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Debt and Lines of Credit (Tables)
12 Months Ended
Aug. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The Company’s debt at August 31, 2017 and 2016 consisted of the following (in millions):
 
August 31,
 
2017
 
2016
Senior unsecured public notes due December 2019, principal
$
350.0

 
$
350.0

Senior unsecured public notes due December 2019, unamortized discount and deferred costs
(0.9
)
 
(1.3
)
Industrial revenue bond due June 2021
4.0

 
4.0

Bank loans
3.8

 
2.5

Total debt outstanding, net of unamortized discount and deferred costs
$
356.9

 
$
355.2