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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