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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation

The Company’s stock-based compensation expense for the three and nine months ended September 30, 2016 and 2015 included PRSUs, non-qualified stock options, restricted stock units ("RSUs") and deferred stock units ("DSUs"). A summary of the Company’s stock-based compensation expense is presented in the following table.
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(in millions)
2016
 
2015
 
2016
 
2015
PRSU expense
$
1.8

 
$
3.0

 
$
6.0

 
$
10.4

Option expense
1.2

 
1.4

 
4.0

 
4.8

RSU/DSU expense
1.7

 
0.5

 
5.3

 
1.2

Total stock-based compensation expense
$
4.7

 
$
4.9

 
$
15.3

 
$
16.4



In the nine months ended September 30, 2016, the Company recorded $2.0 million of accelerated amortization associated with executive management transition. The Company recorded $0.9 million and $4.9 million of accelerated amortization associated with executive management transition for the three and nine months ended September 30, 2015.

The Company has 1.3 million PRSUs outstanding that will vest if the Company achieves more than $650 million of Adjusted earnings before interest, tax, depreciation and amortization ("EBITDA") for 2017 (the "2017 Aspirational Plan PRSUs"). All of the 2017 Aspirational Plan PRSUs will vest in full if the Company achieves Adjusted EBITDA in 2017 greater than $650 million. In addition, if this target is not met in 2017 but the Company achieves more than $650 million in Adjusted EBITDA for 2018, then one-third of the total 2017 Aspirational Plan PRSUs will vest, and the remaining 2017 Aspirational Plan PRSUs will be forfeited. If the Company does not achieve more than $650 million of Adjusted EBITDA in either 2017 or 2018, then all of the 2017 Aspirational Plan PRSUs will be forfeited. Adjusted EBITDA is defined as the Company’s "Consolidated EBITDA" as such term is defined in the Company’s 2012 Credit Agreement.

The Company did not record any stock-based compensation expense related to the 2017 Aspirational Plan PRSUs during the three or nine months ended September 30, 2016 or 2015, as it is not considered probable that the Company will achieve the specified performance target as of December 31, 2017 or December 31, 2018. The Company will continue to evaluate the probability of achieving the performance condition in future periods and record the appropriate expense if necessary. Based on the price of the Company’s common stock on the grant date, the total unrecognized compensation expense related to this award if the performance target is met for 2017 is $92.4 million, which would be expensed over the remaining service period if achieving the performance condition becomes probable.