Long-term Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Compensation Expense

For 2019, 2018 and 2017, compensation expense associated with the Company's long-term compensation plans was as follows:

	Year Ended December 31,
(dollars in millions)	2019		2018		2017
Equity classified RSUs	$	12.6	$	13.9	$	8.3
Liability classified RSUs	(1.0)		0.7		0.6
Stock options	0.2		0.8		0.7
Compensation expense from continuing operations	11.8		15.4		9.6
Compensation expense from discontinued operations	0.6		3.9		2.2
Total	$	12.4	$	19.3	$	11.8
Unrecognized compensation expense for awards expected to vest	$	8.9
Weighted average remaining vesting period (months)	25

Restricted Stock Unit Award Activity in Payment Awards

At December 31, 2019, a total of 3,453,247 shares of common stock had been issued, and 4,833,766 RSUs and stock options were outstanding under the 2013 Plan.

	Total	RSUs		Stock Options
		Equity Classified	Liability Classified
Outstanding at December 31, 2018	3,890,643	3,034,193	319,678	536,772
Granted	3,634,086	3,404,362	—	229,724
Exercised/Issued	(1,968,471)	(1,723,373)	—	(245,098)
Cancelled	(66,117)	—	—	(66,117)
Forfeited	(656,375)	(525,522)	(24,581)	(106,272)
Outstanding at December 31, 2019	4,833,766	4,189,660	295,097	349,009

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)
2019	3,404,362	$	11.14	44
2018	1,581,444	$	10.35	26
2017	1,117,719	$	16.08	31

Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions

The following table provides the range of assumptions used in valuing RSUs containing market vesting conditions for the year ended December 31, 2017, as there were no RSUs containing market vesting conditions granted in 2019 and 2018:

	2017
Weighted average expected term (years) (1)	3.00
Expected volatility (2)	52.1%
Risk-free rate (3)	1.50%

⁽¹⁾ Weighted average expected term is calculated based on the award vesting period.

⁽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 three years at the date of grant.

Schedule of RSUs Outstanding

At December 31, 2019, the following equity classified RSUs were outstanding:

	December 31, 2019
Vesting Conditions:	Outstanding	Weighted Average Remaining Vesting Period (months)	Potential Additional Awards
Service-based	471,319	9	—
Performance-based	3,564,350	30	684,071
Market-based	153,991	4	307,982
Total	4,189,660	27	992,053

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

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
2019	229,724	$	11.28	$	5.15
2017	256,202	$	13.30	$	6.05

Valuation Assumptions for Option Grants

The following table provides the range of assumptions used in valuing stock options for the years ended December 31, 2019 and 2017, as there were no stock options granted in 2018:

	Year Ended December 31,
	2019	2017
Weighted average expected term (years) (1)	6.0	6.0
Expected volatility (2)	44.2%	45.0%
Risk-free rate (3)	2.48%	2.09%
Expected dividend rate	—%	—%

⁽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.