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(Loss) Income Per Share of Common Stock
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
(Loss) Income Per Share of Common Stock
(Loss) Income Per Share of Common Stock
A reconciliation of the numerator and denominator used to calculate basic and diluted (loss) income per share of common stock ("EPS"):
 
Year Ended
 
One month ended
 
December 31,
 
December 31,
 
November 30,
 
December 31,
 
2017
 
2016
 
2015
 
2015
 
(In millions, except per share amounts)
Numerator:
 
 
 
 
 
 
 
Net (loss) income
$
(9.2
)
 
$
18.0

 
$
(16.2
)
 
$
7.0

Income allocated to participating securities
—

 
(0.4
)
 
—

 
(0.2
)
Net (loss) income for basic EPS
(9.2
)
 
17.6

 
(16.2
)
 
6.8

Interest on 4 1/16% Debentures
—

 
—

 
—

 
0.3

Net (loss) income for diluted EPS
$
(9.2
)
 
$
17.6

 
$
(16.2
)
 
$
7.1

Denominator:
 
 
 
 
 
 
 
Basic weighted average shares
73.0

 
65.6

 
61.1

 
62.9

Effect of:
 
 
 
 
 
 
 
4 1/16% Debentures
—

 
—

 
—

 
9.4

  Employee stock options and stock purchase plan
—

 
0.1

 
—

 
0.2

Diluted weighted average shares
73.0

 
65.7

 
61.1

 
72.5

Basic:
 
 
 
 
 
 
 
Net (loss) income per share
$
(0.13
)
 
$
0.27

 
$
(0.27
)
 
$
0.11

Diluted:
 
 
 
 
 
 
 
Net (loss) income per share
$
(0.13
)
 
$
0.27

 
$
(0.27
)
 
$
0.10


The following table sets forth the potentially dilutive securities excluded from the computation because their effect would have been anti-dilutive: 
 
Year Ended
 
One month ended
 
December 31,
 
December 31,
 
November 30,
 
December 31,
 
2017
 
2016
 
2015
 
2015
 
(In millions)
4 1/16% Debentures
0.1

 
7.1

 
11.0

 
—

Employee stock options and stock purchase plan
0.1

 
—

 
0.2

 
—

Unvested restricted shares
1.6

 
1.6

 
1.6

 
1.3

Total potentially dilutive securities
1.8

 
8.7

 
12.8

 
1.3



The Company's 2 1/4% Notes were not included in the computation of diluted EPS for fiscal 2017 and 2016 because the average market price of the common stock did not exceed the conversion price and the Company only expects the conversion premium for the 2 1/4% Notes to be settled in common shares.