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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, 2022 | Feb. 28, 2021 | Feb. 28, 2022 | Feb. 28, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income, before tax | $ 6.4 | $ 8.7 | $ (3.9) | $ 15.4
Other comprehensive (loss) income, tax | (0.4) | (0.3) | (0.8) | (0.8)
Other comprehensive income (loss) items, net of tax | 6.0 | 8.4 | (4.7) | 14.6
Foreign currency translation adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income, before tax | 4.8 | 6.7 | (7.1) | 11.3
Other comprehensive (loss) income, tax | 0.0 | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) items, net of tax | 4.8 | 6.7 | (7.1) | 11.3
Prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of defined benefit pension items, before tax | 0.7 | 0.7 | 1.4 | 1.4
Amortization of defined benefit pension items, tax | (0.2) | (0.1) | (0.4) | (0.3)
Amortization of defined benefit pension items, after tax | 0.5 | 0.6 | 1.0 | 1.1
Actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of defined benefit pension items, before tax | 0.9 | 1.3 | 1.8 | 2.7
Amortization of defined benefit pension items, tax | (0.2) | (0.2) | (0.4) | (0.5)
Amortization of defined benefit pension items, after tax | 0.7 | 1.1 | 1.4 | 2.2
Total defined benefit pension plans, net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive (loss) income, before tax | 1.6 | 2.0 | 3.2 | 4.1
Other comprehensive (loss) income, tax | (0.4) | (0.3) | (0.8) | (0.8)
Other comprehensive income (loss) items, net of tax | $ 1.2 | $ 1.7 | $ 2.4 | $ 3.3

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- Definition Amount before tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569616-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123454820&loc=SL4569643-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 + Details
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