Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012 years	Jan. 31, 2011
Income Taxes [Abstract]
Effective tax rate	29.60%	34.40%	27.30%	30.20%
Charges related to reorganization of subsidiary holdings		$ 4.0
Tax audit settlements			4.3	2.7
Effective income tax rate without consideration of discrete items			30.30%	29.90%
Unrecognized tax benefits	17.3	0.9	17.3	0.9
Accrued interest and penalties	1.4		1.4
Statute of limitations period, average, years			5
Maximum reduction in amount of unrecognized tax benefits			3.4
Unrecognized tax benefits potential expiration date, months			12
Unrecognized tax benefits in dispute with various taxing authorities	$ 0.2		$ 0.2