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Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Our calculations for basic and dilutive earnings per share for the three and nine months ended September 30, 2018 and 2017 are as follows:
 
Three Months
 
Nine Months
(dollars in millions, except per share data; shares and stock units in thousands)
2018
 
2017
 
2018
 
2017
Basic and dilutive net income (loss) available to common shareholders
$
2.9

 
$
3.0

 
$
2.7

 
$
(3.3
)
 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
33,051

 
32,723

 
32,827

 
32,550

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested shares and stock units
944

 
869

 
928

 
—

Dilutive weighted average shares outstanding
33,995

 
33,592

 
33,755

 
32,550

 
 
 
 
 
 
 
 
Basic earnings (loss) per share(a)
$
0.09

 
$
0.09

 
$
0.08

 
$
(0.10
)
Diluted earnings (loss) per share(a)
$
0.09

 
$
0.09

 
$
0.08

 
$
(0.10
)
(a)
Earnings (loss) per share is based on unrounded figures and not the rounded figures presented.