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Identifiable Intangible Assets Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Amortization $ 22.8 $ 22.1 $ 21.2
Software and Software Development Costs [Member]      
Finite-Lived Intangible Asset, Useful Life 6 years    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2 years 9 months 18 days    
Amortization $ 2.9 2.4 1.9
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3.2    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 2.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 2.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 1.5    
Business Combination-Related Identifiable Intangible [Member]      
Finite-Lived Intangible Asset, Useful Life 6 years 9 months 18 days    
Amortization $ 19.9 $ 19.7 $ 19.3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 20.7    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 20.7    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 20.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 20.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 20.5