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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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