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Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) $ in Millions | 12 Months Ended
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Aug. 31, 2020 USD ($) multiemployer_plan | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($)
Pension Plan |  |  |
Multiemployer Plan, Pension, Significant [Abstract] |  |  |
Number of multi-employer plans | multiemployer_plan | 2 |  |
Contributions to multi-employer plans | $ 0.6 | $ 0.5 | $ 0.5
Defined Contribution Plan |  |  |
Defined Benefit Plan, Additional Information [Abstract] |  |  |
Defined contribution plan, cost recognized | 8.2 | 8.1 | 8.0
Common stock included in defined contribution plan, market value | $ 5.9 |  |
Common stock included in defined contribution plan as percentage of total fair value of assets in plan | 1.50% |  |
Domestic Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 167.1 | 151.5 | 149.4
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2021 | 12.8 |  |
2022 | 11.7 |  |
2023 | 23.3 |  |
2024 | 17.9 |  |
2025 | 13.0 |  |
2026-2030 | 67.6 |  |
Domestic Plans | Pension Plan | Level 1 | Mutual Funds: Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 55.6 | 45.6 |
Domestic Plans | Pension Plan | Level 1 | Mutual Funds: Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 26.0 | 20.5 |
Domestic Plans | Pension Plan | Level 1 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 1 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 5.2 | 6.0 |
Domestic Plans | Pension Plan | Level 2 | Mutual Funds: Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 2 | Mutual Funds: Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 2 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 15.7 | 14.6 |
Domestic Plans | Pension Plan | Level 2 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 3 | Mutual Funds: Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 3 | Mutual Funds: Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 3 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Pension Plan | Level 1,2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 102.5 | 86.7 |
Domestic Plans | Pension Plan | Level 1,2 and 3 | Mutual Funds: Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 55.6 | 45.6 |
Domestic Plans | Pension Plan | Level 1,2 and 3 | Mutual Funds: Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 26.0 | 20.5 |
Domestic Plans | Pension Plan | Level 1,2 and 3 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 15.7 | 14.6 |
Domestic Plans | Pension Plan | Level 1,2 and 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 5.2 | 6.0 |
Domestic Plans | Pension Plan | NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 64.6 | 64.8 |
Domestic Plans | Pension Plan | NAV | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 57.0 | 57.4 |
Domestic Plans | Pension Plan | NAV | Real estate fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 7.6 | 7.4 |
International Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 35.1 | 30.7 | $ 30.9
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2021 | 1.1 |  |
2022 | 1.2 |  |
2023 | 1.2 |  |
2024 | 1.3 |  |
2025 | 1.3 |  |
2026-2030 | 7.5 |  |
International Plans | Pension Plan | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 27.0 | 22.4 |
International Plans | Pension Plan | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.3 | 0.3 |
International Plans | Pension Plan | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 3.3 | 3.0 |
International Plans | Pension Plan | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 4.5 | 5.0 |
International Plans | Pension Plan | Level 1 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Pension Plan | Level 1 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.3 | 0.3 |
International Plans | Pension Plan | Level 1 | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Pension Plan | Level 1 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Pension Plan | Level 2 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 27.0 | 22.4 |
International Plans | Pension Plan | Level 2 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Pension Plan | Level 2 | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 3.3 | 3.0 |
International Plans | Pension Plan | Level 2 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 4.5 | 5.0 |
International Plans | Pension Plan | Level 3 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Pension Plan | Level 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Pension Plan | Level 3 | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Pension Plan | Level 3 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | $ 0.0 |
Qualified Plan | Domestic Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer expected contribution to defined benefit plans in next fiscal year | 1.0 |  |
Qualified Plan | International Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer expected contribution to defined benefit plans in next fiscal year | $ 1.2 |  |

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