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Income (Loss) Per Share of Common Stock (Tables)
 6 Months Ended
May. 31, 2015
Earnings Per Share [Abstract]  
Summary of Reconciliation of Numerator and Denominator Used to Calculate Basic and Diluted Loss Per Share of Common Stock
A reconciliation of the numerator and denominator used to calculate basic and diluted income (loss) per share of common stock (“EPS”) is presented in the following table:

 
Three Months Ended May 31,
 
Six Months Ended May 31,
 
2015
 
2014
 
2015
 
2014
 
(In millions, except per share amounts)
Numerator:
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
18.4

 
$
(50.1
)
 
$
14.3

 
$
(52.4
)
(Loss) income from discontinued operations, net of income taxes
—

 
(0.8
)
 
0.2

 
(0.8
)
Net income (loss)
18.4

 
(50.9
)
 
14.5

 
(53.2
)
Income allocated to participating securities
(0.5
)
 
—

 
(0.4
)
 
—

Net income (loss) for basic earnings per share
17.9

 
(50.9
)
 
14.1

 
(53.2
)
Interest on convertible subordinated debentures
1.0

 
—

 
2.2

 
—

Net income (loss) for diluted earnings per share
18.9

 
(50.9
)
 
16.3

 
(53.2
)
Denominator:
 
 
 
 
 
 
 
Basic weighted average shares
61.2

 
57.9

 
59.9

 
58.7

Effect of:
 
 
 
 
 
 
 
4 1/16% Convertible Subordinated Debentures (“4 1/16% Debentures”)
10.9

 
—

 
12.0

 
—

  Employee stock options and stock purchase plan
0.2

 
—

 
0.3

 
—

Diluted weighted average shares
72.3

 
57.9

 
72.2

 
58.7

Basic
 
 
 
 
 
 
 
Income (loss) per share from continuing operations
$
0.29

 
$
(0.87
)
 
$
0.23

 
$
(0.90
)
Loss per share from discontinued operations, net of income taxes
—

 
(0.01
)
 
—

 
(0.01
)
Net income (loss) per share
$
0.29

 
$
(0.88
)
 
$
0.23

 
$
(0.91
)
Diluted
 
 
 
 
 
 
 
Income (loss) per share from continuing operations
$
0.26

 
$
(0.87
)
 
$
0.22

 
$
(0.90
)
Loss per share from discontinued operations, net of income taxes
—

 
(0.01
)
 
—

 
(0.01
)
Net income (loss) per share
$
0.26

 
$
(0.88
)
 
$
0.22

 
$
(0.91
)
Schedule of Potentially Dilutive Securities Excluded from Computation
The following table sets forth the potentially dilutive securities excluded from the computation because their effect would have been anti-dilutive: 
 
Three months ended May 31,
 
Six months ended May 31,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
4 1/16% Debentures
—

 
19.7

 
—

 
20.4

Employee stock options and stock purchase plan
—

 
0.7

 
—

 
0.7

Unvested restricted shares
—

 
1.5

 
—

 
1.5

Total potentially dilutive securities
—

 
21.9

 
—

 
22.6