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Intangible Assets - Remaining Amortization Expenses for Intangible Assets with Definite Lives (Details) - USD ($)
$ in Millions
Jul. 31, 2019
Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 35.1  
2020 135.6  
2021 134.3  
2022 132.4  
2023 130.2  
Thereafter 862.1  
Intangible assets with definite lives, net $ 1,429.7 $ 1,512.4