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Comprehensive Income - Tax Amounts Allocated to Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2020 | May 31, 2019 | May 31, 2020 | May 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | $ (11.4) | $ (6.9) | $ (8.4) | $ (5.5)
Other comprehensive income (loss), tax | (0.6) | (0.5) | (1.8) | (1.8)
Other comprehensive loss items, net of tax | (12.0) | (7.4) | (10.2) | (7.3)
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax | (13.8) | (8.7) | (15.6) | (12.6)
Other comprehensive income (loss), tax | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive loss items, net of tax | (13.8) | (8.7) | (15.6) | (12.6)
Actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Actuarial gain or loss, before amortization of defined benefit pensions items, before tax |  |  | 0.0 | 1.3
Actuarial gain or loss, before amortization of defined benefit pensions items, tax |  |  | 0.0 | (0.4)
Actuarial gain or loss, before amortization of defined benefit pensions items, after tax |  |  | 0.0 | 0.9
Amortization of defined benefit pension items, before tax | 1.4 | 1.0 | 4.2 | 3.1
Amortization of defined benefit pension items, tax | (0.4) | (0.3) | (1.1) | (0.8)
Amortization of defined benefit pension items, after tax | 1.0 | 0.7 | 3.1 | 2.3
Prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of defined benefit pension items, before tax | 1.0 | 0.8 | 3.0 | 2.3
Amortization of defined benefit pension items, tax | (0.2) | (0.2) | (0.7) | (0.5)
Amortization of defined benefit pension items, after tax | 0.8 | 0.6 | 2.3 | 1.8
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 | 1.8 | 7.2 | 7.1
Other comprehensive income (loss), tax | (0.6) | (0.5) | (1.8) | (1.8)
Other comprehensive loss items, net of tax | $ 1.8 | $ 1.3 | $ 5.4 | $ 5.3

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