Common Stock (Tables)

6 Months Ended

Apr. 30, 2017

Equity [Abstract]

Schedule of Repurchase Activity

Repurchase Activity

	Six Months Ended April 30,
(in millions, except per share amounts)	2017		2016
Total number of shares purchased	0.2		0.7
Average price paid per share	$	40.07	$	29.82
Total cash paid for share repurchases	$	7.9	$	21.5