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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Cost $ 1,383.8 $ 1,389.2
Accumulated Amortization (421.3) (399.2)
Net 962.5 990.0
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 979.9 985.2
Accumulated Amortization (259.8) (247.4)
Net $ 720.1 737.8
Customer Relationships [Member] | Weighted Average [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 18 years 6 months  
Customer Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 2 years  
Customer Relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 20 years  
Technology Assets [Member] | Weighted Average [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 11 years 1 month 6 days  
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 18 years  
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 165.4 165.4
Accumulated Amortization (77.5) (73.7)
Net $ 87.9 91.7
Trade Names [Member] | Weighted Average [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 16 years 2 months 12 days  
Trade Names [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 8 years  
Trade Names [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 17 years  
Technology-Based Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 238.5 238.6
Accumulated Amortization (84.0) (78.1)
Net $ 154.5 $ 160.5