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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Expected aggregate amortization expense of intangible assets for the next five fiscal years:          
Amortization expense of intangible assets     $ 59.6 $ 58.6 $ 50.8
Fiscal 2020     64.6    
Fiscal 2021     61.4    
Fiscal 2022     58.3    
Fiscal 2023     56.8    
Fiscal 2024     55.6    
Useful life       3 years  
Trademarks and tradenames $ 7.9   $ 16.2 $ 7.9  
Trademarks and tradenames          
Expected aggregate amortization expense of intangible assets for the next five fiscal years:          
Useful life 3 years        
Impairment charge   $ 75.0