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Goodwill and Intangibles, including DAC and VOBA - Summary of Amortization Expense of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangibles $ 99.6 $ 40.7 $ 149.6 $ 121.5
Customer Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangibles 12.9 11.7 37.0 35.0
Trade Names [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangibles 4.1 4.1 12.3 12.3
Technology assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangibles 5.3 4.7 14.7 13.9
Definite Lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangibles $ 22.3 $ 20.5 $ 64.0 $ 61.2