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Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) - Pension Plan - USD ($)
$ in Millions
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2023
Domestic Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 26.4 $ 134.5 $ 132.7
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2026 4.1    
2027 4.1    
2028 6.9    
2029 6.0    
2030 4.9    
2031-2035 25.6    
Domestic Plans | Level 1,2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 22.6 127.1  
Domestic Plans | Level 1,2 and 3 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 10.9 63.8  
Domestic Plans | Level 1,2 and 3 | U.S. Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 5.2 34.4  
Domestic Plans | Level 1,2 and 3 | Domestic large cap equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 1.7 11.5  
Domestic Plans | Level 1,2 and 3 | Foreign equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 1.4 6.7  
Domestic Plans | Level 1,2 and 3 | Collective trust: Domestic small cap equities      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.6 4.9  
Domestic Plans | Level 1,2 and 3 | Short-term fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 2.8 5.8  
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 | U.S. Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0 0.0  
Domestic Plans | Level 1 | Domestic large cap equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 1.7 11.5  
Domestic Plans | Level 1 | Foreign equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 1.4 6.7  
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 2.8 5.8  
Domestic Plans | Level 2 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 10.9 63.8  
Domestic Plans | Level 2 | U.S. Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 5.2 34.4  
Domestic Plans | Level 2 | Domestic large cap equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0 0.0  
Domestic Plans | Level 2 | 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 0.6 4.9  
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 | U.S. Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0 0.0  
Domestic Plans | Level 3 | Domestic large cap equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0 0.0  
Domestic Plans | Level 3 | 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 3.8 7.4  
Domestic Plans | NAV | Real estate fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3.8 7.4  
International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 28.9 34.6 $ 32.1
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2026 2.0    
2027 2.1    
2028 2.3    
2029 2.4    
2030 2.6    
2031-2035 16.8    
International Plans | Insurance policy      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 28.8    
International Plans | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   32.1  
International Plans | Short-term fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.1 0.2  
International Plans | Multi-strategy investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   2.3  
International Plans | Level 1 | Insurance policy      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0    
International Plans | Level 1 | Fixed-income investments      
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 0.1 0.2  
International Plans | Level 1 | Multi-strategy investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0.0  
International Plans | Level 2 | Insurance policy      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0    
International Plans | Level 2 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   32.1  
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  
International Plans | Level 3 | Insurance policy      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 28.8    
International Plans | Level 3 | Fixed-income investments      
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