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Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Earnings per share
A computation of earnings (loss) per share from continuing operations and weighted average shares of the Company's common stock outstanding for the three and six months ended June 30, 2019 and 2018 is as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 (dollars in millions, except per share amounts)
2019
 
2018
 
2019
 
2018
Net income (loss) from continuing operations
$
14.7

 
$
(49.6
)
 
$
11.2

 
$
(58.5
)
Net loss (income) attributable to the non-controlling interests
—

 
0.6

 
(0.6
)
 
(0.7
)
Net income (loss) from continuing operations attributable to common stockholders
$
14.7

 
$
(49.0
)
 
$
10.6

 
$
(59.2
)
 
 
 
 
 
 
 
 
Basic weighted average common shares outstanding
257.3

 
288.2

 
262.7

 
288.0

Denominator adjustments for diluted EPS:
 
 
 
 
 
 
 
Number of shares issuable upon conversion of founder preferred stock
2.0

 
—

 
2.0

 
—

Number of stock options, RSUs and shares issued through ESPP
0.3

 
—

 
0.6

 
—

Denominator adjustments for diluted EPS
2.3

 
—

 
2.6

 
—

Diluted weighted average common shares outstanding
259.6

 
288.2

 
265.3

 
288.0

 
 
 
 
 
 
 
 
Earnings (loss) per share from continuing operations attributable to common stockholders:
 

 
 

 
 

 
 

Basic
$
0.06

 
$
(0.17
)
 
$
0.04

 
$
(0.21
)
Diluted
$
0.06

 
$
(0.17
)
 
$
0.04

 
$
(0.21
)
Summary of securities excluded from computation of earnings per share
For the three and six months ended June 30, 2019 and 2018, the following securities were not included in the computation of diluted shares outstanding because the effect would be anti-dilutive or because performance targets were not yet achieved for RSUs contingent upon performance:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 (shares in millions)
2019
 
2018
 
2019
 
2018
Shares issuable for the contingent consideration
5.0

 
7.4

 
5.1

 
8.0

Shares issuable upon conversion of Series A Preferred Stock
—

 
2.0

 
—

 
2.0

Shares issuable upon vesting of RSUs
0.6

 
1.5

 
0.5

 
1.3

Shares issuable upon conversion of the shares of common stock of PDH
—

 
4.1

 
—

 
4.2

 Total
5.6

 
15.0

 
5.6

 
15.5