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Revenue - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Oct. 31, 2019
Revenue from Contract with Customer [Abstract]      
Revenue recognized that was previously deferred $ 49.0 $ 39.4  
Capitalized contract acquisition costs 13.1   $ 15.7
Amortization of capitalized contract acquisition costs 5.6 $ 4.1  
Remaining performance obligation $ 905.0