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Fair Value Measurements (Tables)
12 Months Ended
Aug. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Carrying Value and Estimated Fair Value of Financial Instruments
The carrying values and estimated fair values of certain financial instruments as of the dates presented were as follows (in millions):
 August 31, 2021August 31, 2020
 Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Investments in debt and equity securities$5.3 $5.3 $6.0 $6.0 
Liabilities:  
Senior unsecured public notes, net of unamortized discount and deferred costs$494.3 $496.5 $— $— 
Borrowings under Term Loan Facility— — 395.0 395.0 
Industrial revenue bond— — 4.0 4.0 
Bank loans— — 2.1 2.3