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Goodwill and Intangibles, including DAC and VOBA, net - Estimated Amortization Expense for VOBA and DAC in Future Fiscal Periods (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Schedule Of Amortization Expense And Weighted Average Lives Of Identified Intangible Assets [Line Items]      
Amortization of intangibles $ 129.6 $ 179.2 $ 260.1
Finite-Lived Intangible Assets, Amortization Expense, Year Two 93.9    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 93.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 86.2    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 85.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 84.9    
Finite-Lived Intangible Assets, Accumulated Amortization 399.2 323.2  
VOBA      
Schedule Of Amortization Expense And Weighted Average Lives Of Identified Intangible Assets [Line Items]      
Amortization of intangibles 21.8 55.8 137.0
Cumulative Adjustments For Net Unrealized Investment Gains (0.9) 164.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 40.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 35.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 28.4    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 23.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 18.5    
2019 and thereafter 83.2    
Finite-Lived Intangible Assets, Accumulated Amortization 348.1 326.3  
DAC      
Schedule Of Amortization Expense And Weighted Average Lives Of Identified Intangible Assets [Line Items]      
Amortization of intangibles 20.0 41.7 45.3
Cumulative Adjustments For Net Unrealized Investment Gains 0.9 $ (55.5)  
Deferred Sales Inducements Net Of Shadow Adjustments $ 59.2   $ 32.7