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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings (Loss) Per Share
Earnings (Loss) Per Share

We calculate basic earnings (loss) per share by dividing our net earnings (loss) by our weighted-average shares outstanding at the end of the period. The calculation for diluted earnings per share adjusts the weighted average shares outstanding for our dilutive unvested shares and stock units using the treasury stock method and for our convertible notes using the if-converted method. Our calculations for basic and dilutive earnings (loss) per share for the years ended December 31, 2015, 2014, and 2013 are as follows:
    
(dollars in millions, except per share data, shares and stock units in thousands)
 
2015
 
2014
 
2013
Basic and dilutive net income (loss) available to common shareholders
 
$
0.7

 
$
(85.8
)
 
$
(83.6
)
 
 
 
 
 
 
 
Basic weighted average shares outstanding
 
31,736

 
28,592

 
9,332

Effect of dilutive securities:
 
 
 
 
 
 
Unvested shares and stock units(b)
 
616

 
—

 
—

Series B Notes
 
240

 
—

 
—

Dilutive weighted average shares outstanding
 
32,592

 
28,592

 
9,332

 
 
 
 
 
 
 
Basic earnings (loss) per share(a)
 
$
0.02

 
$
(3.00
)
 
$
(8.96
)
Diluted earnings (loss) per share(a)
 
$
0.02

 
$
(3.00
)
 
$
(8.96
)
(a) Earnings (loss) per share is based on unrounded figures and not the rounded figures presented.
(b) Includes unvested shares of Common Stock, unvested stock units, and vested stock units for which the underlying Common Stock has not been distributed.

Given our net loss position for the years ended December 31, 2014 and 2013, there are no dilutive securities for these periods.

Our anti-dilutive securities for the years ended December 31 are as follows:

(shares and stock units in thousands)
2015
2014
2013
Anti-dilutive unvested shares, options, and stock units(a)
71

1,072

691

Anti-dilutive 6% Notes
—

—

18

Anti-dilutive Series A Notes
—

—

5,226

Anti-dilutive Series B Notes
—

982

4,219


(a) Includes unvested shares of Common Stock, unvested stock units, and vested stock units for which the underlying Common Stock has not been distributed.