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Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017 are as follows:
 
Three Months
 
Six 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
$
14.4

 
$
19.0

 
$
(0.2
)
 
$
(6.3
)
 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
32,966

 
32,715

 
32,894

 
32,642

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested shares and stock units
828

 
607

 
—

 
—

Dilutive weighted average shares outstanding
33,794

 
33,322

 
32,894

 
32,642

 
 
 
 
 
 
 
 
Basic earnings (loss) per share(a)
$
0.44

 
$
0.58

 
$
0.00

 
$
(0.19
)
Diluted earnings (loss) per share(a)
$
0.43

 
$
0.57

 
$
0.00

 
$
(0.19
)
(a)
Earnings (loss) per share is based on unrounded figures and not the rounded figures presented.