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Earnings (Loss) Per Share Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014, and 2013 are as follows:
    
(dollars in millions, except per share data, shares and stock units in thousands)
 
2015
 
2014
 
2013
Basic and dilutive net income (loss) available to common shareholders
 
$
0.7

 
$
(85.8
)
 
$
(83.6
)
 
 
 
 
 
 
 
Basic weighted average shares outstanding
 
31,736

 
28,592

 
9,332

Effect of dilutive securities:
 
 
 
 
 
 
Unvested shares and stock units(b)
 
616

 
—

 
—

Series B Notes
 
240

 
—

 
—

Dilutive weighted average shares outstanding
 
32,592

 
28,592

 
9,332

 
 
 
 
 
 
 
Basic earnings (loss) per share(a)
 
$
0.02

 
$
(3.00
)
 
$
(8.96
)
Diluted earnings (loss) per share(a)
 
$
0.02

 
$
(3.00
)
 
$
(8.96
)
(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)
2015
2014
2013
Anti-dilutive unvested shares, options, and stock units(a)
71

1,072

691

Anti-dilutive 6% Notes
—

—

18

Anti-dilutive Series A Notes
—

—

5,226

Anti-dilutive Series B Notes
—

982

4,219