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Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) - Pension Plan - USD ($) $ in Millions | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
--- | --- | --- | ---
Domestic Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 182.6 | $ 167.1 | $ 151.5
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2022 | 13.2 |  |
2023 | 11.9 |  |
2024 | 12.0 |  |
2025 | 12.9 |  |
2026 | 14.8 |  |
2027-2031 | 65.0 |  |
Domestic Plans | Level 1 | Mutual Funds, Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 38.9 | 55.6 |
Domestic Plans | Level 1 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 23.1 | 26.0 |
Domestic Plans | 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 | Level 1 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.9 | 5.2 |
Domestic Plans | 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 | Level 2 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Level 2 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 13.3 | 15.7 |
Domestic Plans | Level 2 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | 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 | Level 3 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | 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 | Level 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Level 1,2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 82.2 | 102.5 |
Domestic Plans | Level 1,2 and 3 | Mutual Funds, Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 38.9 | 55.6 |
Domestic Plans | Level 1,2 and 3 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 23.1 | 26.0 |
Domestic Plans | Level 1,2 and 3 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 13.3 | 15.7 |
Domestic Plans | Level 1,2 and 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.9 | 5.2 |
Domestic Plans | NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 100.4 | 64.6 |
Domestic Plans | NAV | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 92.3 | 57.0 |
Domestic Plans | NAV | Real estate fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 8.1 | 7.6 |
International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 42.2 | 35.1 | $ 30.7
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2022 | 1.2 |  |
2023 | 1.3 |  |
2024 | 1.3 |  |
2025 | 1.4 |  |
2026 | 1.4 |  |
2027-2031 | 8.4 |  |
International Plans | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.8 | 27.0 |
International Plans | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1.0 | 0.3 |
International Plans | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 26.9 | 3.3 |
International Plans | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 7.5 | 4.5 |
International Plans | Level 1 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 1 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1.0 | 0.3 |
International Plans | Level 1 | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 1 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 2 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.8 | 27.0 |
International Plans | Level 2 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 2 | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 26.9 | 3.3 |
International Plans | Level 2 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 7.5 | 4.5 |
International Plans | Level 3 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 3 | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 3 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 0.0 | $ 0.0 |

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