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Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) - Pension Plan - USD ($) $ in Millions | Aug. 31, 2022 | Aug. 31, 2021 | Aug. 31, 2020
--- | --- | --- | ---
Domestic Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 141.5 | $ 182.6 | $ 167.1
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2023 | 12.0 |  |
2024 | 12.0 |  |
2025 | 13.0 |  |
2026 | 14.6 |  |
2027 | 13.6 |  |
2028-2032 | 63.9 |  |
Domestic Plans | Level 1 | Mutual Funds, Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 23.7 | 38.9 |
Domestic Plans | Level 1 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 12.6 | 23.1 |
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 | 2.1 | 6.9 |
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 | 8.4 | 13.3 |
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 | 46.8 | 82.2 |
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 | 23.7 | 38.9 |
Domestic Plans | Level 1,2 and 3 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 12.6 | 23.1 |
Domestic Plans | Level 1,2 and 3 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 8.4 | 13.3 |
Domestic Plans | Level 1,2 and 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2.1 | 6.9 |
Domestic Plans | NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 94.7 | 100.4 |
Domestic Plans | NAV | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 84.5 | 92.3 |
Domestic Plans | NAV | Real estate fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 10.2 | 8.1 |
International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 28.5 | 42.2 | $ 35.1
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2023 | 1.3 |  |
2024 | 1.3 |  |
2025 | 1.5 |  |
2026 | 1.5 |  |
2027 | 1.6 |  |
2028-2032 | 10.7 |  |
International Plans | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 4.8 | 6.8 |
International Plans | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.3 | 1.0 |
International Plans | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 17.2 | 26.9 |
International Plans | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.2 | 7.5 |
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 | 0.3 | 1.0 |
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 | 4.8 | 6.8 |
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 | 17.2 | 26.9 |
International Plans | Level 2 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.2 | 7.5 |
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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