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Intangible Assets - Remaining Amortization Expenses for Intangible Assets with Definite Lives (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2020 $ 101.5  
2020 135.0  
2021 133.1  
2022 130.9  
2023 126.6  
Thereafter 738.4  
Intangible assets with definite lives, net $ 1,365.5 $ 1,396.4