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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract]  
Summary Of Common Stock Activity [Table Text Block]
The following table summarizes Common Stock activity from April 2, 2017 to December 31, 2017:
 
Successor
 
April 2 through December 31, 2017
 
(In millions)
Shares outstanding at the beginning of the period
70.9

Shares issued for preferred share conversions
33.8

Shares issued for warrant conversions
6.2

Shares issued for vested restricted stock units
0.1

Shares repurchased
(5.8
)
Shares outstanding at the end of the period
105.2
Summary of Preferred Stock Activity [Table Text Block]
The following table summarizes the Series A Convertible Preferred Stock activity from April 2, 2017 to December 31, 2017:
 
Successor
 
April 2 through December 31, 2017
 
(In millions)
Shares outstanding at the beginning of the period
30.0

Shares converted to Common Stock
(17.2
)
Shares issued for payable in-kind preferred stock dividends
0.7

Shares outstanding at the end of the period
13.5