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Significant Accounting Policies - Components of Other Comprehensive Income Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Foreign currency translation adjustments - Before Tax Amount |  |  |
Foreign currency translation adjustments | $ 11.9 | $ (11.5) | $ (25.2)
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 | 11.9 | (11.5) | (25.2)
Defined benefit pension plans - Before Tax Amounts |  |  |
Actuarial (losses) gains | (0.7) | (40.8) | 18.4
Amortization of Defined benefit pension items - Prior service cost | 4.0 | 3.5 | 3.1
Amortization of Defined benefit pension items - Actuarial losses | 5.6 | 4.1 | 6.8
Amortization of Defined benefit pension items - Settlement losses | 0.0 | 0.4 | 0.0
Total defined benefit plans, net - before tax | 8.9 | (32.8) | 28.3
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Actuarial (losses) gains | 0.1 | 9.7 | (4.4)
Amortization of Defined benefit pension items - Prior service cost | (0.9) | (0.9) | (0.7)
Amortization of Defined benefit pension items - Actuarial losses | (1.3) | (1.0) | (2.0)
Amortization of Defined benefit pension items - Settlement losses | 0.0 | (0.1) | 0.0
Total defined benefit plans, net - tax | (2.1) | 7.7 | (7.1)
Defined benefit pension plans - Net of Tax Amount |  |  |
Actuarial (losses) gains | (0.6) | (31.1) | 14.0
Amortization of Defined benefit pension items - Prior service cost | 3.1 | 2.6 | 2.4
Amortization of Defined benefit pension items - Actuarial losses | 4.3 | 3.1 | 4.8
Amortization of Defined benefit pension items - Settlement losses | 0.0 | 0.3 | 0.0
Total defined benefit plans, net - net of tax | 6.8 | (25.1) | 21.2
Other comprehensive income (loss) before tax | 20.8 | (44.3) | 3.1
Other comprehensive income (loss), tax | (2.1) | 7.7 | (7.1)
Other comprehensive income (loss) items, net of tax | $ 18.7 | $ (36.6) | $ (4.0)

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