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Long-term Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of compensation expense
For 2020, 2019 and 2018, compensation expense associated with the Company's long-term compensation plans was as follows:
Year Ended December 31,
  (dollars in millions)
202020192018
Equity classified RSUs$4.2 $12.6 $13.9 
Liability classified RSUs0.9 (1.0)0.7 
Stock options0.9 0.2 0.8 
Compensation expense from continuing operations6.0 11.8 15.4 
Compensation expense from discontinued operations— 0.6 3.9 
Total
$6.0 $12.4 $19.3 
Unrecognized compensation expense for awards expected to vest$9.5 
Weighted average remaining vesting period (months)18
Restricted stock unit award activity in payment awards
At December 31, 2020, a total of 4,238,736 shares of common stock had been issued, and 4,939,688 RSUs and stock options were outstanding under the 2013 Plan.
TotalRSUsStock Options
Equity
Classified
Liability
Classified
Outstanding at December 31, 20194,833,766 4,189,660 295,097 349,009 
Granted1,743,117 1,500,783 — 242,334 
Exercised/Issued (785,489)(647,238)(118,039)(20,212)
Cancelled(123,982)(118,471)— (5,511)
Forfeited(727,724)(727,724)— — 
Outstanding at December 31, 20204,939,688 4,197,010 177,058 565,620 
Issuance of restricted stock units
The Company granted the following equity classified RSUs under the 2013 Plan:
Year of Issuance:RSUsWeighted Average Grant Date Fair ValueWeighted Average Vesting Period (months)
20201,500,783 $11.45 32
20193,404,362 $11.14 44
20181,581,444 $10.35 26
Schedule of RSUs outstanding
At December 31, 2020, the following equity classified RSUs were outstanding:
December 31, 2020
Vesting Conditions:OutstandingWeighted Average Remaining Vesting Period (months)Potential Additional Awards
Service-based451,499 13— 
Performance-based3,745,511 201,049,727 
Total4,197,010 201,049,727 
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 OptionsWeighted Average Strike Price Per ShareWeighted Average Grant Date Fair Value Per Share
2020242,334 $12.25 $4.47 
2019229,724 $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, as there were no stock options granted in 2018:
Year Ended December 31,
20202019
Weighted average expected term (years) (1)
6.06.0
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.