00%                                    
Surrender rates                                                                                   0.50% 0.50%                   75.00% 75.00%                             7.00% 7.00%                                    
Non-performance spread                                                                                                                                         0.25% 0.25%   0.50% 1.50%                              
Risk margin for uncertainty                                                                                                                                                   0.50%                            
Annualized volatility of equity                                                                                                                                              42.00%                                  
Discount yield                                                                                                                                               11.00%                                  
Non-cash accretion rate                                                                                                             0.00%                                                                  
Calibration adjustment                                                                                       0.00%                     1.00%                               0.30%                                  
[1] The carrying amounts of trade receivables, accounts payable, accrued investment income and portions of other insurance liabilities approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.