Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2014		Aug. 31, 2013		Aug. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 668.7	$ 603.9	$ 546.2	$ 574.7	$ 579.8	$ 541.5	$ 486.7	$ 481.1	$ 2,393.5	[1]	$ 2,089.1	[1]	$ 1,933.7	[1]
Gross Profit	283.5	243.4	215.2	237.1	237.3	221.1	189.7	189.5	979.2		837.6		788.0
Net Income	$ 54.8	$ 43.8	$ 32.7	$ 44.5	$ 44.9	$ 31.7	$ 24.7	$ 26.1	$ 175.8		$ 127.4		$ 116.3
Basic Earnings per Share (in dollars per share)	$ 1.27	$ 1.01	$ 0.76	$ 1.03	$ 1.04	$ 0.74	$ 0.58	$ 0.61	$ 4.07		$ 2.97		$ 2.75
Diluted Earnings per Share (in dollars per share)	$ 1.26	$ 1.01	$ 0.75	$ 1.03	$ 1.03	$ 0.73	$ 0.57	$ 0.61	$ 4.05		$ 2.95		$ 2.72

[1] Net sales are attributed to each country based on the selling location.