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Goodwill and Intangible Assets - Summary of Estimated Future Amortization (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]      
2021 (Apr - Sept) $ 50.2    
2022 82.1    
2023 66.2    
2024 53.1    
2025 42.8    
Thereafter 160.8    
Total amortizable intangible assets, net $ 455.2 $ 508.2 $ 569.3