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Earnings Per Share (Tables)
 12 Months Ended
Nov. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
The following table summarizes the computation of earnings per common share and earnings per common share, assuming dilution:
 
Years Ended November 30,
 
2018
 
2017
 
2016
 
(Dollars and shares in millions except per share data)
Numerator:
 
 
 
 
 
Net income (loss)
$
20.7

 
$
(87.8
)
 
$
(0.4
)
 
 
 
 
 
 
Denominator for basic earnings per share - weighted average shares outstanding
44.6

 
44.4

 
44.0

Effect of dilutive securities
0.3

 
—

 
—

Denominator for dilutive earnings per share - adjusted weighted average shares and assumed conversions
44.9

 
44.4

 
44.0

 
 
 
 
 
 
Net income (loss) per share - Basic and Diluted
$
0.46

 
$
(1.98
)
 
$
(0.01
)