Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Share-based compensation expense and cash flow amounts were as follows:



	Successor
	Year Ended December 31, 2018		April 2 through December 31, 2017
	(Dollars in millions)
Share-based compensation expense	$	34.9	$	21.8
Tax benefit	—		—
Share-based compensation expense, net of tax benefit	$	34.9	$	21.8

Cash received upon the exercise of stock options and from employee stock purchases	—		—
Write-off tax benefits related to share-based compensation	—		—

A summary of restricted stock unit activity is as follows:



	Year Ended December 31, 2018		Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2017	3,513,953		$	22.04
Granted	476,815		38.19
Vested	(1,218,644	)	22.20
Forfeited	(131,037	)	23.82
Nonvested at December 31, 2018	2,641,087		$	24.87

A summary of performance unit activity is as follows:



	Year Ended December 31, 2018	Weighted Average Remaining Contractual Life
Nonvested at December 31, 2017	—	—
Granted	206,630
Forfeited	—
Vested	—
Nonvested at December 31, 2018	206,630	2.0

The assumptions used in the valuations for grants were as follows:

Share-based compensation expense and cash flow amounts were as follows:



	Predecessor
	January 1 through April 1, 2017		Year Ended December 31, 2016
	(Dollars in millions)
Share-based compensation expense - equity classified awards	$	1.9	$	11.3
Share-based compensation expense - liability classified awards	—		1.5
Total share-based compensation expense	1.9		12.8
Tax benefit	—		—
Share-based compensation expense, net of tax benefit	$	1.9	$	12.8

Cash received upon the exercise of stock options and from employee stock purchases	—		—
Write-off tax benefits related to share-based compensation	—		—