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Earnings Per Share Earnings Per Share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2016 and 2015 are as follows:

 
Three Months
 
Nine 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
$
13.9

 
$
19.8

 
$
29.0

 
$
24.2

 
 
 
 
 
 
 
 
Basic weighted average shares outstanding
32,466

 
32,065

 
32,398

 
31,602

Effect of dilutive securities:
 
 
 
 
 
 
 
Unvested shares and stock units
728

 
556

 
517

 
646

Series B Notes
—

 
—

 
—

 
321

Dilutive weighted average shares outstanding
33,194

 
32,621

 
32,915

 
32,569

 
 
 
 
 
 
 
 
Basic earnings per share(a)
$
0.43

 
$
0.62

 
$
0.89

 
$
0.76

Diluted earnings per share(a)
$
0.42

 
$
0.61

 
$
0.88

 
$
0.74

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