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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share:
 
Year ended December 31,
Dollar and share amounts in millions, except per share amounts
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net income (loss):
 
 
 
 
 
Income (loss) from continuing operations
$
150.3

 
$
(86.0
)
 
$
(73.4
)
Loss from discontinued operations
(0.5
)
 
(2.1
)
 
(2.0
)
Net income (loss)
$
149.8

 
$
(88.1
)
 
$
(75.4
)
Denominator:
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
Weighted average common shares outstanding
143.4

 
142.4

 
141.1

Effect of dilutive securities:
 
 
 
 
 
Dilutive effect of employee stock plans
1.7

 
—

 
—

Dilutive effect of stock warrants
0.2

 
—

 
—

Dilutive potential common shares
1.9

 
—

 
—

Denominator for diluted earnings per share:
 
 
 
 
 
Adjusted weighted average shares
145.3

 
142.4

 
141.1

Basic earnings per share:
 
 
 
 
 
Income (loss) from continuing operations
$
1.05

 
$
(0.60
)
 
$
(0.52
)
Loss from discontinued operations
(0.01
)
 
(0.02
)
 
(0.01
)
Net income (loss) per share
$
1.04

 
$
(0.62
)
 
$
(0.53
)
Diluted earnings per share:
 
 
 
 
 
Income (loss) from continuing operations
$
1.03

 
$
(0.60
)
 
$
(0.52
)
Loss from discontinued operations
—

 
(0.02
)
 
(0.01
)
Net income (loss) per share
$
1.03

 
$
(0.62
)
 
$
(0.53
)