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Earnings (Loss) Per Share
 6 Months Ended
Jun. 30, 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 shares, options and stock units using the treasury stock method. Our calculation for basic and dilutive earnings per share for the three and six months ended June 30, 2015 and 2014 is as follows:

 
Three Months
 
Six Months
(dollars in millions, except per share data, shares and stock units in thousands)
2015
 
2014
 
2015
 
2014
Basic and dilutive net income (loss) available to common shareholders
$
26.0

 
$
(4.9
)
 
$
4.4

 
$
(93.2
)
 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
31,929

 
30,612

 
31,367

 
26,501

Effect of dilutive securities:
 
 
 
 
 
 
 
Shares and stock units
653

 
—

 
711

 
—

Series B Notes
—

 
—

 
484

 
—

Dilutive weighted average shares outstanding
32,582

 
30,612

 
32,562

 
26,501

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
0.81

 
$
(0.16
)
 
$
0.14

 
$
(3.52
)
Diluted earnings (loss) per share
$
0.80

 
$
(0.16
)
 
$
0.13

 
$
(3.52
)

Given our net loss position for the three and six months ended June 30, 2014, there were no dilutive securities for these periods.

Our anti-dilutive securities at June 30, 2015 and 2014 are as follows:
(shares, options and stock units in thousands)
2015
2014
Anti-dilutive shares, options, and stock units
237

671

Anti-dilutive 10% Series A Convertible Senior Secured Notes (“Series A Notes”)
—

2,612

Anti-dilutive Series B Notes
—

981