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Goodwill and Intangible Assets - Summary of Estimated Future Amortization (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
2021 $ 147.9  
2022 120.4  
2023 97.3  
2024 78.7  
2025 63.6  
Thereafter 242.0  
Total amortizable intangible assets, net $ 749.9 $ 932.4