Pension and Profit Sharing Plans - Net Periodic Pension Cost and Pension Plan Asset Allocation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Domestic Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 2.7	$ 3.1	$ 2.7
Interest cost	6.6	6.5	6.8
Expected return on plan assets	(6.5)	(5.9)	(5.9)
Amortization of prior service cost	0.1	0.1	0.1
Curtailment	0.1	0	0.2
Recognized actuarial loss	3.2	3.7	2.7
Net periodic pension cost	6.2	7.5	6.6
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.80%	5.00%
Rate of compensation increase	5.50%	5.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.00%	5.00%	6.00%
Expected return on plan assets	7.50%	7.80%	8.00%
Rate of compensation increase	5.50%	5.50%	5.50%
Reduction in net periodic pension cost per 100 basis point increase in benefig obligation discount rate	1.1
Additional net periodic pension cost per 100 basis point decrease in expected retun on plan assets rate	0.9
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, equity securities	55.00%
Targeted asset allocation, fixed income securities	40.00%
Targeted asset allocation, real estate funds	5.00%
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Equity securities	57.30%	57.70%
Fixed income securities	37.80%	37.30%
Real estate	4.90%	5.00%
Total	100.00%	100.00%
International Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0.1	0.1	0.1
Interest cost	1.9	1.8	1.7
Expected return on plan assets	(1.7)	(1.6)	(1.5)
Amortization of prior service cost	0	0	0
Curtailment	0	0	0.1
Recognized actuarial loss	0.9	1.1	0.8
Net periodic pension cost	1.2	1.4	1.2
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.70%	5.60%
Rate of compensation increase	2.50%	3.40%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	5.60%	4.90%	5.60%
Expected return on plan assets	5.50%	6.60%	6.80%
Rate of compensation increase	3.40%	3.10%	4.50%
Reduction in net periodic pension cost per 100 basis point increase in benefig obligation discount rate	0.3
Additional net periodic pension cost per 100 basis point decrease in expected retun on plan assets rate	$ 0.3
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, equity securities	70.00%
Targeted asset allocation, fixed income securities	25.00%
Targeted asset allocation, real estate funds	5.00%
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Equity securities	70.00%	76.00%
Fixed income securities	25.00%	22.00%
Real estate	5.00%	2.00%
Total	100.00%	100.00%