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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Allocated Share-based Compensation Expense
During the three-month periods ended March 31, 2016 and 2015, the Company recognized the following stock-based compensation expense in direct operating expense and sales, general and administrative expense:
 
 
Three Months Ended March 31,
(Dollars in millions)
 
2016
 
2015
Stock options
 
$
0.4

 
$
0.5

Stock appreciation rights
 
0.4

 
—

Restricted stock units
 
4.7

 
1.2

Performance-based restricted stock units
 
1.6

 
0.6

Cash-settled performance-based restricted stock units
 
4.8

 
—

Total stock-based compensation expense
 
$
11.9

 
$
2.3
Share-based Compensation, Performance Shares Award Outstanding Activity
The following table summarizes cash-settled PRSU activity for the three-month period ended March 31, 2016:
 
Cash-settled Performance-based Restricted Stock Units
 
Number of Cash-settled Performance-based Restricted Stock Units
 
Weighted-Average Fair Value
 
 
 
 
Outstanding at December 31, 2015
—

 
$
—

Granted
2,486,912

 
22.92

Outstanding at March 31, 2016
2,486,912

 
$
30.70
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity Awards Outstanding and Exercisable
A summary of stock option award activity for the three-month period ended March 31, 2016 is presented below:  
 
 Stock Options
 
Number of Stock Options
 
Weighted-Average Exercise Price
 
Exercise Price Range
 
Weighted- Average Grant Date Fair Value
 
Weighted-Average Remaining Term
 
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2015
2,004,280

 
$
16.66

 
$2.68 - $31.88
 
$
6.06

 
4.57
Exercised
(97,565
)
 
19.91

 
$2.68 - $25.18
 
6.90

 
 
Forfeited or expired
(180,848
)
 
29.70

 
$27.69 - $29.79
 
1.53

 
 
Outstanding at March 31, 2016
1,725,867

 
$
15.11

 
$3.88 - $31.88
 
$
6.54

 
4.96
Options exercisable at March 31, 2016
1,408,612

 
$
14.76

 
$3.88 - $31.88
 
$
6.01

 
4.50
Schedule Of Estimated Remaining Share Based Compensation Expense
The remaining estimated compensation expense related to the existing stock options is as follows:
(Dollars in millions)
2016
 
2017
 
2018
 
2019
Remaining estimated compensation expense related to existing stock options
$
0.8

 
$
0.6

 
$
0.4

 
$
0.1
Stock appreciation rights  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity Awards Outstanding and Exercisable
The following table summarizes SAR activity for the three-month period ended March 31, 2016:
 
 Stock Appreciation Rights
 
Number of Rights
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Term
 
 
 
 
 
 
Outstanding at December 31, 2015
143,603

 
$
15.61

 
1.79
Exercised
(6,299
)
 
15.61

 
—
Outstanding at March 31, 2016
137,304

 
$
15.61

 
1.43
SARs exercisable at March 31, 2016
137,304

 
15.61

 
1.43
Restricted Stock Units and Performance-based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity Awards Outstanding and Exercisable
A summary of restricted stock units ("RSU") and performance-based restricted stock units ("PRSU") award activity for the three-month period ended March 31, 2016 is presented below:
 
Restricted Stock Units
 
Performance-based Restricted Stock Units
 
Number of Restricted Stock Units
 
Weighted-Average Grant Date Fair Value
 
Number of Performance-based Restricted
Stock Units
 
Weighted-Average Grant Date Fair Value
 
 
 
 
 
 
 
 
Outstanding at December 31, 2015
1,558,441

 
$
23.01

 
1,987,060

 
$
21.47

Granted
45,507

 
26.47

 
—

 
—

Vested
(95,220
)
 
30.17

 
(103,530
)
 
32.47

Forfeited
(79,816
)
 
26.02

 
(14,505
)
 
30.03

Outstanding at March 31, 2016
1,428,912

 
$
22.49

 
1,869,025

 
$
18.21
Schedule Of Estimated Remaining Share Based Compensation Expense
Remaining estimated compensation expense related to outstanding RSUs and PRSUs is as follows:
(Dollars in millions)
2016
 
2017
 
2018
 
2019
 
2020 and Thereafter
Remaining estimated compensation expense related to outstanding RSUs and PRSUs deemed probable
$
10.8

 
$
5.8

 
$
2.5

 
$
0.4

 
$
1.4
Cash-settled performance-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Estimated Remaining Share Based Compensation Expense
Remaining estimated compensation expense related to outstanding cash-settled PRSUs is as follows:
(Dollars in millions)
2016
 
2017
 
2018
 
2019
Remaining estimated compensation expense related to outstanding cash-settled PRSUs
$
14.3

 
$
19.1

 
$
19.1

 
$
19.1