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Goodwill and Intangibles, net - Summary of Changes in Carrying Amounts of Goodwill and Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Goodwill And Intangible Assets [Line Items]      
Cost $ 909.7   $ 884.8
Intangible Assets, Including Goodwill [Roll Forward]      
Beginning Balance, Goodwill 2,277.1    
Beginning Balance, Indefinite Lived Intangible Assets 1,024.3    
Beginning Balance, Finite Lived Intangible Assets 587.7    
Beginning Balance, Intangible Assets, Excluding Goodwill 1,612.0    
Less: Components of amortization:      
Effect of translation, Goodwill (0.7)    
Effect of translation, Finite Lived intangible assets 1.6    
Ending Balance, Goodwill 2,276.4    
Ending Balance, Indefinite Lived Intangible Assets 1,025.3    
Ending Balance, Finite Lived Intangible Assets 573.3    
Ending Balance, Intangible Assets, Excluding Goodwill 1,598.6    
Finite-Lived Intangible Assets, Accumulated Amortization 336.4   297.1
Periodic amortization      
Less: Components of amortization:      
Amortization of Intangible Assets (15.0)    
Customer Relationships [Member]      
Goodwill And Intangible Assets [Line Items]      
Cost 672.6   671.7
Intangible Assets, Including Goodwill [Roll Forward]      
Beginning Balance, Finite Lived Intangible Assets 449.4    
Less: Components of amortization:      
Ending Balance, Finite Lived Intangible Assets 440.2    
Finite-Lived Intangible Assets, Accumulated Amortization 232.4   222.3
Definite Lived Intangible Assets      
Intangible Assets, Including Goodwill [Roll Forward]      
Beginning Balance, Finite Lived Intangible Assets 587.7    
Less: Components of amortization:      
Amortization of Intangible Assets (15.0) $ (15.4)  
Effect of translation, Finite Lived intangible assets 0.6    
Ending Balance, Finite Lived Intangible Assets 573.3    
Definite Lived Intangible Assets | Periodic amortization      
Less: Components of amortization:      
Amortization of Intangible Assets (15.0)    
Trade Names [Member]      
Goodwill And Intangible Assets [Line Items]      
Cost 5.5   18.5
Intangible Assets, Including Goodwill [Roll Forward]      
Beginning Balance, Finite Lived Intangible Assets 3.4    
Less: Components of amortization:      
Ending Balance, Finite Lived Intangible Assets 2.7    
Finite-Lived Intangible Assets, Accumulated Amortization 2.8   $ 15.1
Indefinite Lived Intangible Assets Excluding Goodwill [Member]      
Less: Components of amortization:      
Effect of translation, Indefinite Lived intangible assets $ 1.0