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Earnings (Loss) Per Share Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Our calculations for basic and dilutive earnings (loss) per share for the years ended December 31, 2016, 2015, and 2014 are as follows:
    
(dollars in millions, except per share data, shares and stock units in thousands)
 
2016
 
2015
 
2014
Basic and dilutive net income (loss) available to common shareholders
 
$
21.5

 
$
0.7

 
$
(85.8
)
 
 
 
 
 
 
 
Basic weighted average shares outstanding
 
32,416

 
31,736

 
28,592

Effect of dilutive securities:
 
 
 
 
 
 
Unvested shares and stock units(b)
 
624

 
616

 
—

Series B Notes
 
—

 
240

 
—

Dilutive weighted average shares outstanding
 
33,040

 
32,592

 
28,592

 
 
 
 
 
 
 
Basic earnings (loss) per share(a)
 
$
0.66

 
$
0.02

 
$
(3.00
)
Diluted earnings (loss) per share(a)
 
$
0.65

 
$
0.02

 
$
(3.00
)
(a) Earnings (loss) per share is based on unrounded figures and not the rounded figures presented.
Schedule of Antidilutive Securities
Our anti-dilutive securities for the years ended December 31 are as follows:

(shares and stock units in thousands)
2016
2015
2014
Anti-dilutive unvested shares, options, and stock units(a)
196

71

1,072

Anti-dilutive Series B Notes
—

—

982