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Fair Value Measurements (Details)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 31, 2021
USD ($)
investment
Nov. 30, 2020
USD ($)
Aug. 31, 2021
USD ($)
investment
Aug. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and cash equivalents $ 491.3   $ 491.3 $ 560.7  
Investments in debt and equity securities $ 5.3   $ 5.3 6.0  
Number of investments | investment 1   1    
Debt Securities $ 4.0   $ 4.0    
Asset impairments 2.0 $ 4.0 6.0 8.8 $ 0.0
Carrying Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments in debt and equity securities 5.3   5.3 6.0  
Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investments in debt and equity securities 5.3   5.3 6.0  
Senior unsecured public notes, net of unamortized discount and deferred costs | Carrying Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 494.3   494.3 0.0  
Senior unsecured public notes, net of unamortized discount and deferred costs | Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 496.5   496.5 0.0  
Borrowings under Term Loan Facility | Carrying Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 0.0   0.0 395.0  
Borrowings under Term Loan Facility | Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 0.0   0.0 395.0  
Industrial revenue bond | Carrying Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 0.0   0.0 4.0  
Industrial revenue bond | Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 0.0   0.0 4.0  
Bank loans | Carrying Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 0.0   0.0 2.1  
Bank loans | Fair Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying and estimated fair value of financial instruments 0.0   0.0 2.3  
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 $ 491.3   $ 491.3 $ 560.7