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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period $ 73.9 $ 137.8 $ 101.3 $ 117.2
Total Gains (Losses) Included in Earnings (0.3) 2.3 0.2 7.9
Total Gains (Losses) Included in AOCI       (0.5)
Purchases 4.4 1.9 12.5 23.9
Sales (2.8) (6.2) (32.8) (12.7)
Settlements (0.5) (50.0) (6.5) (50.0)
Balance at End of Period 74.7 85.8 74.7 85.8
Front Street Future Policyholder Benefits Reserve [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 654.0 584.5 629.2 151.3
Total Gains (Losses) Included in Earnings 14.1 (23.4) 34.3 (0.8)
Purchases   47.7   468.2
Settlements 59.2 (14.2) 54.6 (24.1)
Balance at End of Period 608.9 594.6 608.9 594.6
Fixed Index Annuity [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 136.5 155.9 142.3 150.8
Total Gains (Losses) Included in Earnings (3.0) (6.9) (8.8) (1.8)
Balance at End of Period 133.5 149.0 133.5 149.0
Equity conversion feature of preferred stock [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 790.5 740.4 771.5 302.1
Total Gains (Losses) Included in Earnings 11.1 (30.3) 25.5 (2.6)
Total Gains (Losses) Included in AOCI 0.0 0.0 0.0 0.0
Purchases 0.0 47.7 0.0 468.2
Sales 0.0 0.0 0.0 0.0
Settlements 59.2 (14.2) 54.6 (24.1)
Net transfer In (Out) of Level 3 0.0 0.0 0.0 0.0
Balance at End of Period 742.4 743.6 742.4 743.6
Corporate Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period   15.8 14.1 16.3
Total Gains (Losses) Included in Earnings     (0.5)  
Total Gains (Losses) Included in AOCI       (0.5)
Purchases     0.0  
Sales     (13.6)  
Settlements     0.0  
Balance at End of Period   15.8   15.8
Funds Withheld Receivables [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period   75.0   59.4
Total Gains (Losses) Included in Earnings   (0.7)   (0.6)
Purchases   1.9   23.9
Sales   (6.2)   (12.7)
Balance at End of Period   70.0   70.0
Other Invested Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period     2.8  
Total Gains (Losses) Included in Earnings     2.7  
Total Gains (Losses) Included in AOCI     0.0  
Purchases     0.0  
Sales     0.0  
Settlements     (5.5)  
Net transfer In (Out) of Level 3 (a)     0.0  
Balance at End of Period 0.0   0.0  
Funds withheld for reinsurance liability [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 73.9   84.4  
Total Gains (Losses) Included in Earnings (0.3)   (2.0)  
Total Gains (Losses) Included in AOCI 0.0   0.0  
Purchases 4.4   12.5  
Sales (2.8)   (19.2)  
Settlements (0.5)   (1.0)  
Net transfer In (Out) of Level 3 (a) 0.0   0.0  
Balance at End of Period $ 74.7   $ 74.7  
Contingent Purchase Price Reduction Receivable [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period   47.0   41.5
Total Gains (Losses) Included in Earnings   3.0   8.5
Settlements   $ (50.0)   $ (50.0)