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Fair Value Measurements - Schedule of Carrying Value and Estimated Fair Value of Financial Instruments (Details) - Fair value measured on recurring basis - USD ($)
$ in Millions
Aug. 31, 2023
Aug. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value $ 405.5 $ 235.1
Level 1,2 and 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 397.9 223.2
Other financial instruments 0.4 0.0
Assets in fair value hierarchy 398.3 223.2
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 397.9 223.2
Other financial instruments 0.0 0.0
Assets in fair value hierarchy 397.9 223.2
Total assets at fair value 397.9 223.2
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0.0 0.0
Other financial instruments 0.4 0.0
Assets in fair value hierarchy 0.4 0.0
Total assets at fair value 0.4 0.0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0.0 0.0
Other financial instruments 0.0 0.0
Assets in fair value hierarchy 0.0 0.0
Total assets at fair value 0.0 0.0
Other investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 7.2 $ 11.9