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Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) - Pension Plan - USD ($)
$ in Millions
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Domestic Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 182.6 $ 167.1 $ 151.5
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2022 13.2    
2023 11.9    
2024 12.0    
2025 12.9    
2026 14.8    
2027-2031 65.0    
Domestic Plans | Level 1 | Mutual Funds, Domestic large cap equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 38.9 55.6  
Domestic Plans | Level 1 | Mutual Funds, Foreign equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 23.1 26.0  
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 6.9 5.2  
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 13.3 15.7  
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 82.2 102.5  
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 38.9 55.6  
Domestic Plans | Level 1,2 and 3 | Mutual Funds, Foreign equity fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 23.1 26.0  
Domestic Plans | Level 1,2 and 3 | Collective trust: Domestic small cap equities      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 13.3 15.7  
Domestic Plans | Level 1,2 and 3 | Short-term fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 6.9 5.2  
Domestic Plans | NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 100.4 64.6  
Domestic Plans | NAV | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 92.3 57.0  
Domestic Plans | NAV | Real estate fund      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 8.1 7.6  
International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 42.2 35.1 $ 30.7
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2022 1.2    
2023 1.3    
2024 1.3    
2025 1.4    
2026 1.4    
2027-2031 8.4    
International Plans | Equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 6.8 27.0  
International Plans | Short-term fixed income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 1.0 0.3  
International Plans | Multi-strategy investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 26.9 3.3  
International Plans | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 7.5 4.5  
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 1.0 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 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 6.8 27.0  
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 26.9 3.3  
International Plans | Level 2 | Fixed-income investments      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 7.5 4.5  
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