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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, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Domestic Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net actuarial loss | $ 4.1 | $ 2.9 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 2.9 | 2.7 | $ 3.5
Interest cost | 7.7 | 7.3 | 6.9
Expected return on plan assets | (10.5) | (10.2) | (9.4)
Amortization of prior service cost | 3.5 | 3.1 | 3.1
Settlement | 0.4 | 0.0 | 0.0
Recognized actuarial loss | 2.7 | 4.5 | 5.3
Net periodic pension cost | $ 6.7 | $ 7.4 | $ 9.4
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Discount rate | 2.80% | 3.90% |
Rate of compensation increase | 5.00% | 5.50% |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 3.90% | 3.50% | 3.20%
Expected return on plan assets | 7.30% | 7.50% | 7.50%
Rate of compensation increase | 5.50% | 5.50% | 5.50%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate | $ 1.4 |  |
Additional net periodic pension cost per 100 basis point decrease in expected return on plan assets rate | $ 1.5 |  |
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 | 53.30% | 57.50% |
Domestic Plans | Fixed income securities |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 40.00% |  |
Pension plan asset allocation, percentage | 41.80% | 37.80% |
Domestic Plans | Real estate |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 5.00% |  |
Pension plan asset allocation, percentage | 4.90% | 4.70% |
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 | $ 1.4 | $ 1.5 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 0.2 | 0.2 | $ 0.2
Interest cost | 1.3 | 1.3 | 1.1
Expected return on plan assets | (1.9) | (2.2) | (1.9)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Settlement | 0.0 | 0.0 | 0.0
Recognized actuarial loss | 1.4 | 2.3 | 3.6
Net periodic pension cost | $ 1.0 | $ 1.6 | $ 3.0
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] |  |  |
Discount rate | 2.00% | 2.90% |
Rate of compensation increase | 3.10% | 3.10% |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount rate | 2.90% | 2.50% | 2.10%
Expected return on plan assets | 6.50% | 6.50% | 6.50%
Rate of compensation increase | 3.10% | 3.10% | 3.20%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate | $ 1.2 |  |
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 | 73.00% | 61.90% |
International Plans | Fixed income securities |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Targeted asset allocation, percentage | 15.00% |  |
Pension plan asset allocation, percentage | 17.10% | 25.50% |
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 | 9.90% | 12.60% |

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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/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 3: 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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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -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 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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