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Goodwill and Intangibles, including DAC and VOBA, net - Summary of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]    
Cost $ 1,389.2 $ 1,240.4
Accumulated Amortization (399.2) (323.2)
Net 990.0 917.2
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 985.2 877.1
Accumulated Amortization (247.4) (204.6)
Net $ 737.8 672.5
Customer Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 2 years  
Customer Relationships [Member] | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 20 years  
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 238.6 171.1
Accumulated Amortization (78.1) (61.0)
Net $ 160.5 110.1
Technology Assets [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 4 years  
Technology Assets [Member] | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 18 years  
Technology-Based Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 165.4 192.2
Accumulated Amortization (73.7) (57.6)
Net $ 91.7 $ 134.6