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Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) - Pension Plan - USD ($)
$ in Millions
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Domestic Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 132.7 $ 141.5 $ 182.6
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2024 11.7    
2025 12.5    
2026 14.2    
2027 13.2    
2028 12.4    
2029-2033 62.3    
Domestic Plans | Level 1 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0    
Domestic Plans | Level 1 | US Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0.0    
Domestic Plans | Level 1 | Mutual Funds, Domestic large cap equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 13.0 23.7  
Domestic Plans | Level 1 | Mutual Funds, Foreign equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 6.5 12.6  
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 4.4 2.1  
Domestic Plans | Level 2 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 58.2    
Domestic Plans | Level 2 | US Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 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 4.8 8.4  
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    
Domestic Plans | Level 3 | US Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 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 123.8 46.8  
Domestic Plans | Level 1,2 and 3 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 58.2    
Domestic Plans | Level 1,2 and 3 | US Treasury investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 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 13.0 23.7  
Domestic Plans | Level 1,2 and 3 | Mutual Funds, Foreign equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 6.5 12.6  
Domestic Plans | Level 1,2 and 3 | Collective trust: Domestic small cap equities      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 4.8 8.4  
Domestic Plans | Level 1,2 and 3 | Short-term fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 4.4 2.1  
Domestic Plans | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 8.9 94.7  
Domestic Plans | NAV | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   84.5  
Domestic Plans | NAV | Real estate fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 8.9 10.2  
International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 32.1 28.5 $ 42.2
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2024 1.7    
2025 1.8    
2026 1.9    
2027 2.1    
2028 2.3    
2029-2033 15.0    
International Plans | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 8.8 6.2  
International Plans | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 5.2 4.8  
International Plans | Short-term fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 7.1 0.3  
International Plans | Multi-strategy investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 11.0 17.2  
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 0.0  
International Plans | Level 1 | Short-term fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 7.1 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 2 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 8.8 6.2  
International Plans | Level 2 | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 5.2 4.8  
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 11.0 17.2  
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 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