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Comprehensive Income - Tax Amounts Allocated to Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ 4.3	$ (5.2)
Other comprehensive income (loss), tax	(0.5)	(1.0)
Other comprehensive income (loss) items, net of tax	3.8	(6.2)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	1.9	(8.8)
Other comprehensive income (loss), tax	0.0	0.0
Other comprehensive income (loss) items, net of tax	1.9	(8.8)
Prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of defined benefit pension items, before tax	1.0	0.8
Amortization of defined benefit pension items, tax	(0.2)	(0.2)
Amortization of defined benefit pension items, after tax	0.8	0.6
Actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Actuarial loss, before amortization of defined benefit pensions items, before tax	0.0	1.3
Actuarial loss, before amortization of defined benefit pensions items, tax	0.0	(0.4)
Actuarial loss, before amortization of defined benefit pensions items, after tax	0.0	0.9
Amortization of defined benefit pension items, before tax	1.4	1.1
Amortization of defined benefit pension items, tax	(0.3)	(0.3)
Amortization of defined benefit pension items, after tax	1.1	0.8
Settlement losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of defined benefit pension items, before tax	0.0	0.4
Amortization of defined benefit pension items, tax	0.0	(0.1)
Amortization of defined benefit pension items, after tax	0.0	0.3
Total defined benefit pension plans, net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	2.4	3.6
Other comprehensive income (loss), tax	(0.5)	(1.0)
Other comprehensive income (loss) items, net of tax	$ 1.9	$ 2.6

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