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Identifiable Intangible Assets Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Amortization $ 28.5 $ 28.2 $ 28.2
Goodwill $ 98.6 115.1 99.8
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 7 months 6 days    
Amortization $ 2.9    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 3.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 2.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 0.9    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 0.5    
Customer Relationships [Member]      
Finite-Lived Intangible Asset, Useful Life 3 years 3 months 18 days    
Technology-Based Intangible Assets [Member]      
Finite-Lived Intangible Asset, Useful Life 8 years 6 months    
Business Combination-Related Identifiable Intangible [Member]      
Amortization $ 25.5 $ 25.2 $ 24.9
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 25.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 24.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 5.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4.9    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 4.7