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Earnings Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
A computation of loss per share and weighted average shares of common stock outstanding for the years ended December 31, 2016, 2015 and 2014 follows:
 
 
Year Ended December 31,
 (amounts in millions, except per share amounts)
 
2016
 
2015
 
2014
Net loss attributable to common stockholders
 
$
(40.8
)
 
$
(308.6
)
 
$
(262.6
)
Adjustments to the numerator for diluted earnings 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 attributed to PDH non-controlling interest
 
(5.9
)
 
—

 
—

Net loss attributable to common stockholders for diluted EPS
 
$
(177.6
)
 
$
(308.6
)
 
$
(262.6
)
 
 
 
 
 
 
 
Basic weighted average common stock outstanding
 
243.3

 
203.2

 
135.3

Conversion related to the amendment of the Series B 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 (1)
 
29.0

 
—

 
—

Dilutive weighted average common stock outstanding
 
272.3

 
203.2

 
135.3

Loss per share attributable to common stockholders:
 
  

 
  

 
  

Basic
 
$
(0.17
)
 
$
(1.52
)
 
$
(1.94
)
Diluted
 
$
(0.65
)
 
$
(1.52
)
 
$
(1.94
)
 
 
 
 
 
 
 
Dividends per share paid to common stockholders
 
$
—

 
$
—

 
$
—

(1) For the years ended December 31, 2015, and 2014, no share adjustments were included in the dilutive weighted average shares outstanding computation as their effect would have been anti-dilutive. For more information about such dilutive shares outstanding, refer to the table below.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
For the years ended December 31, 2016, 2015, and 2014, 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 thousands)
 
2016
 
2015
 
2014
Shares contingently issuable to Founder Entities as stock dividend to Series A Preferred Stock
 
—

 
1,239

 
10,453

Shares issuable upon conversion of PDH Common Stock
 
—

 
8,318

 
8,641

Shares issuable upon conversion of Series A Preferred Stock
 
2,000

 
2,000

 
2,000

Shares issuable upon conversion of Series B Convertible Preferred Stock
 
—

 
19,443

 
—

Shares contingently issuable for the contingent consideration
 
8,553

 
4,640

 
1,503

Shares issuable upon conversion of the 401k exchange rights
 
—

 
—

 
270

Stock options
 
—

 
55

 
89

RSUs
 
147

 
74

 
70

Shares issuable under the ESPP
 
2

 
1

 
—

 
 
10,702

 
35,770

 
23,026