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Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) - Pension Plan - USD ($) $ in Millions | Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022
--- | --- | --- | ---
Domestic Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 134.5 | $ 132.7 | $ 141.5
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2025 | 12.7 |  |
2026 | 12.3 |  |
2027 | 12.0 |  |
2028 | 14.8 |  |
2029 | 13.8 |  |
2030-2034 | 62.6 |  |
Domestic Plans | Level 1,2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 127.1 | 123.8 |
Domestic Plans | Level 1,2 and 3 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 63.8 | 58.2 |
Domestic Plans | Level 1,2 and 3 | US Treasury investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 34.4 | 36.9 |
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 | 11.5 | 13.0 |
Domestic Plans | Level 1,2 and 3 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.7 | 6.5 |
Domestic Plans | Level 1,2 and 3 | Collective trust: Domestic small cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 4.9 | 4.8 |
Domestic Plans | Level 1,2 and 3 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 5.8 | 4.4 |
Domestic Plans | Level 1 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Level 1 | US Treasury investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Level 1 | Mutual Funds, Domestic large cap equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 11.5 | 13.0 |
Domestic Plans | Level 1 | Mutual Funds, Foreign equity fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 6.7 | 6.5 |
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 | 5.8 | 4.4 |
Domestic Plans | Level 2 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 63.8 | 58.2 |
Domestic Plans | Level 2 | US Treasury investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 34.4 | 36.9 |
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 | 4.9 | 4.8 |
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 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
Domestic Plans | Level 3 | US Treasury 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 | NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 7.4 | 8.9 |
Domestic Plans | NAV | Real estate fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 7.4 | 8.9 |
International Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 34.6 | 32.1 | $ 28.5
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2025 | 1.8 |  |
2026 | 1.8 |  |
2027 | 1.9 |  |
2028 | 2.1 |  |
2029 | 2.2 |  |
2030-2034 | 14.6 |  |
International Plans | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 32.1 | 8.8 |
International Plans | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 5.2 |
International Plans | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.2 | 7.1 |
International Plans | Multi-strategy investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2.3 | 11.0 |
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 1 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0.0 |
International Plans | Level 1 | Short-term fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.2 | 7.1 |
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 2 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 32.1 | 8.8 |
International Plans | Level 2 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 5.2 |
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 | 2.3 | 11.0 |
International Plans | Level 3 | Fixed-income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0.0 | 0.0 |
International Plans | Level 3 | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 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 |

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