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Restructuring and Related Costs - Restructuring and Related Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Cumulative restructuring costs $ 62.5    
Restructuring Reserve [Roll Forward]      
Balance, beginning 8.0 $ 6.6 $ 0.0
Costs recognized 20.9 29.0 12.7
Payments (23.0) (25.2) (3.3)
Non-cash charges   (2.5) (2.8)
Non-cash charges 0.9    
Balance, ending 6.7 8.0 6.6
External Support Fees      
Restructuring Cost and Reserve [Line Items]      
Cumulative restructuring costs 28.0    
Restructuring Reserve [Roll Forward]      
Balance, beginning 1.2 2.1 0.0
Costs recognized 12.1 11.3 4.6
Payments (10.8) (12.2) (2.5)
Non-cash charges   0.0 0.0
Non-cash charges 0.0    
Balance, ending 2.5 1.2 2.1
Employee Severance      
Restructuring Cost and Reserve [Line Items]      
Cumulative restructuring costs 13.8    
Restructuring Reserve [Roll Forward]      
Balance, beginning 3.8 4.3 0.0
Costs recognized 0.5 8.6 4.7
Payments (3.3) (9.1) (0.4)
Non-cash charges   0.0 0.0
Non-cash charges 0.0    
Balance, ending 1.0 3.8 4.3
Other Project Fees      
Restructuring Cost and Reserve [Line Items]      
Cumulative restructuring costs 10.4    
Restructuring Reserve [Roll Forward]      
Balance, beginning 0.5 0.2 0.0
Costs recognized 5.7 3.9 0.8
Payments (5.8) (3.6) (0.4)
Non-cash charges   0.0 (0.2)
Non-cash charges 0.0    
Balance, ending 0.4 0.5 0.2
Lease Exit      
Restructuring Cost and Reserve [Line Items]      
Cumulative restructuring costs 5.7    
Restructuring Reserve [Roll Forward]      
Balance, beginning 2.5 0.0 0.0
Costs recognized 2.6 3.2 0.0
Payments (3.1) (0.3) 0.0
Non-cash charges   (0.4) 0.0
Non-cash charges 0.9    
Balance, ending 2.8 2.5 0.0
Asset Impairment      
Restructuring Cost and Reserve [Line Items]      
Cumulative restructuring costs 4.7    
Restructuring Reserve [Roll Forward]      
Balance, beginning 0.0 0.0 0.0
Costs recognized 0.0 2.1 2.6
Payments 0.0 0.0 0.0
Non-cash charges   (2.1) (2.6)
Non-cash charges 0.0    
Balance, ending $ 0.0 $ 0.0 $ 0.0