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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]            
Amortization expense of intangible assets   $ 14.6 $ 14.9 $ 43.7 $ 43.4  
Remainder of Fiscal 2019   14.9   14.9    
Fiscal 2020   58.1   58.1    
Fiscal 2021   54.9   54.9    
Fiscal 2022   51.8   51.8    
Fiscal 2023   50.3   50.3    
Trademarks and tradenames   $ 16.4 $ 7.9 $ 16.4 $ 7.9 $ 7.9
Trademarks and Trade Names            
Finite-Lived Intangible Assets [Line Items]            
Useful life 3 years          
Impairment of intangible assets $ 75.0