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Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted A computation of weighted average shares of common stock outstanding and loss per share for 2018, 2017 and 2016 follows:
 
 
Year Ended December 31,
 ($ amounts in millions, except per share amounts)
 
2018
 
2017
 
2016
Net loss from continuing operations
 
$
(77.0
)
 
$
(191.8
)
 
$
(190.5
)
Net (income) loss attributable to the non-controlling interests
 
(1.5
)
 
(2.3
)
 
5.6

Gain on amendment of Series B Convertible Preferred Stock
 
—

 
—

 
32.9

Net loss from continuing operations attributable to common stockholders
 
(78.5
)
 
(194.1
)
 
(152.0
)
Numerator adjustments for diluted loss per share:
 
 
 
 
 
 
Gain on settlement agreement related to Series B Convertible Preferred Stock
 
—

 
—

 
(103.0
)
Gain on amendment of Series B Convertible Preferred Stock
 
—

 
—

 
(32.9
)
Remeasurement adjustment associated with the Preferred Series B redemption liability
 
—

 
—

 
5.0

Loss allocated to PDH non-controlling interest
 
—

 
—

 
(5.9
)
Net loss from continuing operations attributable to common stockholders for diluted EPS
 
$
(78.5
)
 
$
(194.1
)
 
$
(288.8
)
 
 
 
 
 
 
 
Basic weighted average common stock outstanding
 
288.2

 
286.1

 
243.3

Denominator adjustments for diluted loss per share:
 
 
 
 
 
 
Conversion related to the amendment of the Series B Convertible Preferred Stock - assumed at beginning of reporting period
 
—

 
—

 
15.3

Settlement of preferred stock redemption liability - assumed at beginning of reporting period
 
—

 
—

 
5.7

Conversion of PDH non-controlling interest
 
—

 
—

 
8.0

Share adjustments
 
—

 
—

 
29.0

Dilutive weighted average common stock outstanding
 
288.2

 
286.1

 
272.3

 
 
 
 
 
 
 
Loss per share from continuing operations attributable to common stockholders:
 
  

 
  

 
  

Basic
 
$
(0.27
)
 
$
(0.68
)
 
$
(0.62
)
Diluted
 
$
(0.27
)
 
$
(0.68
)
 
$
(1.06
)
 
 
 
 
 
 
 
Dividends per share paid to common stockholders
 
$
—

 
$
—

 
$
—
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share For 2018, 2017 and 2016, the following securities were not included in the computation of diluted shares outstanding because the effect would be anti-dilutive, or because performance targets and/or market conditions were not yet met for awards contingent upon such measures:
 
 
Year Ended December 31,
 (amounts in millions)
 
2018
 
2017
 
2016
Shares issuable for the contingent consideration
 
7.8

 
7.4

 
8.6

Shares issuable upon conversion of PDH Common Stock
 
4.1

 
6.0

 
—

Shares issuable upon conversion of Series A Preferred Stock
 
2.0

 
2.0

 
2.0

Shares issuable upon vesting of RSUs
 
1.6

 
0.8

 
0.1

Shares issuable upon vesting and exercise of stock options
 
0.1

 
0.1

 
—

 Total shares excluded
 
15.6

 
16.3

 
10.7