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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Allocated Share-based Compensation Expense
During the three- and nine-month periods ended September 30, 2015 and 2014, the Company recognized the following stock-based compensation expense in sales, general and administrative expense:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Stock-based compensation expense
$
2.7

 
$
1.8

 
$
28.1

 
$
5.6
Stock Option  
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 nine-month period ended September 30, 2015 is presented below:  
 
 Stock Options
 
 
 
Weighted Average Exercise Price
 
 
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Term
 
Stock
 
 
Exercise
 
 
 
Options
 
 
Price Range
 
 
Outstanding at December 31, 2014
1,344,795

 
$
11.70

 
$2.68 - $27.87
 
$
6.04

 
6.84
Granted
—

 
—

 
N/A
 
—

 
 
Exercised
(52,683
)
 
9.22

 
$2.68 - $27.87
 
3.55

 
 
Forfeited
(36,300
)
 
20.11

 
$12.10 - $27.87
 
9.56

 
 
Outstanding at September 30, 2015
1,255,812

 
$
11.57

 
$2.68 - $27.87
 
$
5.57

 
6.20
Options exercisable at September 30, 2015
1,005,812

 
$
11.09

 
$2.68 - $27.87
 
$
5.29

 
6.09
Schedule Of Estimated Remaining Share Based Compensation Expense
The remaining estimated compensation expense related to the existing stock options for the periods ended December 31, 2015, 2016, 2017, 2018 and 2019 is as follows:
 
2015
 
2016
 
2017
 
2018
 
2019
Remaining estimated compensation expense related to existing stock options
$
0.3

 
$
1.1

 
$
0.5

 
$
0.3

 
$
0.1
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 nine-month period ended September 30, 2015 is presented below:  
 
Restricted Stock Units
 
Performance-based Restricted Stock Units
 
 
 
Weighted Average Grant Date Fair Value
 
Performance-based Restricted
Stock Units
 
Weighted Average Grant Date Fair Value
 
Restricted
 
 
 
 
Stock Units
 
 
 
Outstanding at December 31, 2014
692,823

 
$
15.23

 
1,563,951

 
$
20.86

Granted
35,413

 
39.42

 
291,770

 
29.32

Vested
(219,587
)
 
14.88

 
(79
)
 
27.61

Forfeited
(32,093
)
 
29.03

 
(3,418
)
 
28.47

Outstanding at September 30, 2015
476,556

 
$
16.31

 
1,852,224

 
$
22.19
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 RSUs and PRSUs for the years ending December 31, 2015, 2016, 2017, 2018, 2019, and 2020 and thereafter is as follows:
 
2015
 
2016
 
2017
 
2018
 
2019
 
2020 & thereafter
Remaining estimated compensation expense related to outstanding RSUs and PRSUs deemed probable
$
3.1

 
$
5.0

 
$
2.1

 
$
1.2

 
$
0.3

 
$
1.5