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Fair Value Measurements (Tables)
6 Months Ended
Feb. 28, 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 of our financial instruments were as follows as of the dates presented (in millions):
 February 28, 2021August 31, 2020
 Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Investments in unconsolidated affiliates$5.5 $5.5 $6.0 $6.0 
Liabilities:  
Senior unsecured public notes, net of unamortized discount and deferred costs$494.0 $490.8 $— $— 
Borrowings under Term Loan Facility— — 395.0 395.0 
Industrial revenue bond4.0 4.0 4.0 4.0 
Bank loans— — 2.1 2.3