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Goodwill and Intangibles, including DAC and VOBA - Summary of Definite Lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2014
Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]    
Document Period End Date Mar. 31, 2014  
Cost $ 1,252.2 $ 1,229.6
Accumulated Amortization (285.5) (244.5)
Net 966.7 985.1
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 888.6 885.9
Accumulated Amortization (184.5) (160.8)
Net 704.1 725.1
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 (52.8) (44.7)
Net 118.6 126.9
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 (48.2) (39.0)
Net $ 144.0 $ 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