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Fair Value Measurements (Tables)
9 Months Ended
May 31, 2019
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 at May 31, 2019 and August 31, 2018 (in millions):
 
May 31, 2019
 
August 31, 2018
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Senior unsecured public notes, net of unamortized discount and deferred costs
$
349.8

 
$
355.1

 
$
349.5

 
$
361.7

Industrial revenue bond
4.0

 
4.0

 
4.0

 
4.0

Bank loans
2.8

 
3.0

 
3.3

 
3.3