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Earnings Per Share
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

We calculate basic earnings per share by dividing our net earnings 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. Our calculations for basic and dilutive earnings per share for the three and six months ended June 30, 2017 and 2016 are as follows:

 
Three Months
 
Six Months
(dollars in millions, except per share data, shares and stock units in thousands)
2017
 
2016
 
2017
 
2016
Basic and dilutive net income (loss) available to common shareholders
$
19.0

 
$
27.1

 
$
(6.3
)
 
$
15.1

 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
32,715

 
32,459

 
32,642

 
32,362

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested shares and stock units
607

 
395

 
—

 
452

Dilutive weighted average shares outstanding
33,322

 
32,854

 
32,642

 
32,814

 
 
 
 
 
 
 
 
Basic earnings per share(a)
$
0.58

 
$
0.84

 
$
(0.19
)
 
$
0.47

Diluted earnings per share(a)
$
0.57

 
$
0.83

 
$
(0.19
)
 
$
0.46

(a)
Earnings per share is based on unrounded figures and not the rounded figures presented.

At June 30, 2017 and 2016, our anti-dilutive unvested shares, options, and stock units were approximately 350,000 and 497,000, respectively.