Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended
	Nov. 16, 2012	Jan. 27, 2012	Oct. 31, 2012	Oct. 31, 2011
Shareholders' Equity [Abstract]
Tax expense relating to pension and postretirement liabilities			$ 4.3	$ 15.3
Stock repurchased during the period, shares			1,500,000
Stock repurchases during the period, value			$ 50.7
Average price per share			$ 33.82
Common stock authorized for repurchase			16,000,000
Shares with remaining authorization for repurchase under stock repurchase plan			4,100,000
Cash dividend declared per common share	$ 0.09
Percentage of stock dividend effected due to stock split		100.00%
Stock split ratio		2