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Goodwill and Intangibles, including DAC and VOBA - Summary of Definite Lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jun. 30, 2014
Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]    
Document Period End Date Jun. 30, 2014  
Cost $ 1,253.2 $ 1,229.6
Accumulated Amortization (306.2) (244.5)
Net 947.0 985.1
Minimum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 1 year  
Maximum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 20 years  
Customer relationships [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Cost 889.6 885.9
Accumulated Amortization (196.3) (160.8)
Net 693.3 725.1
Customer relationships [Member] | Minimum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 15 years  
Customer relationships [Member] | Maximum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 20 years  
Trade names [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Cost 171.4 171.6
Accumulated Amortization (57.0) (44.7)
Net 114.4 126.9
Trade names [Member] | Minimum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 1 year  
Trade names [Member] | Maximum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 12 years  
Technology assets [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Cost 192.2 172.1
Accumulated Amortization (52.9) (39.0)
Net $ 139.3 $ 133.1
Technology assets [Member] | Minimum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 4 years  
Technology assets [Member] | Maximum [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 17 years