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Identifiable Intangible Assets Narrative - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Amortization $ 22.1 $ 21.2 $ 25.9
Software and Software Development Costs [Member]      
Finite-Lived Intangible Asset, Useful Life 6 years    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 8 months    
Amortization $ 2.4 1.9 1.6
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3.9    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3.3    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 2.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 2.1    
Business Combination-Related Identifiable Intangible [Member]      
Finite-Lived Intangible Asset, Useful Life 6 years 9 months    
Amortization $ 19.7 $ 19.3 $ 24.3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 20.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 19.8    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 19.8    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 19.8    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 19.7