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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Document Period End Date Jun. 30, 2016  
Cost $ 1,385.7 $ 1,389.2
Accumulated Amortization (465.0) (399.2)
Net 920.7 990.0
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 984.0 985.2
Accumulated Amortization (288.7) (247.4)
Net $ 695.3 737.8
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 (85.3) (73.7)
Net $ 80.1 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 $ 236.3 238.6
Accumulated Amortization (91.0) (78.1)
Net $ 145.3 $ 160.5