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Significant Accounting Policies - Components of Other Comprehensive Income Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Foreign currency translation adjustments - Before Tax Amount
Foreign currency translation adjustments	$ (11.5)	$ (25.2)	$ 19.0
Foreign currency translation adjustments - Tax (Expense) or Benefit
Foreign currency translation adjustments	0.0	0.0	0.0
Foreign currency translation adjustments - Net of Tax Amount
Foreign currency translation adjustments	(11.5)	(25.2)	19.0
Defined benefit pension plans - Before Tax Amounts
Actuarial (losses) gains	(40.8)	18.4	18.3
Amortization of Defined benefit pension items - Prior service cost	3.5	3.1	3.1
Amortization of Defined benefit pension items - Actuarial losses	4.1	6.8	8.9
Amortization of Defined benefit pension items - Settlement losses	0.4	0.0	0.0
Total defined benefit plans, net - before tax	(32.8)	28.3	30.3
Defined benefit pension plans - Tax (Expense) or Benefit
Actuarial (losses) gains	9.7	(4.4)	(5.7)
Amortization of Defined benefit pension items - Prior service cost	(0.9)	(0.7)	(0.7)
Amortization of Defined benefit pension items - Actuarial losses	(1.0)	(2.0)	(3.2)
Amortization of Defined benefit pension items - Settlement losses	(0.1)	0.0	0.0
Total defined benefit plans, net - tax	7.7	(7.1)	(9.6)
Defined benefit pension plans - Net of Tax Amount
Actuarial (losses) gains	(31.1)	14.0	12.6
Amortization of Defined benefit pension items - Prior service cost	2.6	2.4	2.4
Amortization of Defined benefit pension items - Actuarial losses	3.1	4.8	5.7
Amortization of Defined benefit pension items - Settlement losses	0.3	0.0	0.0
Total defined benefit plans, net - net of tax	(25.1)	21.2	20.7
Other comprehensive (loss) income before tax	(44.3)	3.1	49.3
Other comprehensive (loss) income, tax	7.7	(7.1)	(9.6)
Other comprehensive (loss) income items, net of tax	$ (36.6)	$ (4.0)	$ 39.7

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