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Significant Accounting Policies - Components of Other Comprehensive Income Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Foreign currency translation adjustments - Before Tax Amount |  |  |
Foreign currency translation adjustments | $ (11.5) | $ (25.2) | $ 19.0
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 | (11.5) | (25.2) | 19.0
Defined benefit pension plans - Before Tax Amounts |  |  |
Actuarial (losses) gains | (40.8) | 18.4 | 18.3
Amortization of Defined benefit pension items - Prior service cost | 3.5 | 3.1 | 3.1
Amortization of Defined benefit pension items - Actuarial losses | 4.1 | 6.8 | 8.9
Amortization of Defined benefit pension items - Settlement losses | 0.4 | 0.0 | 0.0
Total defined benefit plans, net - before tax | (32.8) | 28.3 | 30.3
Defined benefit pension plans - Tax (Expense) or Benefit |  |  |
Actuarial (losses) gains | 9.7 | (4.4) | (5.7)
Amortization of Defined benefit pension items - Prior service cost | (0.9) | (0.7) | (0.7)
Amortization of Defined benefit pension items - Actuarial losses | (1.0) | (2.0) | (3.2)
Amortization of Defined benefit pension items - Settlement losses | (0.1) | 0.0 | 0.0
Total defined benefit plans, net - tax | 7.7 | (7.1) | (9.6)
Defined benefit pension plans - Net of Tax Amount |  |  |
Actuarial (losses) gains | (31.1) | 14.0 | 12.6
Amortization of Defined benefit pension items - Prior service cost | 2.6 | 2.4 | 2.4
Amortization of Defined benefit pension items - Actuarial losses | 3.1 | 4.8 | 5.7
Amortization of Defined benefit pension items - Settlement losses | 0.3 | 0.0 | 0.0
Total defined benefit plans, net - net of tax | (25.1) | 21.2 | 20.7
Other comprehensive (loss) income before tax | (44.3) | 3.1 | 49.3
Other comprehensive (loss) income, tax | 7.7 | (7.1) | (9.6)
Other comprehensive (loss) income items, net of tax | $ (36.6) | $ (4.0) | $ 39.7

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