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Long-term Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Expense For 2018, 2017 and 2016, compensation expense associated with the Company's long-term compensation plans was as follows:
 
 
Year Ended December 31,
  ($ amounts in millions)
 
2018
 
2017
 
2016
Equity classified RSUs
 
$
13.9

 
$
8.3

 
$
5.4

Liability classified RSUs
 
0.7

 
0.6

 
0.4

Stock options
 
0.8

 
0.7

 
0.4

Compensation expense from continuing operations
 
15.4

 
9.6

 
6.2

Compensation expense from discontinued operations
 
3.9

 
2.2

 
1.1

Total
 
$
19.3

 
$
11.8

 
$
7.3

 
 
 
 
 
 
 
Unrecognized compensation expense for awards expected to vest
 
 
 
 
 
 
Continuing operations
 
14.7

 
 
 
 
Discontinued operations
 
3.6

 
 
 
 
Weighted average remaining vesting period (months)
 
13

 
 
 
 
Restricted Stock Unit Award Activity in Payment Awards At December 31, 2018, a total of 1,484,776 shares of common stock had been issued, and 3,890,643 RSUs and stock options were outstanding under the 2013 Plan.
 
 
Total
 
RSUs
 
Stock Options (1)
 
 
Equity
Classified
 
Liability
Classified
 
Outstanding at December 31, 2017
 
3,675,726

 
2,623,851

 
319,678

 
732,197

Granted
 
1,581,444

 
1,581,444

 
—

 
—

Exercised/Issued
 
(988,573
)
 
(968,148
)
 
—

 
(20,425
)
Cancelled
 
(198,313
)
 
(23,313
)
 
—

 
(175,000
)
Forfeited
 
(179,641
)
 
(179,641
)
 
—

 
—

Outstanding at December 31, 2018
 
3,890,643

 
3,034,193

 
319,678

 
536,772


(1)        Beginning balance includes 175,000 stock options issued outside of the 2013 Plan, which expired without being exercised in 2018.
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)
2018
 
1,581,444

 
$
10.35

 
26
2017
 
1,117,719

 
$
16.08

 
31
2016
 
1,754,868

 
$
10.85

 
34
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 years ended December 31, 2017 and 2016, as there were no RSUs containing market vesting conditions granted in 2018:
 
 
2017
 
2016
Weighted average expected term (years) (1)
 
3.00
 
3.00
Expected volatility (2)
 
52.1%
 
53.0%
Risk-free rate (3)
 
1.50%
 
1.05%
(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, 2018, the following equity classified RSUs were outstanding:
 
 
December 31, 2018
Vesting Conditions:
 
Outstanding
 
Weighted average remaining vesting period (months)
 
Potential additional awards
Service-based
 
1,002,085

 
6
 
—

Performance-based
 
1,482,846

 
18
 
1,351,323

Market-based
 
549,262

 
10
 
1,121,093

Total
 
3,034,193

 
13
 
2,472,416
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value The Company granted the following 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
2017
 
256,202

 
$
13.30

 
$
6.05

2016
 
390,198

 
$
8.05

 
$
4.35
Valuation Assumptions for Option Grants The following table provides the range of assumptions used in valuing stock options for the years ended December 31, 2017 and 2016, as there were no stock options granted in 2018:
 
 
Year Ended December 31,
 
 
2017
 
2016
Weighted average expected term (years) (1)
 
6.0
 
6.0
Expected volatility (2)
 
45.0%
 
53.0%
Risk-free rate (3)
 
2.09%
 
1.52% to 1.56%
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.