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Comprehensive Income - Schedule of Tax Expense or Benefit Allocated to Each Component of Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 29, 2024 | Feb. 28, 2023 | Feb. 29, 2024 | Feb. 28, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income, before tax | $ 1.5 | $ 0.2 | $ 0.2 | $ 0.2
Other comprehensive (loss) income, tax (expense) benefit | (0.1) | (0.3) | (0.3) | (0.7)
Other comprehensive income (loss) items, net of tax | 1.4 | (0.1) | (0.1) | (0.5)
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income, before tax | 0.7 | (1.1) | (1.4) | (2.6)
Other comprehensive (loss) income, tax (expense) benefit | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) items, net of tax | 0.7 | (1.1) | (1.4) | (2.6)
Prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of defined benefit pension items, before tax | 0.0 | 0.6 | 0.0 | 1.3
Amortization of defined benefit pension items, tax (expense) benefit | 0.0 | (0.1) | 0.0 | (0.3)
Amortization of defined benefit pension items, net of tax | 0.0 | 0.5 | 0.0 | 1.0
Actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of defined benefit pension items, before tax | 0.8 | 0.7 | 1.6 | 1.5
Amortization of defined benefit pension items, tax (expense) benefit | (0.1) | (0.2) | (0.3) | (0.4)
Amortization of defined benefit pension items, net of tax | 0.7 | 0.5 | 1.3 | 1.1
Total defined benefit pension plans, net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income, before tax | 0.8 | 1.3 | 1.6 | 2.8
Other comprehensive (loss) income, tax (expense) benefit | (0.1) | (0.3) | (0.3) | (0.7)
Other comprehensive income (loss) items, net of tax | $ 0.7 | $ 1.0 | $ 1.3 | $ 2.1

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