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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2016
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) available to common shareholders 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, 2016, 2015, and 2014 are as follows:
    
(dollars in millions, except per share data, shares and stock units in thousands)
 
2016
 
2015
 
2014
Basic and dilutive net income (loss) available to common shareholders
 
$
21.5

 
$
0.7

 
$
(85.8
)
 
 
 
 
 
 
 
Basic weighted average shares outstanding
 
32,416

 
31,736

 
28,592

Effect of dilutive securities:
 
 
 
 
 
 
Unvested shares and stock units(b)
 
624

 
616

 
—

Series B Notes
 
—

 
240

 
—

Dilutive weighted average shares outstanding
 
33,040

 
32,592

 
28,592

 
 
 
 
 
 
 
Basic earnings (loss) per share(a)
 
$
0.66

 
$
0.02

 
$
(3.00
)
Diluted earnings (loss) per share(a)
 
$
0.65

 
$
0.02

 
$
(3.00
)
(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 year ended December 31, 2014, 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)
2016
2015
2014
Anti-dilutive unvested shares, options, and stock units(a)
196

71

1,072

Anti-dilutive Series B Notes
—

—

982


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