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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share-based compensation expense Share-based compensation expense and cash flow amounts were as follows:
 
Successor
 
Year Ended December 31, 2019
 
Year Ended December 31, 2018
 
April 2 through December 31, 2017
 
(Dollars in millions)
Share-based compensation expense
$
38.3

 
$
34.9

 
$
21.8

Tax benefit
—

 
—

 
—

Share-based compensation expense, net of tax benefit
$
38.3

 
$
34.9

 
$
21.8

 
 
 
 
 
 
Cash received upon the exercise of stock options
—

 
—

 
—

Write-off tax benefits related to share-based compensation
—

 
—

 
—
Schedule of Share-based Compensation, Restricted Stock Units Activity
A summary of restricted stock unit activity is as follows:
 
Year Ended December 31, 2019
 
Weighted
Average
Grant-Date
Fair Value
Nonvested at December 31, 2018
2,641,087

 
$
24.87

Granted
664,899

 
29.75

Vested
(1,401,268
)
 
23.40

Forfeited
(198,693
)
 
30.96

Nonvested at December 31, 2019
1,706,025

 
$
26.89
Schedule Of Share Based Compensation Performance unit Activity Table Text Block
A summary of performance unit activity is as follows:
 
Year Ended December 31, 2019
 
Weighted
Average
Remaining Contractual Life
Nonvested at December 31, 2018
206,630

 
2.0

Granted
264,918

 
 
Vested
—

 
 
Forfeited
(44,942
)
 
 
Nonvested at December 31, 2019
426,606

 
1.6
Schedule Of Share Based Payment Award Stock Options Valuation Grants Assumptions Table Text Block The assumptions used in the valuations for grants were as follows:
 
Year Ended December 31,
 
2019
 
2018
Risk-free interest rate
2.44
%
 
2.24
%
Expected volatility
48.81
%
 
57.75
%
Dividend yield
—
%
 
—
%
Share-based Compensation Expense and Cash Flow Amounts [Table Text Block] Share-based compensation expense and cash flow amounts were as follows:
 
Predecessor
 
January 1 through April 1, 2017
 
(Dollars in millions)
Share-based compensation expense - equity classified awards
$
1.9

Tax benefit
—

Share-based compensation expense, net of tax benefit
$
1.9

 
 
Cash received upon the exercise of stock options and from employee stock purchases
—

Write-off tax benefits related to share-based compensation
—