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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 | 9 Months Ended
--- | --- | ---
May 31, 2026 | May 31, 2025 | May 31, 2026 | May 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax Amount | $ (10.8) | $ 28.4 | $ 5.3 | $ 0.7
Tax (Expense) Benefit | (0.1) | (0.1) | (0.4) | (0.4)
Other comprehensive (loss) income items, net of tax | (10.9) | 28.3 | 4.9 | 0.3
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax Amount | (11.2) | 27.8 | 4.1 | (1.2)
Tax (Expense) Benefit | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive (loss) income items, net of tax | (11.2) | 27.8 | 4.1 | (1.2)
Actuarial losses on defined benefit pension plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Before Tax Amount | 0.4 | 0.6 | 1.2 | 1.9
Tax (Expense) Benefit | (0.1) | (0.1) | (0.4) | (0.4)
Other comprehensive (loss) income items, net of tax | $ 0.3 | $ 0.5 | $ 0.8 | $ 1.5

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