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Earnings Per Share Basic and Diluted Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Our calculations for basic and dilutive earnings per share for the three and six months ended June 30, 2016 and 2015 are as follows:

 
Three Months
 
Six Months
(dollars in millions, except per share data, shares and stock units in thousands)
2016
 
2015
 
2016
 
2015
Basic and dilutive net income available to common shareholders
$
27.1

 
$
26.0

 
$
15.1

 
$
4.4

 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
32,459

 
31,929

 
32,362

 
31,367

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested shares and stock units
395

 
653

 
452

 
711

Series B Notes
—

 
—

 
—

 
484

Dilutive weighted average shares outstanding
32,854

 
32,582

 
32,814

 
32,562

 
 
 
 
 
 
 
 
Basic earnings per share(a)
$
0.84

 
$
0.81

 
$
0.47

 
$
0.14

Diluted earnings per share(a)
$
0.83

 
$
0.80

 
$
0.46

 
$
0.13

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