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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expense of intangible assets $ 16.8 $ 14.6
Remainder of Fiscal 2020 48.7  
Fiscal 2021 61.8  
Fiscal 2022 58.8  
Fiscal 2023 57.3  
Fiscal 2024 $ 56.1