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Significant Accounting Policies - Components of Other Comprehensive Income Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Foreign currency translation adjustments - Net of Tax Amount |  |  |
Foreign currency translation adjustments | $ 13.3 | $ 11.9 | $ (11.5)
Defined benefit pension plans - Net of Tax Amount |  |  |
Tax adjustments, after tax | 27.2 | 11.3 |
Total defined benefit plans, net - net of tax | 21.2 | 6.8 | (25.1)
Other comprehensive income (loss) before tax | 43.1 | 20.8 | (44.3)
Other comprehensive income (loss), tax | (8.6) | (2.1) | 7.7
Other comprehensive income (loss) items, net of tax | 34.5 | 18.7 | (36.6)
Foreign Currency Items |  |  |
Foreign currency translation adjustments - Before Tax Amount |  |  |
Foreign currency translation adjustments | 13.3 | 11.9 | (11.5)
Foreign currency translation adjustments - Tax (Expense) or Benefit |  |  |
Foreign currency translation adjustments | 0.0 | 0.0 | 0.0
Foreign currency translation adjustments - Net of Tax Amount |  |  |
Foreign currency translation adjustments | 13.3 | 11.9 | (11.5)
Defined benefit pension plans - Net of Tax Amount |  |  |
Tax adjustments, after tax | 13.3 | 11.9 |
Other comprehensive income (loss) items, net of tax | 13.3 | 11.9 |
Tax adjustments |  |  |
Defined benefit pension plans - Before Tax Amounts |  |  |
Tax adjustments, before tax | 0.0 | 0.0 | 0.0
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Tax adjustments | (3.2) | 0.0 | 0.0
Defined benefit pension plans - Net of Tax Amount |  |  |
Tax adjustments, after tax | (3.2) | 0.0 | 0.0
Actuarial gains (losses) |  |  |
Defined benefit pension plans - Before Tax Amounts |  |  |
Actuarial gains (losses) | 17.5 | (0.7) | (40.8)
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Actuarial gains (losses) | (3.6) | 0.1 | 9.7
Defined benefit pension plans - Net of Tax Amount |  |  |
Actuarial gains (losses) | 13.9 | (0.6) | (31.1)
Prior service cost |  |  |
Defined benefit pension plans - Before Tax Amounts |  |  |
Amortization of Defined benefit pension items - Prior service cost | 2.9 | 4.0 | 3.5
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Amortization of Defined benefit pension items - Prior service cost | (0.6) | (0.9) | (0.9)
Defined benefit pension plans - Net of Tax Amount |  |  |
Amortization of Defined benefit pension items - Prior service cost | 2.3 | 3.1 | 2.6
Actuarial losses |  |  |
Defined benefit pension plans - Before Tax Amounts |  |  |
Amortization of Defined benefit pension items - Actuarial losses | 5.5 | 5.6 | 4.1
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Amortization of Defined benefit pension items - Actuarial losses | (1.2) | (1.3) | (1.0)
Defined benefit pension plans - Net of Tax Amount |  |  |
Amortization of Defined benefit pension items - Actuarial losses | 4.3 | 4.3 | 3.1
Settlement losses |  |  |
Defined benefit pension plans - Before Tax Amounts |  |  |
Amortization of Defined benefit pension items - Settlement losses | 3.9 | 0.0 | 0.4
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Amortization of Defined benefit pension items - Settlement losses | 0.0 | 0.0 | (0.1)
Defined benefit pension plans - Net of Tax Amount |  |  |
Amortization of Defined benefit pension items - Settlement losses | 3.9 | 0.0 | 0.3
Defined Benefit Pension Plans |  |  |
Defined benefit pension plans - Before Tax Amounts |  |  |
Total defined benefit plans, net - before tax | 29.8 | 8.9 | (32.8)
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Total defined benefit plans, net - tax | (8.6) | (2.1) | 7.7
Defined benefit pension plans - Net of Tax Amount |  |  |
Tax adjustments, after tax | 13.9 | (0.6) |
Total defined benefit plans, net - net of tax | 21.2 | 6.8 | $ (25.1)
Other comprehensive income (loss) items, net of tax | $ 21.2 | $ 6.8 |

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