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Fair Value Measurements - Schedule of Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Aug. 31, 2024
Aug. 31, 2023
Feb. 28, 2023
Preferred Stock      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other investments     $ 2.5
Fair value measured on recurring basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total $ 852.5 $ 405.5  
Fair value measured on recurring basis | Level 1,2 and 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 845.8 397.9  
Other financial instruments 0.0 0.4  
Assets in fair value hierarchy 845.8 398.3  
Fair value measured on recurring basis | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 845.8 397.9  
Other financial instruments 0.0 0.0  
Assets in fair value hierarchy 845.8 397.9  
Total 845.8 397.9  
Fair value measured on recurring basis | 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 0.0 0.4  
Assets in fair value hierarchy 0.0 0.4  
Total 0.0 0.4  
Fair value measured on recurring basis | 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 0.0 0.0  
Fair value measured on recurring basis | Other investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other investments $ 6.7 $ 7.2