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Commitments and Contingencies (Details)
$ in Millions
8 Months Ended 12 Months Ended
Oct. 31, 2015
complaint
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Jul. 31, 2017
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]          
2018   $ 33.4      
2019   30.0      
2020   25.8      
2021   21.7      
2022   18.8      
2023 and thereafter   145.8      
Total   275.5      
Rent expense   32.2 $ 29.9 $ 27.5  
Payments for Legal Settlements   17.0      
Loss Contingency, New Claims Filed, Number | complaint 50        
Settlement accrual         $ 3.0
DPT Prelim Notice of Assessment   $ 31.0