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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount [1] $ 619.2 $ 260.9
Accumulated Amortization [1] (189.1) (157.0)
Total [1] $ 430.1 103.8
Intangible assets weighted average life 13 years  
Customer contracts and relationships    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 607.9 258.6
Accumulated Amortization (186.3) (155.1)
Total 421.6 103.5
Trademarks and trade names    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 10.8 1.8
Accumulated Amortization (2.4) (1.5)
Total 8.4 0.2
Contract rights and other    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 0.5 0.5
Accumulated Amortization (0.4) (0.4)
Total $ 0.1 $ 0.1
[1] These intangible assets are being amortized over the expected period of benefit, with a weighted average life of approximately 13 years.