Stockholders' Deficit - Rollforward of Common Stock (Details) - shares shares in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	81.6	81.5	81.4
Shares issued (in shares)	17.0	0.1	0.1
Shares acquired (in shares)	(0.1)	0.0	0.0
Ending balance (in shares)	98.5	81.6	81.5
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	86.8	86.8	86.8
Shares issued (in shares)	16.3	0.0	0.0
Shares acquired (in shares)	0.0	0.0	0.0
Ending balance (in shares)	103.1	86.8	86.8
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	5.2	5.3	5.4
Shares issued (in shares)	(0.7)	(0.1)	(0.1)
Shares acquired (in shares)	0.1	0.0	0.0
Ending balance (in shares)	4.6	5.2	5.3