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Acquisitions - GCA Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 01, 2017
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Business Acquisition [Line Items]        
Goodwill   $ 1,864.2 $ 912.8 $ 867.5
Acquired Intangible Assets        
Amortization period for acquired intangible assets   13 years    
GCA Holding Corp.        
Business Acquisition [Line Items]        
Cash and cash equivalents $ 2.5      
Trade accounts receivable [1] 118.1      
Prepaid expenses and other current assets 10.3      
Property, plant and equipment 41.4      
Goodwill [2] 933.9      
Other assets 4.2      
Trade accounts payable (9.1)      
Insurance reserves (35.5)      
Income taxes payable (16.5)      
Accrued liabilities (36.5)      
Deferred income tax liability, net (92.6)      
Other liabilities (8.1)      
Net assets acquired 1,261.3      
Acquired Receivables        
Trade accounts receivable, gross 122.0      
Estimated uncollectible trade accounts receivable 3.9      
GCA Holding Corp. | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets [3] $ 340.0      
Acquired Intangible Assets        
Amortization period for acquired intangible assets 15 years      
GCA Holding Corp. | Trade names        
Business Acquisition [Line Items]        
Intangible assets [3] $ 9.0      
Acquired Intangible Assets        
Amortization period for acquired intangible assets 2 years      
[1] The gross amount of trade accounts receivable was $122.0 million, of which $3.9 million is expected to be uncollectible.
[2] Goodwill is largely attributable to value we expect to obtain from long-term business growth, the established workforce, and buyer-specific synergies. This goodwill is not deductible for income tax purposes.
[3] The amortization periods for the acquired intangible assets are 15 years for customer contracts and 2 years for trade names.