Long-term Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of compensation expense

For 2021, 2020 and 2019, compensation expense associated with the Company's long-term compensation plans was as follows:

	Year Ended December 31,
(dollars in millions)	2021		2020		2019
Equity classified RSUs	$	39.6	$	4.2	$	12.6
Liability classified RSUs	—		0.9		(1.0)
Stock options	0.5		0.9		0.2
Compensation expense from continuing operations	40.1		6.0		11.8
Compensation expense from discontinued operations	—		—		0.6
Total	$	40.1	$	6.0	$	12.4
Unrecognized compensation expense for awards expected to vest	$	22.1
Weighted average remaining vesting period (months)	7

Restricted stock unit award activity in payment awards

At December 31, 2021, a total of 4,774,051 shares of common stock had been issued, and 4,589,005 RSUs and stock options were outstanding under the 2013 Plan.

	Total	RSUs		Stock Options
		Equity Classified	Liability Classified
Outstanding at December 31, 2020	4,939,688	4,197,010	177,058	565,620
Granted	852,890	852,890	—	—
Exercised/Issued	(535,315)	(363,268)	—	(172,047)
Cancelled	(616,280)	(439,222)	(177,058)	—
Forfeited	(51,978)	(51,978)	—	—
Outstanding at December 31, 2021	4,589,005	4,195,432	—	393,573

Issuance of restricted stock units

The Company granted the following equity classified RSUs under the 2013 Plan:

Year of Issuance:	RSUs	Weighted Average Grant Date Fair Value		Weighted Average Vesting Period (months)
2021	852,890	$	18.02	28
2020	1,500,783	$	11.45	32
2019	3,404,362	$	11.14	44

Schedule of RSUs outstanding

At December 31, 2021, the following equity classified RSUs were outstanding:

	December 31, 2021
Vesting Conditions:	Outstanding	Weighted Average Remaining Vesting Period (months)	Potential Additional Awards
Service-based	559,220	12.2	—
Performance-based	1,372,574	14.7	880,698
Performance-based awards previously deemed not probable	2,263,638	1.6	—
Total	4,195,432	7.3	880,698

Schedule of qualified and non-qualified stock options

The Company granted the following qualified and non-qualified stock options under the 2013 Plan:

Year of Issuance:	Stock Options	Weighted Average Strike Price Per Share		Weighted Average Grant Date Fair Value Per Share
2020	242,334	$	12.25	$	4.47
2019	229,724	$	11.28	$	5.15

Schedule of range of assumptions used in valuing stock options

The following table provides the range of assumptions used in valuing stock options for the years ended December 31, 2020 and 2019:

	Year Ended December 31,
	2020	2019
Weighted average expected term (years) (1)	6.0	6.0
Expected volatility (2)	35.5%	44.2%
Risk-free rate (3)	1.45%	2.48%
Expected dividend yield	—%	—%

(1) Weighted average expected term is calculated based on the simplified method for plain vanilla options.

(2) Expected volatility is calculated based on a blend of the implied and historical equity volatility of an index of comparable companies over a period equal to the expected term.

(3) Risk-free rate of return is based on an interpolation of U.S. Treasury rates to reflect an expected term of six years at the date of grant.