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Employee Retirement Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Retirement Benefits [Abstract]      
Plan expenses $ 23.4 $ 18.8 $ 17.9
Projected benefit obligation 39.5 36.3  
Amount of net liability recognized 1.4 5.1  
Fair value of the plan assets 38.0 33.2  
Funded status of plans 1.5 3.1  
Net expense recognized $ 6.6 $ 0.2 $ 1.5