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Pension and Defined Contribution Plans - Net Periodic Pension Cost and Pension Plan Asset Allocation (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Domestic Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss | $ 4.1 | $ 4.1 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 4.3 | 2.9 | $ 2.7
Interest cost | 6.4 | 7.7 | 7.3
Expected return on plan assets | (10.4) | (10.5) | (10.2)
Amortization of prior service cost | 4.0 | 3.5 | 3.1
Settlement | 0.0 | 0.4 | 0.0
Recognized actuarial loss | 4.2 | 2.7 | 4.5
Net periodic pension cost | $ 8.5 | $ 6.7 | $ 7.4
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Discount rate | 2.20% | 2.80% |
Rate of compensation increase | 5.00% | 5.00% |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 2.80% | 3.90% | 3.50%
Expected return on plan assets | 7.00% | 7.30% | 7.50%
Rate of compensation increase | 5.00% | 5.50% | 5.50%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate | $ 1.0 |  |
Additional net periodic pension cost per 100 basis point decrease in expected return on plan assets rate | $ 1.6 |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Pension plan asset allocation, percentage | 100.00% | 100.00% |
Domestic Plans | Equity securities |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 55.00% |  |
Pension plan asset allocation, percentage | 58.20% | 53.30% |
Domestic Plans | Fixed income securities |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 40.00% |  |
Pension plan asset allocation, percentage | 37.30% | 41.80% |
Domestic Plans | Real estate |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 5.00% |  |
Pension plan asset allocation, percentage | 4.50% | 4.90% |
Domestic Plans | Multi-strategy investments |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Pension plan asset allocation, percentage | 0.00% | 0.00% |
International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss | $ 0.6 | $ 1.4 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 0.3 | 0.2 | $ 0.2
Interest cost | 0.9 | 1.3 | 1.3
Expected return on plan assets | (2.0) | (1.9) | (2.2)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Settlement | 0.0 | 0.0 | 0.0
Recognized actuarial loss | 1.4 | 1.4 | 2.3
Net periodic pension cost | $ 0.6 | $ 1.0 | $ 1.6
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Discount rate | 1.90% | 2.00% |
Rate of compensation increase | 3.00% | 3.10% |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 2.00% | 2.90% | 2.50%
Expected return on plan assets | 6.50% | 6.50% | 6.50%
Rate of compensation increase | 3.00% | 3.10% | 3.10%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate | $ 1.0 |  |
Additional net periodic pension cost per 100 basis point decrease in expected return on plan assets rate | $ 0.3 |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Pension plan asset allocation, percentage | 100.00% | 100.00% |
International Plans | Equity securities |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 75.00% |  |
Pension plan asset allocation, percentage | 76.90% | 73.00% |
International Plans | Fixed income securities |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 15.00% |  |
Pension plan asset allocation, percentage | 13.70% | 17.10% |
International Plans | Real estate |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Pension plan asset allocation, percentage | 0.00% | 0.00% |
International Plans | Multi-strategy investments |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 10.00% |  |
Pension plan asset allocation, percentage | 9.40% | 9.90% |

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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