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Comprehensive Income - Tax Amounts Allocated to Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2021 | Feb. 29, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | $ 8.7 | $ (1.3) | $ 15.4 | $ 3.0
Other comprehensive income (loss), tax | (0.3) | (0.7) | (0.8) | (1.2)
Other comprehensive income (loss) items, net of tax | 8.4 | (2.0) | 14.6 | 1.8
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | 6.7 | (3.7) | 11.3 | (1.8)
Other comprehensive income (loss), tax | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) items, net of tax | 6.7 | (3.7) | 11.3 | (1.8)
Prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of defined benefit pension items, before tax | 0.7 | 1.0 | 1.4 | 2.0
Amortization of defined benefit pension items, tax | (0.1) | (0.3) | (0.3) | (0.5)
Amortization of defined benefit pension items, after tax | 0.6 | 0.7 | 1.1 | 1.5
Actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of defined benefit pension items, before tax | 1.3 | 1.4 | 2.7 | 2.8
Amortization of defined benefit pension items, tax | (0.2) | (0.4) | (0.5) | (0.7)
Amortization of defined benefit pension items, after tax | 1.1 | 1.0 | 2.2 | 2.1
Total defined benefit pension plans, net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | 2.0 | 2.4 | 4.1 | 4.8
Other comprehensive income (loss), tax | (0.3) | (0.7) | (0.8) | (1.2)
Other comprehensive income (loss) items, net of tax | $ 1.7 | $ 1.7 | $ 3.3 | $ 3.6

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