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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]    
Document Period End Date Dec. 31, 2016  
Cost $ 1,376.8 $ 1,387.7
Accumulated Amortization (508.5) (488.7)
Net 868.3 899.0
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 973.3 984.8
Accumulated Amortization (313.2) (302.9)
Net $ 660.1 681.9
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 2 months 6 days  
Technology Assets [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 5 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 $ 165.7 165.7
Accumulated Amortization (93.0) (89.1)
Net $ 72.7 76.6
Trade Names [Member] | Weighted Average [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 11 years 4 months 12 days  
Trade Names [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 5 years  
Trade Names [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortizable Life 13 years  
Technology-Based Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 237.8 237.2
Accumulated Amortization (102.3) (96.7)
Net $ 135.5 $ 140.5