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Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Our calculations for basic and dilutive earnings (loss) per share for three and six months ended June 30, 2019 and 2018 are as follows:
 
Three Months
 
Six Months
(dollars in millions, except per share data; shares and stock units in thousands)
2019
 
2018
 
2019
 
2018
Basic and dilutive net income (loss) available to common shareholders
$
(23.6
)
 
$
14.4

 
$
(72.7
)
 
$
(0.2
)
 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
33,247

 
32,966

 
33,199

 
32,894

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested shares and stock units(a)
—

 
828

 
—

 
—

Dilutive weighted average shares outstanding
33,247

 
33,794

 
33,199

 
32,894

 
 
 
 
 
 
 
 
Basic earnings (loss) per share(b)
$
(0.71
)
 
$
0.44

 
$
(2.19
)
 
$
0.00

Diluted earnings (loss) per share(b)
$
(0.71
)
 
$
0.43

 
$
(2.19
)
 
$
0.00

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